生态学杂志2024，Vol.43Issue(5)：1390-1398,9.DOI:10.13292/j.1000-4890.202405.034
降水季节性分配格局对亚热带灌木凋落物分解的影响
Effects of seasonal distribution pattern of precipitation on shrub litter decomposition in a subtropical forest
摘要
Abstract
Changes in the seasonal distribution of precipitation induced by climate change affect water availability,microbial activity,and related enzyme activities,which may exert an influence on forest litter decomposition,deserving to be further studied.In this study,we examined decomposition dynamics of leaf litter of Phyllostachys violascens and Alangium chinense,two common shrub species in a subtropical evergreen broad-leaved forest in China in different stages of dry and wet seasons from 2020 to 2021 using field in-situ control experiment and litter-bag methods.There were three precipitation treatments:control(CK),drier dry season,increased extreme precip-itation in wet season(DD),and drier dry season,proportionally increased precipitation in wet season(EW).The results showed that species identity,precipitation treatment,and decomposition stage all affected litter decomposi-tion rate.During the experimental period,the precipitation pattern of drier dry season and wetter wet season(DD and EW)significantly increased decomposition rates of the two types of litter(more than 2.01％for P.violascens and more than 4.69％for A.chinense),and the effect of the proportionally increased precipitation in wet season was the most significant.In addition,the precipitation pattern of drier dry season and wetter wet season increased the contribution rate of the two types of litter in the wet season to the total year-round decomposition,with the effect of proportionally increased precipitation in wet season being more obvious.This is contributed to the precipitation pat-tern of drier dry season and wetter wet season can indirectly improve litter decomposition by reducing the content of refractory substances and elements in litter through a positive effect on enzyme activity and microbial biomass.As a result of climate change,changes in precipitation distribution patterns will not only affect the decomposition of sub-tropical forest litter,but also change the contribution rate of dry season and wet season to the total annual decompo-sition.关键词
凋落物分解/亚热带森林/全球变化/生物地球化学循环/干湿季Key words
litter decomposition/subtropical forest/global change/biogeochemical cycling/dry and wet seasons引用本文复制引用
武启骞,李彦..降水季节性分配格局对亚热带灌木凋落物分解的影响[J].生态学杂志,2024,43(5):1390-1398,9.基金项目
国家自然科学基金项目(41730638和31901294)、中国博士后科学基金项目(2020M671795和2020T130600)、浙江农林大学科研发展基金项目(2021LFR010)、浙江省"尖兵"、"领雁"研发攻关计划项目(2022C02019)和高等学校学科创新引智计划(D18008)资助. （41730638和31901294）
