CSP total tree basal area without the snowbreak trees

Usage Rights

This data is Private.

Data is restricted in use to the Subprojects, in which the Phd students are, who did the work. Contact the principle investigator for usage permission.

Dataset Abstract

The BEF-China forest experiment studies the role of tree diversity in ecosystem functioning in subtropical forests. This data includes aggregated Basal area by Comparative Study Plots (CSP) in the Gutianshan National Nature Reserve. Basal area is calculated from data set "Tree size in the CSPs in 2008 and 2009" and it is calculated considering measurements on living trees after the snowbreak from 2008. Basal area estimation based on living trees and shrubs, using a linear model to predict missing dbh values based on living trees after the snowbreak 2008.

Spatial Extent

Data collection as explained in file SP01.CSP. Total basal area by CSP were calculated with "R", and records which had a comment of "dead" or "too small" were not included.
CSPs, Gutianshan National Nature Reserve
29°08'-29°17'N
118°02'-118°11'E

Temporal Extent

Data for these calculations were recorded between may and september 2008

Taxonomic Extent

Trees and shrubs Comparative Study Plots

Data Analysis

Basal area estimation based on living trees and shrubs, using a linear model to predict missing dbh values based on living trees after the snowbreak 2008. See the context "Measures on stem diameter distribution and basal area related to plot age in the CSPs" for a measure of basal area based on both living trees and those having been affected by the snowbreak in 2008. Basal area was calculated following: (pi/4)*(DBH^2). When DBH was missing, basal area (at breast height) was predicted from the basal ((pi/4)*(basal diameter^2) )area by a linear equation prediction: Basal area at breast height = 1.2527 + 0.4801*basal area. records with the comments "dead" and "too small" were excluded from the calculation. Separate values are given: basal area for shrubs (trees smaller than 10cm dbh) in the central plot (Basal area of shrubs in the CSPs was calculated by: CSPbha2008 - CSPbha10.2008). Basal area of trees in the cenral subplot of CSPs was calculated by: CSPbhaC.2008 - CSPbha.CSPbhaCS2008. Total Basal area of trees and shrubs in the CSPs was calculated by: CSPbha10.2008 + (9*(CSPbhaCS.2008))

Paper proposal submissions

Published

2013

Data columns available in the raw data part of this dataset

CSP
name of the CSP in the Nature ReserveBEF research plot nameReasearch plots of the Biodiversity - Ecosystem functioning experiment (BEF-China). There are three main sites for research plots in the BEF Experiment: Comparative Study Plots (CSP) in the Gutianshan Nature Reserve, having a size of 30x30m^2, measured on the ground.
Data group: BEF research plot name
Keywords: CSP
Values
CSP04
CSP01
CSP05
CSP03
CSP02
CSPbha2008
Basal area considering the individuals measured in the CSP. These are trees > 3cm bd in the central subplot and > 10cm in the outer subplots.
Unit: squaremeter
Data group: Basal area
Keywords: biomass, basal area
Values
0.823998472015179
0.200585485544249
0.576927803189697
0.894208957539313
0.280586264069781
CSPbha10.2008
Basal area of trees > 10 DBH in the CSPs
Unit: squaremeter
Data group: Basal area
Values
0.159726016083094
0.517749101279382
0.754669672312027
0.701139148317678
0.206456287889391
CSPbhaC.2008
Basal area of the trees and shrubs in the central subplot of each CSP
Unit: squaremeter
Data group: Basal area
Keywords: biomass, basal area
Values
0.0408594694611552
0.160712060433595
0.092441643079712
0.107265264959671
0.13824633920924
CSPbhaCS.2008
Basal area of the shrubs in the central subplot of each CSP
Unit: squaremeter
Data group: Basal area
Values
0.0184577147075368
0.0174950463248475
0.0103642249528799
0.00424104483591036
0.018394560013953
CSPbhaC10.2008
Basal area of the trees in the central subplot of each CSP
Unit: squaremeter
Data group: Basal area
Values
0.0331352887792811
0.0864064821540581
0.0897478801004162
0.00851121067108712
0.0435883571394601
CSPBhaT.2008
Estimated total basal area for the CSPs
Unit: squaremeter
Data group: Basal area
Keywords: biomass, basal area
Values
0.527461241233491
1.05035741847221
1.62920961614958
1.51628836765435
0.873626073512903