Effect of thinning intensity on understory herbaceous diversity and biomass in mixed coniferous and broad-leaved forests of Changbai Mountain  

作　　者：Gerong Wang Yue Sun Mo Zhou Naiqian Guan Yuwen Wang Runhua Jiang Zhiyu Liu Mengjia Wu Fucai Xia 

机构地区：[1]Key Laboratory of State Forestry Administration on Conservation and Efficient Utilization of Precious and Rare Forest Resource in Changbai Mountain,Forestry College,Beihua University,132013 Jilin,China [2]West Campus of Hebei Agricultural University,2596 Lekai South Street,Lianchi District,071000 Baoding,China

出　　处：《Forest Ecosystems》2021年第4期713-725,共13页森林生态系统（英文版）

基　　金：financially supported by a grant from the National Key Research and Development Program of China(2017YFC0504102);the Science and Technology Program of Jilin Provincial Education Department(JJKH20180349KJ).

摘　　要：Background:Herbs are an important part of the forest ecosystem,and their diversity and biomass can reflect the restoration of vegetation after forest thinning disturbances.Based on the near-mature secondary coniferous and broad-leaved mixed forest in Jilin Province Forestry Experimental Zone,this study analyzed seasonal changes of species diversity and biomass of the understory herb layer after different intensities of thinning.Results:The results showed that although the composition of herbaceous species and the ranking of importance values were affected by thinning intensity,they were mainly determined by seasonal changes.Across the entire growing season,the species with the highest importance values in thinning treatments included Carex pilosa,Aegopodium alpestre,Meehania urticifolia,and Filipendula palmata,which dominated the herb layer of the coniferous and broad-leaved mixed forest.The number of species,Margalef index,Shannon-Wiener index and Simpson index all had their highest values in May,and gradually decreased with months.Pielou index was roughly inverted“N”throughout the growing season.Thinning did not increase the species diversity.Thinning can promote the total biomass,above-and below-ground biomass.The number of plants per unit area and coverage were related to the total biomass,above-and below-ground biomass.The average height had a significantly positive correlation with herb biomass in May but not in July.However,it exerted a significantly negative correlation with herb biomass in September.The biomass in the same month increased with increasing thinning intensity.Total herb biomass,above-and below-ground biomass showed positive correlations with Shannon-Winner index,Simpson index and Pielou evenness index in May.Conclusions:Thinning mainly changed the light environment in the forest,which would improve the plant diversity and biomass of herb layer in a short time.And different thinning intensity had different effects on the diversity of understory herb layer.The findings provide theoretical

关 键 词：Selective thinning Mixed coniferous and broad-leaved forests Herbaceous plants DIVERSITY BIOMASS 

分 类 号：S718.5[农业科学—林学]