Data Package Metadata View Summary

Community Response to Removals of Plant functional Groups and Species on the Jornada Basin LTER, 1997-2002

General Information

Data Package:
Local Identifier:	knb-lter-jrn.210121001.56
Title:	Community Response to Removals of Plant functional Groups and Species on the Jornada Basin LTER, 1997-2002
Alternate Identifier:	DOI PLACE HOLDER
Abstract:	Arid and semi‐arid ecosystems often exhibit diverse plant growth forms in water‐limited environments, but it is unclear whether resource competition (interference) is actually important in structuring communities. We chose a diverse Chihuahuan desert shrubland to examine the response of the plant community to experimental removals of selected perennial plant species or groups of species. Four treatments involved the removal of all individuals of all species of a single functional group (functional group removals: shrub removal, succulent removal, subshrub removal, perennial grass removal). Three other treatments involved removing species within functional groups. These seven treatments plus a control (no plants removed) were replicated six times each in 25×25 m experimental plots, in summer 1995. Permanent belt transects were surveyed for number and sizes of all vascular plants in spring and fall in 1997, 1999, 2000, and 2001. Those plots from which the dominant shrub, Larrea tridentata, was removed had not recovered in total plant cover or volume by 2001, but cover and volume in all other treatments were similar to those in control plots. Relatively few species demonstrated a positive response to the removal of other species or functional groups. The perennial grass group and forbs were the most responsive; perennial grass cover increased in the shrub removal treatment relative to the control but treatment differences diminished after dry growing seasons in 2000 and 2001. Results over the first five years suggest that either environmental conditions or intrinsic biological characteristics limit the ability of most plant species to respond to the removal of substantial fractions of community biomass and composition in the short term. Such slow response by both dominant and less abundant components of the community has implications for the recovery of semi‐arid systems after human disturbance or other events leading to the reduction of biological diversity. This study is complete. For more information, see: Buonopane, M., Huenneke L., and Remmenga, M. 2005. Community reponses to removals of plant functional groups and species from a Chihuahuan Desert shrubland. Oikos 110:67-80.
Short Name:	Functional
Publication Date:	2019-07-18
Language:	English

Time Period

Begin:

1997-05-19

End:

2002-09-26

People and Organizations
Contact:	Manager, Data (datamanager.jrn.lter@gmail.com)
Creator:	Huenneke, Laura (Jornada Basin LTER)

Data Entities
Data Table Name:	data_JornadaStudy_121_biodiversity_vegetation_transect
Description:	Community response to removals of plant functional groups and species on the Jornada Experimental Range, 1997-2002

Detailed Metadata

Data Entities

Data Table

Data:

https://pasta-s.lternet.edu/package/data/eml/knb-lter-jrn/210121001/56/9e051f9ca6891349d14c74a2700b1f45

Name:

data_JornadaStudy_121_biodiversity_vegetation_transect

Description:

Community response to removals of plant functional groups and species on the Jornada Experimental Range, 1997-2002

Number of Columns:

Time Period

Begin:

1997-05-19

End:

2002-09-26

Table Structure

Object Name:

JornadaStudy_121_biodiversity_plots_vegetation_transect_data.csv

Size:

15841135

Text Format:

Number of Header Lines:

Number of Foot Lines:

Record Delimiter:

\r\n

Orientation:

column

Simple Delimited:

Field Delimiter:	,
Quote Character:	"

Table Column Descriptions

date

plot

treatment

transect

quad

species

diameter 1

diameter 2

vertical height

condition

count

notes

error code

original record sequence number

Column Name:

date

plot

treatment

transect

quad

spp

diam1

diam2

height

condition

count

notes

org_rsn

Definition:

month/day/year

plot number (values from 1-100; there are 48 plots)

treatment

Transect number, west to east

Quadrat number (usually recorded as 15-1, north to south)

plant species i.d. See LTER plant species list for codes.

maximum diameter, in cm

maximum diameter perpendicular to first diameter, in cm

vertical height, in cm

condition (live or dead)

number of similar size occurrences

Vtm##syy.ini where VT=vegetation transect m=(B)ook or (T)ape media ##=book or tape number s=season (F=fall; S=spring) yy=year (if 95-99, add 1900) (if 00-94, add 2000) ini=observer initials

error code-0 or 1

original record sequence number

Storage Type:

date

string

Measurement Type:

dateTime

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

Measurement Values Domain:

Format	mm/dd/yyyy
Precision

Unit	N/A
Precision	1
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	C
Definition	control
Source

Code Definition

Code	S
Definition	shrub removal
Source

Code Definition

Code	PG
Definition	perennial grass removal
Source

Code Definition

Code	SSh
Definition	subshrub removal
Source

Code Definition

Code	Succ
Definition	succulent removal
Source

Code Definition

Code	Simp
Definition	simplified
Source

Code Definition

Code	rL
Definition	reduced minus Larrea
Source

Code Definition

Code	rP
Definition	reduced minus Posopis
Source

Unit	N/A
Precision	1
Type	real

Unit	N/A
Precision	1
Type	real
Min	1
Max	15

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	*
Definition	See Jornada LTER Plant Species List @ https://jornada.nmsu.edu/jornada/species/lter-plants
Source

Unit	cm1
Precision	1
Type	real

Unit	cm
Precision	1
Type	real

Unit	cm
Precision	1
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	L
Definition	live
Source

Code Definition

Code	D
Definition	dead
Source

Unit	N/A
Precision	1
Type	real

Definition

Vtm##syy.ini where VT=vegetation transect m=(B)ook or (T)ape media ##=book or tape number s=season (F=fall; S=spring) yy=year (if 95-99, add 1900) (if 00-94, add 2000) ini=observer initials

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	0
Definition	none
Source

Code Definition

Code	1
Definition	see history log entry
Source

Definition

original record sequence number

Missing Value Code:

Accuracy Report:

Accuracy Assessment:

Coverage:

Methods:

Data Package Usage Rights

Data Policies

This data package is released to the “public domain” under Creative Commons CC0 1.0 “No Rights Reserved” (see: https://creativecommons.org/publicdomain/zero/1.0/). It is considered professional etiquette to provide attribution of the original work if this data package is shared in whole or by individual components. A generic citation is provided for this data package on the website https://portal.edirepository.org (herein “website”) in the summary metadata page. Communication (and collaboration) with the creators of this data package is recommended to prevent duplicate research or publication. This data package (and its components) is made available “as is” and with no warranty of accuracy or fitness for use. The creators of this data package and the website shall not be liable for any damages resulting from misinterpretation or misuse of the data package or its components. Periodic updates of this data package may be available from the website. Thank you.

Keywords

By Thesaurus:
LTER Core Area	Populations
Jornada Dataset Keywords	Vegetation Dynamics, non-core
LTER Controlled Vocabulary	communities, vegetation, species
keywords	functional

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:

field data sheets; tape recorder (varied by day and observer)

Description:

A 250×150 m area was located on the slope and gridded into 25×25 m plots. Plots containing conspicuous drainage channels were eliminated from use in the experiment. Remaining plots were evaluated by the use of two diagonal line – intercept transects run through each, along which the cover of specific shrub and succulent species (and of bare ground or openings) was recorded to the nearest cm. These preliminary data did not reveal any gradient from west to east (along the slope) in total vegetative cover or in the relative abundance of particular woody species. However, a gradient from south to north in P. glandulosa abundance was detected. Due to this spatial pattern in vegetative composition, and probable environmental gradients from upslope to down, we chose to use a randomized complete block design with 48 plots (8 treatments×6 blocks). Treatments were established by the selective removal of plant species or of all species of a functional group within a plot. There are eight treatments: a control (C, no removals); four functional group removal treatments (PG, perennial grass removed; S, shrubs removed; SSh, subshrubs removed; Succ, succulents removed), and three treatments where richness within a functional group was manipulated.The latter include the simplified treatment (Simp, where only the single most abundant species of each growth form remains, while all other species of those growth forms are removed), the reduced‐Larrea treatment (rL, where the dominant of each growth form is removed, and minority components remain), and a second form of the reduced treatment (rP, where Prosopis rather than Larrea is removed as the shrub dominant). We established treatments in summer/fall 1995. Plants were removed by cutting at the soil surface (no soil disturbance or herbicide application). Within each treatment, all plants removed from at least one plot were both field weighed and oven dried to constant weight. These data were used to construct regressions of dry weight versus live biomass weight. In the remaining plots of each treatment, removed plants were weighed in the field by species. Cumulative live mass totals for each species in each plot were used in the regressions to calculate the amount of dry mass removed. Dead material from shrubs and subshrubs was removed and weighed separately; this material was regarded as dry matter and no regression was used.

Quality Control
Quality Control Step 1:

Description:

SAS programs were used for quality assurance and statistical analysis.

People and Organizations

Publishers:

Organization:

Jornada Basin LTER

Web Address:

http://jornada.nmsu.edu/lter

Creators:

Individual:	Laura Huenneke
Organization:	Jornada Basin LTER

Contacts:

Individual:	Data Manager
Organization:	datamanager.jrn.lter@gmail.com

Temporal, Geographic and Taxonomic Coverage

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

Time Period

Begin:

1997-05-19

End:

2002-09-26

Geographic Region:

Description:

Our study site is located in the northern Chihuahuan Desert, approximately 25 km northeast of Las Cruces, New Mexico, USA (+32.6 N, -106.7 W, elevation 1315 m). Annual precipitation is 24 cm and maximum temperatures average 13 C in January and 36 C in June. Our study site includes the 78,000 ha Jornada Experimental Range operated by the USDA Agricultural Research Service (http://jornada.nmsu.edu/), and the 22,000 ha Chihuahuan Desert Rangeland Research Center (CDRRC, http://chihuahuansc.nmsu.edu/) operated by New Mexico State University (http://www.nmsu.edu/).

Bounding Coordinates:

Northern:	32.7494871013	Southern:	32.4731725883
Western:	-106.87288312	Eastern:	-106.692716261
Altitude (meter):	1315

Temporal, Geographic and/or Taxonomic information that applies to Data Table: data_JornadaStudy_121_biodiversity_vegetation_transect

Time Period

Begin:

1997-05-19

End:

2002-09-26

Project

Maintenance

Maintenance:

Description:	Every fall (1 x per year) was minimum during the duration of the study. When resources permit and vegetation seems to deserve it, spring sampling was also carried out (2 x per year). This study is complete.
Frequency:

Additional Info


Additional Information:
	The Plant Diversity Experiment: The experimental area is a 250 m x 250 m area located on the NMSU Chihuahuan Desert Rangeland Research Center, immediately northeast of the intersection of the Summerford powerline road and the road running along the southern boundary of the Jornada Experimental Range and the CDRRC. The area was gridded into 25 m x 25 m plots; because of some existing environmental gradients (the area slopes to the east, and mesquite abundance varies from north to south) blocks were established and treatments were randomly assigned to plots within blocks. A 15 m x 15 m study plot with a 5 m buffer area around it was established within each 25 m x 25 m plot. Plots are oriented north-south with the west side paralleling the powerline road. There are 3 parallel, 1 m x 15 m transects per plot. Each transect is divided into 15 1-m2 quadrats. The southwest corner of Transect 1 begins at the southwest corner of the 15 m x 15 m study plot and extends north. The southwest corner of Transect 2 begins 5 meters from the southwest corner of Transect 1 along the south boundary of the 15 m x 15 m plot and extends north. The southwest corner of Transect 3 begins 10 meters from the southwest corner of Transect 1 along the south boundary of the 15 m x 15 m plot and also extends north. The transects run perpendicular to the bajada slope.

Other Metadata

Additional Metadata

additionalMetadata
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        |     |     |___text '\n        '
        |     |     |___element 'unit' in ns 'http://www.xml-cml.org/schema/stmml-1.1' ('stmml:unit')
        |     |     |     |  \___attribute 'id' = 'N/A'
        |     |     |     |___text '\n          '
        |     |     |     |___element 'description' in ns 'http://www.xml-cml.org/schema/stmml-1.1' ('stmml:description')
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        |     |     |     |  \___attribute 'id' = 'cm1'
        |     |     |     |___text '\n          '
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        |     |     |___element 'unit' in ns 'http://www.xml-cml.org/schema/stmml-1.1' ('stmml:unit')
        |     |     |     |  \___attribute 'id' = 'cm'
        |     |     |     |___text '\n          '
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        |     |     |     |___text '\n        '
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        |     |___text '\n    '
        |___text '\n  '

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Data Package Metadata View Summary

Community Response to Removals of Plant functional Groups and Species on the Jornada Basin LTER, 1997-2002

Data Entities

Data Table

Data Package Usage Rights

Data Policies

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

Temporal, Geographic and/or Taxonomic information that applies to Data Table: data_JornadaStudy_121_biodiversity_vegetation_transect

Project

Maintenance

Additional Info

Additional Metadata

Recently Added

Recently Updated

Data Package Metadata View Summary

Community Response to Removals of Plant functional Groups and Species on the Jornada Basin LTER, 1997-2002

+/- Data Entities

Data Table

+/- Data Package Usage Rights

Data Policies

+/- 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

Temporal, Geographic and/or Taxonomic information that applies to Data Table: data_JornadaStudy_121_biodiversity_vegetation_transect

+/- Project

+/- Maintenance

+/- Additional Info

+/- Additional Metadata

Data Entities

Data Package Usage Rights

Keywords

Methods and Protocols

People and Organizations

Temporal, Geographic and Taxonomic Coverage

Project

Maintenance

Additional Info

Additional Metadata