Forest Stability Evaluation Based on Mathematical Expectations—A Case Study in Jiangshan,Zhejiang Province

doi:10.13466/j.cnki.lyzygl.2019.05.022

Abstract

Abstract:

Forest stability is a comprehensive feature of forest community structure and function,which determines the ecological function of forest.Two quantitative indicators,namely mathematical expectation of stand duration and mathematical expectation of tree duration,were proposed to measure forest stability in this study from a new perspective.Mathematical expectation of stand duration is the expected number of years that stand can exist after growing into forests.The mathematical expectation of tree duration is the number of years that trees can survive after growing up to standard for starting measure the DBH(5cm).The mathematical expectation of the duration of stand and tree for different forest categories in Jiangshan City was studied based on the data of sample plots of arbor forests in 2008 and 2016.The stand and tree stability of Jiangshan forest under the current management model are quantitatively evaluated by two sets of mathematical expectations.The results show that:1) the mathematical expectation of the stand duration of non-commercial forest in Jiangshan City is 41.46 a and that of commercial forest is 14.16 a when the cutting loss rate of forest > 50% regarded as interruption.The mathematical expectation of the stand duration of non-commercial forest is 95.64 a and that of commercial forest 34.89 a,when the cutting loss rate of forest stands > 50% but the standard of arbor forest is maintained regarded as uninterrupted.2) the mathematical expectation of the tree survival period of non-commercial forest is 20.58 a and that of commercial forest is 11.67 a.Regardless of the mathematical expectation of stand duration or the mathematical expectation of tree survival period,the mathematical expectation of non-commercial forest is significantly greater than that of commercial forest,that is,the stability of non-commercial forest is greater than that of commercial forest,which accords with the actual situation and operational expectation.It shows that the method of evaluating forest stability by using mathematical expectation of stand duration and mathematical expectation of tree survival period is feasible.

Key words: forest stability, forest category, mathematical expectation of stand duration, mathematical expectation of tree survival period, permanent sample plot

CLC Number:

S757.4
S711

YING Baogen, LIAO Wenhai, YAO Rentu, GE Hongli. Forest Stability Evaluation Based on Mathematical Expectations—A Case Study in Jiangshan,Zhejiang Province[J]. FOREST RESOURCES WANAGEMENT, 2019, (5): 145-149.

Figures/Tables 3

References 31

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森林类别	前期样地数/个	后期样地数/个	复查期林分保存率	年度林分保存率	数学期望/a
公益林	62	51	0.8226	0.9759	41.46
商品林	106	59	0.5566	0.9294	14.16

森林类别	前期样地数/个	后期样地数/个	复查期林分保存率	年度林分保存率	数学期望/a
公益林	62	57	0.9194	0.9895	95.64
商品林	106	84	0.7925	0.9713	34.89

森林类别	前期样木数/株	后期样木数/株	复查期林木保存率	年度林木保存率	数学期望/a
公益林	8042	5399	0.6714	0.9514	20.58
商品林	12939	6317	0.4882	0.9143	11.67