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Forest and Grassland Resources Research >

2019 , Vol. 0 >Issue 5: 145 - 149

DOI: https://doi.org/10.13466/j.cnki.lyzygl.2019.05.022

Research Bulletin

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

  • Baogen YING ,
  • Wenhai LIAO ,
  • Rentu YAO ,
  • Hongli GE
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  • 1. Zhejiang Public Welfare Forest and State-owned Forest Farm Management Station,Hangzhou 310020,China
    2. Forestry Bureau of Jiangshan County,Jiangshan 324100,China
    3. School of Environmental and Resource Science,Zhejiang A&F University,Lin'an 311300,China
    4. State Key Laboratory of Subtropical Silviculture,Lin'an 311300,China

Received date: 2019-06-24

  Revised date: 2019-09-18

  Online published: 2020-09-18

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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

Cite this article

Baogen YING , Wenhai LIAO , Rentu YAO , Hongli GE . Forest Stability Evaluation Based on Mathematical Expectations—A Case Study in Jiangshan,Zhejiang Province[J]. Forest and Grassland Resources Research, 2019 , 0(5) : 145 -149 . DOI: 10.13466/j.cnki.lyzygl.2019.05.022

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