作　　者： ; ;

机构地区： 中国科学院华南植物研究所

出　　处： 《生态学报》 2002年第9期1534-1544,共11页

摘　　要： 综述了森林凋落物研究的进展 ,森林凋落物动态的研究随研究方法的改进而不断深化。制约凋落物分解速率的因素有内在因素即凋落物自身的化学物理性质和外在因素即凋落物分解过程发生的外部环境条件 ,如参与分解的异养微生物和土壤动物群落的种类、数量、活性 (生物类因素 )和气候、土壤、大气成分等 (非生物类因素 )。讨论了全球变暖可能引起的凋落物量和凋落物分解的变化。气温上升可能引发植被分布、物候特征和制约凋落物分解因素的改变 ,影响森林凋落物动态 ,最终影响森林生态系统物质循环的功能。 In this article we reviewed the latest development in the studies on the forest the litter dynamics. Study on the litter dynamics advances with the improvement of research methods. Litter decomposition rate is controlled by both the intrinsic factors such as the chemical and physical properties of litter and by the extrinsic factors i.e. environmental conditions including biotic factors such as the species, abundance and activity of the heterotrophic microbiomes and soil fauna, and abiotic factors such as climate, soil and atmospheric compositions. As the control factors of litter decomposition, the chemical properties of litter (also called litter substrate quality) include concentrations of nitrogen, phosphorus, lignin and cellulose; and the ratios of C/N, lignin/N, C/P etc. Among them C/N and lignin/N are the best predication indexes of litter decomposition rates, because they reflect the ratio of carbohydrate and lignin to protein in litter, which is the essential property of litter. However on the different stages of litter decomposition the predication indexes should be altered with the change of litter substrate quality. With respect to the abiotic factors, rising temperature increases the litter decomposition rate. Rainfall affects the leaching of chemical substances in litter. Nutrient status of soils affects the litter quality, hence influences the litter decomposition rate. Temperature, rainfall and other abiotic factors also indirectly influence litter decomposition through their effects on the biotic factors. With regard to the biotic factors, the activities of microbiomes and soil fauna are more important on the later stage to decompose recalcitrant component in litter. We also discussed the likely changes of forest litter dynamics due to global warming. Global warming might lead to the moving of forest zone and the changes of the factors that control litter decomposition, thus it affect the dynamics of forest litter and the function of nutrient cycling in forest ecosystems. Global warming

关 键 词： 森林凋落物动态 全球变暖 响应 凋落物分解速率

领　　域： [农业科学] [环境科学与工程]