Data Package Metadata View Summary

Temperature differences in hardwood trees using thermal dissipation probes in Hubbard Brook Experimental Forest, NH and Bartlett Experimental Forest, NH

General Information

Data Package:
Local Identifier:	knb-lter-hbr.297.1
Title:	Temperature differences in hardwood trees using thermal dissipation probes in Hubbard Brook Experimental Forest, NH and Bartlett Experimental Forest, NH
Alternate Identifier:	DOI PLACE HOLDER
Abstract:	The MELNHE study looks at patterns of resource limitation through nutrient manipulations in three study sites in New Hampshire: Bartlett Experimental Forest, Hubbard Brook Experimental Forest, and Jeffers Brook, located in the White Mountain National Forest. The investigation is monitoring stem diameter, leaf area, sap flow, foliar chemistry, leaf litter production and chemistry, foliar nutrient resorption, root biomass and production, mycorrhizal associations, soil respiration, heterotrophic respiration, N and P availability, N mineralization, soil phosphatase activity, soil carbon and nitrogen, nutrient uptake capacity of roots, and mineral weathering. Applications of N and P began in June 2011 and continue at the rate of 30 kg N/ha/yr (as NH4NO3) and 10 kg P/ha/yr (as NaH2PO4). This dataset was produced using thermal dissipation probes in hardwood trees. We recorded temperature differences between the reference and heated over multiple days in five hardwood species across 5 years. Sites are located in Bartlett Experimental Forest and Hubbard Brook Experimental Forest in NH. The number of trees in each plot and species vary among years. These data were gathered as part of the Hubbard Brook Ecosystem Study (HBES). The HBES is a collaborative effort at the Hubbard Brook Experimental Forest, which is operated and maintained by the USDA Forest Service, Northern Research Station.
Publication Date:	2021-03-29

Time Period

Begin:

2013-06-24

End:

2017-08-04

People and Organizations
Contact:	Hubbard Brook Ecosystem Study [ email ]
Creator:	Rice, Alexandrea M (SUNY-ESF)
Creator:	Johnston, Mariann T (SUNY-ESF)
Creator:	Libenson, Arianna J (University of Vermont)

Data Entities
Data Table Name:	Temperature_Difference_Nutrient_Addition_Hardwood_Trees
Description:	Temperature differences in northern hardwood trees following nutrient additions of nitrogen, phosphorus, nitrogen and phosphorus, and calcium

Detailed Metadata

Data Entities

Data Table


Data:	https://pasta-s.lternet.edu/package/data/eml/knb-lter-hbr/297/1/0dfa38d0ec469267050ba95e3ad31a8a
Name:	Temperature_Difference_Nutrient_Addition_Hardwood_Trees
Description:	Temperature differences in northern hardwood trees following nutrient additions of nitrogen, phosphorus, nitrogen and phosphorus, and calcium
Number of Records:	22
Number of Columns:	6

Table Structure

Object Name:

SapFlux_2013_2018_BEF_HB_Organized.csv

Size:

1443 bytes

Authentication:

e0c155f84c44978e2df6730b03beb1e2 Calculated By MD5

Text Format:

Number of Header Lines:

Record Delimiter:

Orientation:

column

Simple Delimited:

Field Delimiter:	,
Quote Character:	"

Table Column Descriptions

Column Name:

Date_Time

Stand

Species

Treatment

Tree_ID

Temp_Diff

Definition:

Date and time

Tree stand name

Hardwood tree species

Nutrient addition plot

Individual tree identifier

Temperature difference between probes via thermal dissipation method

Storage Type:

date

string

float

Measurement Type:

dateTime

nominal

ratio

Measurement Values Domain:

Format	YYYY-MM-DD hh:mm:ss
Precision

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	C8
Definition	Bartlett Experiemental Forest mature aged stand clearcut around 1883
Source

Code Definition

Code	C6
Definition	Bartlett Experiemental Forest middle aged stand clearcut in 1975
Source

Code Definition

Code	HBM
Definition	Hubbard Brook Experimental Forest middle aged stand clearcut in 1971
Source

Code Definition

Code	HBO
Definition	Hubbard Brook Experimental Forest mature aged stand clearcut around 1910
Source

Code Definition

Code	JBO
Definition	Jeffers Brook mature aged forest stand clearcut around 1900
Source

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	American beech
Definition	American beech (Fagus grandifolia Ehrh.) tree species
Source

Code Definition

Code	red maple
Definition	red maple (Acer rubrum L.) tree species
Source

Code Definition

Code	sugar maple
Definition	sugar maple (Acer saccharum Marsh.) tree species
Source

Code Definition

Code	white birch
Definition	white birch (Betula papyrifera Marsh.) tree species
Source

Code Definition

Code	yellow birch
Definition	yellow birch (Betula alleghaniensis Britton) tree species
Source

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	Con
Definition	Control plot with no nutrient addition
Source

Code Definition

Code	N
Definition	Nitrogen nutrient addition plot
Source

Code Definition

Code	P
Definition	Phosphorus nutrient addition plot
Source

Code Definition

Code	NP
Definition	Nitrogen and Phosphorus nutrient addition plot
Source

Code Definition

Code	Ca
Definition	Calcium nutrient addition plot
Source

Definition

Individual tree identifier

Unit	celsius
Type	real
Min	0.501
Max	1.376

Missing Value Code:

Code	-999.999
Expl	Data not collected

Accuracy Report:

Accuracy Assessment:

Coverage:

Methods:

Data Package Usage Rights

This information is released under the Creative Commons license - Attribution - CC BY (https://creativecommons.org/licenses/by/4.0/). The consumer of these data ("Data User" herein) is required to cite it appropriately in any publication that results from its use. The Data User should realize that these data may be actively used by others for ongoing research and that coordination may be necessary to prevent duplicate publication. The Data User is urged to contact the authors of these data if any questions about methodology or results occur. Where appropriate, the Data User is encouraged to consider collaboration or co-authorship with the authors. The Data User should realize that misinterpretation of data may occur if used out of context of the original study. While substantial efforts are made to ensure the accuracy of data and associated documentation, complete accuracy of data sets cannot be guaranteed. All data are made available "as is." The Data User should be aware, however, that data are updated periodically and it is the responsibility of the Data User to check for new versions of the data. The data authors and the repository where these data were obtained shall not be liable for damages resulting from any use or misinterpretation of the data. Thank you.

Keywords

By Thesaurus:
LTER Controlled Vocabulary	ecosystems, forests, nutrient limitation
LTER Core Research Area	disturbance
HBES Vocabulary	Hubbard Brook Experimental Forest, HBEF Watershed 101, New Hampshire, NH, White Mountain National Forest, Bartlett Experimental Forest, sap flow, Acer rubrum, Acer saccharum, Betula papyrifera, Betula alleghaniensis, Fagus grandifolia, MELNHE, Multiple Element Limitation in Northern Hardwood Ecosystems
ISO 19115 Topic Category	biota
National Research & Development Taxonomy	Ecology, Ecosystems, & Environment

Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

Methods and protocols used in the collection of this data package

Description:

Hardwood trees without dead/decaying limbs within nutrient addition plots (N, P, N+P, Ca) were instrumented with thermal dissipation probes following Granier, 1987. Species instrumented included American beech, red maple, sugar maple, white birch, and yellow birch. The number of trees of each species monitored varied by stand and year ranging from 1 to 6. Temperature differences (֯C) were recorded every 15 minutes as an average of thirty 30-second readings for each tree. Trees were monitored for periods ranging from three days to one week in 2013, 2014, 2015, 2017, and 2018. These data were used in a project where they were converted to sap flux density.

People and Organizations

Publishers:

Organization:

Environmental Data Initiative

Email Address:

info@environmentaldatainitiative.org

Web Address:

https://environmentaldatainitiative.org

Creators:

Individual:

Alexandrea M Rice

Organization:

SUNY-ESF

Email Address:

arice01@syr.edu

Id:

https://orcid.org/0000-0002-2777-5469

Individual:

Mariann T Johnston

Organization:

SUNY-ESF

Email Address:

mjohnston@esf.edu

Individual:	Arianna J Libenson
Organization:	University of Vermont

Contacts:

Organization:

Hubbard Brook Ecosystem Study

Email Address:

hbr-im@lternet.edu

Temporal, Geographic and Taxonomic Coverage

Temporal, Geographic and/or Taxonomic information that applies to all data in this dataset:

Time Period

Begin:

2013-06-24

End:

2017-08-04

Geographic Region:

Description:

Hubbard Brook Experimental Forest

Bounding Coordinates:

Northern:	43.959	Southern:	43.914
Western:	-71.8062	Eastern:	-71.7022

Sampling Site:

Description:

Bartlett Experimental Forest

Site Coordinates:

Longitude (degree):

-71.2973

Latitude (degree):

44.0556

Taxonomic Range:

Classification:

Rank Name:

kingdom

Rank Value:

Plantae

Common Name:

plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 202422 (Plantae)

Classification:

Rank Name:

subkingdom

Rank Value:

Viridiplantae

Common Name:

green plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 954898 (Viridiplantae)

Classification:

Rank Name:

infrakingdom

Rank Value:

Streptophyta

Common Name:

land plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846494 (Streptophyta)

Classification:

Rank Name:

superdivision

Rank Value:

Embryophyta

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 954900 (Embryophyta)

Classification:

Rank Name:

division

Rank Value:

Tracheophyta

Common Name:

vascular plants

Common Name:

tracheophytes

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846496 (Tracheophyta)

Classification:

Rank Name:

subdivision

Rank Value:

Spermatophytina

Common Name:

spermatophytes

Common Name:

seed plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846504 (Spermatophytina)

Classification:

Rank Name:

class

Rank Value:

Magnoliopsida

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 18063 (Magnoliopsida)

Classification:

Rank Name:

superorder

Rank Value:

Rosanae

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846548 (Rosanae)

Classification:

Rank Name:

order

Rank Value:

Fagales

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 19273 (Fagales)

Classification:

Rank Name:

family

Rank Value:

Fagaceae

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 19275 (Fagaceae)

Classification:

Rank Name:

genus

Rank Value:

Fagus

Common Name:

beech

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 19461 (Fagus)

Classification:

Rank Name:	species
Rank Value:	Fagus grandifolia
Common Name:	American beech
Identifer:	Integrated Taxonomic Information Service (ITIS) Info for ID: 19462 (Fagus grandifolia)

Classification:

Rank Name:

kingdom

Rank Value:

Plantae

Common Name:

plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 202422 (Plantae)

Classification:

Rank Name:

subkingdom

Rank Value:

Viridiplantae

Common Name:

green plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 954898 (Viridiplantae)

Classification:

Rank Name:

infrakingdom

Rank Value:

Streptophyta

Common Name:

land plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846494 (Streptophyta)

Classification:

Rank Name:

superdivision

Rank Value:

Embryophyta

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 954900 (Embryophyta)

Classification:

Rank Name:

division

Rank Value:

Tracheophyta

Common Name:

vascular plants

Common Name:

tracheophytes

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846496 (Tracheophyta)

Classification:

Rank Name:

subdivision

Rank Value:

Spermatophytina

Common Name:

spermatophytes

Common Name:

seed plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846504 (Spermatophytina)

Classification:

Rank Name:

class

Rank Value:

Magnoliopsida

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 18063 (Magnoliopsida)

Classification:

Rank Name:

superorder

Rank Value:

Rosanae

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846548 (Rosanae)

Classification:

Rank Name:

order

Rank Value:

Sapindales

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 28643 (Sapindales)

Classification:

Rank Name:

family

Rank Value:

Sapindaceae

Common Name:

soapberries

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 28657 (Sapindaceae)

Classification:

Rank Name:

genus

Rank Value:

Acer

Common Name:

maples

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 28727 (Acer)

Classification:

Rank Name:	species
Rank Value:	Acer rubrum
Common Name:	red maple
Identifer:	Integrated Taxonomic Information Service (ITIS) Info for ID: 28728 (Acer rubrum)

Classification:

Rank Name:

kingdom

Rank Value:

Plantae

Common Name:

plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 202422 (Plantae)

Classification:

Rank Name:

subkingdom

Rank Value:

Viridiplantae

Common Name:

green plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 954898 (Viridiplantae)

Classification:

Rank Name:

infrakingdom

Rank Value:

Streptophyta

Common Name:

land plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846494 (Streptophyta)

Classification:

Rank Name:

superdivision

Rank Value:

Embryophyta

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 954900 (Embryophyta)

Classification:

Rank Name:

division

Rank Value:

Tracheophyta

Common Name:

vascular plants

Common Name:

tracheophytes

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846496 (Tracheophyta)

Classification:

Rank Name:

subdivision

Rank Value:

Spermatophytina

Common Name:

spermatophytes

Common Name:

seed plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846504 (Spermatophytina)

Classification:

Rank Name:

class

Rank Value:

Magnoliopsida

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 18063 (Magnoliopsida)

Classification:

Rank Name:

superorder

Rank Value:

Rosanae

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846548 (Rosanae)

Classification:

Rank Name:

order

Rank Value:

Sapindales

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 28643 (Sapindales)

Classification:

Rank Name:

family

Rank Value:

Sapindaceae

Common Name:

soapberries

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 28657 (Sapindaceae)

Classification:

Rank Name:

genus

Rank Value:

Acer

Common Name:

maples

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 28727 (Acer)

Classification:

Rank Name:	species
Rank Value:	Acer saccharum
Common Name:	sugar maple
Identifer:	Integrated Taxonomic Information Service (ITIS) Info for ID: 28731 (Acer saccharum)

Classification:

Rank Name:

kingdom

Rank Value:

Plantae

Common Name:

plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 202422 (Plantae)

Classification:

Rank Name:

subkingdom

Rank Value:

Viridiplantae

Common Name:

green plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 954898 (Viridiplantae)

Classification:

Rank Name:

infrakingdom

Rank Value:

Streptophyta

Common Name:

land plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846494 (Streptophyta)

Classification:

Rank Name:

superdivision

Rank Value:

Embryophyta

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 954900 (Embryophyta)

Classification:

Rank Name:

division

Rank Value:

Tracheophyta

Common Name:

vascular plants

Common Name:

tracheophytes

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846496 (Tracheophyta)

Classification:

Rank Name:

subdivision

Rank Value:

Spermatophytina

Common Name:

spermatophytes

Common Name:

seed plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846504 (Spermatophytina)

Classification:

Rank Name:

class

Rank Value:

Magnoliopsida

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 18063 (Magnoliopsida)

Classification:

Rank Name:

superorder

Rank Value:

Rosanae

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846548 (Rosanae)

Classification:

Rank Name:

order

Rank Value:

Fagales

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 19273 (Fagales)

Classification:

Rank Name:

family

Rank Value:

Betulaceae

Common Name:

alder

Common Name:

birch

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 19465 (Betulaceae)

Classification:

Rank Name:

genus

Rank Value:

Betula

Common Name:

birch

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 19478 (Betula)

Classification:

Rank Name:	species
Rank Value:	Betula papyrifera
Common Name:	paper birch
Identifer:	Integrated Taxonomic Information Service (ITIS) Info for ID: 19489 (Betula papyrifera)

Classification:

Rank Name:

kingdom

Rank Value:

Plantae

Common Name:

plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 202422 (Plantae)

Classification:

Rank Name:

subkingdom

Rank Value:

Viridiplantae

Common Name:

green plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 954898 (Viridiplantae)

Classification:

Rank Name:

infrakingdom

Rank Value:

Streptophyta

Common Name:

land plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846494 (Streptophyta)

Classification:

Rank Name:

superdivision

Rank Value:

Embryophyta

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 954900 (Embryophyta)

Classification:

Rank Name:

division

Rank Value:

Tracheophyta

Common Name:

vascular plants

Common Name:

tracheophytes

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846496 (Tracheophyta)

Classification:

Rank Name:

subdivision

Rank Value:

Spermatophytina

Common Name:

spermatophytes

Common Name:

seed plants

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846504 (Spermatophytina)

Classification:

Rank Name:

class

Rank Value:

Magnoliopsida

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 18063 (Magnoliopsida)

Classification:

Rank Name:

superorder

Rank Value:

Rosanae

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 846548 (Rosanae)

Classification:

Rank Name:

order

Rank Value:

Fagales

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 19273 (Fagales)

Classification:

Rank Name:

family

Rank Value:

Betulaceae

Common Name:

alder

Common Name:

birch

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 19465 (Betulaceae)

Classification:

Rank Name:

genus

Rank Value:

Betula

Common Name:

birch

Identifer:

Integrated Taxonomic Information Service (ITIS)
Info for ID: 19478 (Betula)

Classification:

Rank Name:	species
Rank Value:	Betula alleghaniensis
Common Name:	yellow birch
Identifer:	Integrated Taxonomic Information Service (ITIS) Info for ID: 19481 (Betula alleghaniensis)

Project

Parent Project Information:

Title:

Soil Nutrient Limitation of Northern Hardwood Forest Producticity: Mechanisms Contributing

Personnel:

Individual:

Alexandrea M Rice

Organization:

SUNY-ESF

Email Address:

arice01@syr.edu

Id:

https://orcid.org/0000-0002-2777-5469

Role:

Principal Investigator

Funding:

USDA National Institute of Food and Agriculture 2019-67019-29464

Related Project:

Title:

Collaborative Research: Nutrient co-limitation in young and mature northern hardwood forests

Personnel:

Individual:

Ruth D Yanai

Organization:

SUNY-ESF

Email Address:

rdyanai@syr.edu

Id:

https://orcid.org/0000-0001-6987-2489

Role:

Principal Investigator

Funding:

National Science Foundation DEB-0949324

Related Project:

Title:

Long-Term Ecological Research at Hubbard Brook Experimental Forest (2010)

Personnel:

Individual:

Timothy Fahey

Organization:

Cornell University

Email Address:

tjf5@cornell.edu

Id:

https://orcid.org/0000-0003-1283-1162

Role:

Principal Investigator

Funding:

National Science Foundation (NSF) 1114804

Related Project:

Title:

LTER: Long Term Ecological Research at the Hubbard Brook Experimental Forest (2016)

Personnel:

Individual:

Gary Lovett

Organization:

Cary Institute of Ecosystem Studies

Email Address:

lovettg@caryinstitute.org

Id:

https://orcid.org/0000-0002-8411-8027

Role:

Principal Investigator

Funding:

National Science Foundation (NSF) 1637685

Related Project:

Title:

Long-Term Ecological Research at the Hubbard Brook Experimental Forest (2016)

Personnel:

Individual:

Gary Lovett

Organization:

Cary Institute of Ecosystem Studies

Email Address:

lovettg@caryinstitute.org

Id:

https://orcid.org/0000-0002-8411-8027

Role:

Principal Investigator

Funding:

National Science Foundation (NSF) 1633026

Maintenance

Maintenance:

Description:	Complete
Frequency:

Other Metadata

Copyright 2024 Environmental Data Initiative. This material is based upon work supported by the National Science Foundation under grants #2223103 and #2223104. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. Please contact us with questions, comments, or for technical assistance regarding this web site or the Environmental Data Initiative. Please read our privacy policy to know what information we collect about you and to understand your privacy rights.

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Data Package Metadata View Summary

Temperature differences in hardwood trees using thermal dissipation probes in Hubbard Brook Experimental Forest, NH and Bartlett Experimental Forest, NH

Data Entities

Data Table

Data Package Usage Rights

Keywords

Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

People and Organizations

Temporal, Geographic and Taxonomic Coverage

Project

Parent Project Information:

Maintenance

Recently Added

Recently Updated

Data Package Metadata View Summary

Temperature differences in hardwood trees using thermal dissipation probes in Hubbard Brook Experimental Forest, NH and Bartlett Experimental Forest, NH

+/- Data Entities

Data Table

+/- Data Package Usage Rights

+/- Keywords

+/- Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

+/- People and Organizations

+/- Temporal, Geographic and Taxonomic Coverage

+/- Project

Parent Project Information:

+/- Maintenance

Data Entities

Data Package Usage Rights

Keywords

Methods and Protocols

People and Organizations

Temporal, Geographic and Taxonomic Coverage

Project

Maintenance