摘要
利用连续收获法研究了川西亚高山老龄林(VF)、桦木林(BF)、次生针阔混交林(MF)、人工云杉林(AF)及高山栎灌丛(AO) 5种主要森林类型的凋落物组成及其动态,目的在于探索不同恢复途径对森林凋落物组成和产量的影响。结果表明,5种森林类型的全年凋落产量大小依次为VF(4.32 t/hm^2)、MF(4.10 t/hm^2)、BF(3.52 t/hm^2)、AO(3.01 t/hm^2)、AF(2.34 t/hm^2)。AF全年凋落量显著小于其他3种乔木森林类型(VF,BF,MF)(P <0. 05)。各森林类型的叶片年凋落量占总量比例均超过70%。VF、AF、AO均在生长前期(前一年10月至当年5月)达到最大凋落量2.41,1.29,1.63 t/hm^2; BF、MF凋落产量在生长季后期(当年7月至10月)到达最大值,分别为1.34,1.80 t/hm^2。常绿针叶树为主的VF、AF叶片凋落物样地间变异显著高于落叶阔叶树为主的BF、MF,表明其对立地条件的响应更为敏感。林分密度与胸高断面积组合因子更能反映凋落物特征。
Litter composition was investigated for a whole year in five representative forest types: virgin forest(VF),secondary birch forest(BF),secondary coniferous and broad-leaved mixed forest(MF),artificial spruce forest(AF),and alpine oak(AO),in west Sichuan,in order to understand the litter dynamic and spatial variation among different restoration approaches. The annual litter production for VF,MF,BF,AO,and AF was 4.32,4.10,3.52,3.01,and 2.34t/hm^2,respectively. Litter production was significantly lower in AF than that in the other three forest types(VF,BF,and MF). More than 70% of annual litter was leaf in all forest types. Litter production of VF,AF,and AO reached its peak value(2.41,1.29,and 1.63 t/hm^2,respectively) in the pre-growing season(previous October-May),while that for BFand MF achieved their maximum(1.34 and 1.80 t/hm^2,respectively) in the late growing season(July-October). Spatial variation of leaf litter for VF and AF,both composed of evergreen coniferous species,was significantly greater than that for BF and MF,with more deciduous species. Spatial variation analysis indicated that sensitivity of litter production to stand condition was higher for evergreen coniferous forest(VF,AF) than that for deciduous forest. The combination of stand density and area at breast height was advantageous in evaluating litter production.
作者
张远东
刘彦春
顾峰雪
郭明明
缪宁
刘世荣
ZHANG Yuandong;LIU Yanchun;GU Fengxue;GUO Mingming;MIAO Ning;LIU Shirong(Key Laboratory of Forest Ecology and Environment,State Forestry Administration,Institute of Forest Ecology,Environment and Protection,ChineseAcademy of Forestry,Beijing 100091,China;School of Life Sciences,Henan University,Kaifeng 475004,China;Key Laboratory of Dryland Agriculture,Ministry of Agriculture,Institute of Environment and Sustainable Development in Agriculture,Chinese Academy ofAgricultural Sciences,Beijing 100081,China;International Centre for Bamboo and Rattan,Beijing 100102,China;Key Laboratory of Bio?resources and Eco?environment (Ministry of Education),College of Life Sciences,Sichuan University,Chengdu 610064,China)
出处
《生态学报》
CAS
CSCD
北大核心
2019年第2期502-508,共7页
Acta Ecologica Sinica
基金
国家自然科学基金项目(31770490
31370463)
关键词
凋落物
动态
恢复途径
亚高山森林
litter
dynamic
restoration approach
subalpine forest
