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This package includes tree growth-ring widths for increment cores collected from a long-term 'macroplot' established in old-growth hemlock-northern hardwoods forest at the Huron Mts. of northern MI. Tree demographic monitoring data for the entire ca. 3.0 ha macroplot are available in the EDI package edi.1416.1. In 1994 and 1995, increment cores were taken for all 'core-able' trees greater than ~ 10 cm diameter for a subsection of the macroplot about 1 ha in area, along with some additional Tsuga canadensis trees beyond that 1 ha section. Cores are NOT cross-dated. See Methods for more details. This data-package may be cross-referenced to the demographic data in edi.1416.1 using stem numbers.
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.
Field Methods: Over an approximately 1-ha portion of the macroplot described in package edi.1416.1, all suitable trees > 10 cm in diameter were cored in the summers of 1994 and 1995. Trees that were obviously substantially hollow or rotten, leaning heavily, or otherwise significantly compromised were skipped. A single core was taken at a height of about 1.2 m, from north to south (except as otherwise noted in the 'field notes' field of the core information data-table). Where rot or hollowness prevented taking a complete core, only the 'south-facing' section is included (indicated by "a" in the 'side' code in data-set). Where a single complete core (bark to bark) could be extracted, both sides ("a" and 'north-facing' "b" side) are included. In addition to ca. 200 cores taken from a contiguous section of the macroplot, another ca. 25 cores were collected for Tsuga canadensis from another section of the macroplot.
Lab Methods: Cores were mounted on wooden blocks. Rings were measured, in the ecology lab at Bennington College, for all cores during 1994-1997, using "Project J2X" software and a Velmex ring measurement system. Cross-dating proved to be impractical, and data in this package are raw measurements (not cross-dated). Maximum ring-count was 312.
Tree index codes in this data-set correspond to those in edi.1416.1
Maintenance by dataset author; dataset will be updated as warranted
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