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《Journal of Northwest A & F University(Natural Science Edition)》 2019-01
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Determination of minimum sampling area for natural forest investigation in Xiaolongshan forest region

YUAN Yichao;LI Chunlan;ZHAO Zhonghua;LIU Wenzhen;WAN Pan;Xiaolongshan Research Institute of Forestry of Gansu Province;Key Laboratory of Secondary Forest Cultivation of Gansu Province;Research Institute of Forestry,Chinese Academy of Forestry;  
【Objective】This study determined the minimum plot area needed for evaluating natural forest characteristics by analyzing the relationship between forest structure parameter and plot area to provide basis for ecological monitoring and forest management.【Method】This study focused on natural forest in Xiaolongshan forest region and three 1hm2 permanent plots were selected to set plots with areas of 10m×10m,20m×20m,…,90m×90musing the nested sampling method.The relationships of plot area withtrees species,Shannon-Wiener index,mingling,stem-number,basal area and uniform angle index were investigated,respectively.The logarithmic model,power function model and logistic model were used to fit tree species with plot area and Shannon-Wiener index with plot area.【Result】The tree species,diversity and plot area increased dramatically at the early stage and tended to stable later with peaks at plot areas of1 600m2 and 2 500m2.The logistic model had the best fitting for species with plot area and Shannon-Wiener index with plot area.When the plot area was 1 600m2,the error between estimated and measured values of trees per hectare was less than 10%.When the areas of plots 1and 2were 1 600m2 and the area of plot 3was 2 500m2,the error between estimated and measured values of basal area hectare was less than10%.The analysis of mingling indicated that the frequency distribution of mingling had no regularity with very small plot area.The average mingling became stable when the plot areas of three plots were 1 600m2,2 500m2,and 900m2.The analysis of uniform angle index indicated that average uniform angle index of plot 1was aggregated with different plot areas,but it varied greatly when plot area was less than 2 500m2.The average uniform angle index value of plot 2was aggregated and tended to be stable when sampling area was larger than 900m2,while the average uniform angle index of plot 3was random and tended to be stable when plot area was larger than 2 500m2.【Conclusion】When the plot area was larger than 2 500m2,all stand parameters tended to be stable.Therefore,the minimum sampling area for analyzing characteristics of natural forest in Xiaolongshan forest region was 2 500m2.
【Fund】: 国家自然科学基金项目“基于相邻木关系的林分结构多样性研究”(31670640)
【CateGory Index】: S757
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