生态学报2024，Vol.44Issue(13)：5508-5518,11.DOI:10.20103/j.stxb.202309081947
增温对南亚热带季风常绿阔叶林土壤有机碳及其组分的影响
Effects of warming on soil organic carbon and its fractions of evergreen broad-leaved forests in southern subtropical monsoon region
摘要
Abstract
Global warming is the main phenomenon of current global climate change,which affects the carbon cycle in terrestrial ecosystems.Forest soils are the largest carbon pool in terrestrial ecosystems.Climate warming often affects the accumulation of soil organic carbon(C)and its different fractions in forests.Declines in soil organic C and its active C fractions are often observed under short-term warming,but it is not clear whether this negative effect still persists and whether organic C fractions change under long-term warming.This study investigated the effects of long-term warming on the soil organic C and its fractions in the south subtropical forest by simulating warming with infrared radiation in a monsoonal evergreen broad-leaf forest in Dinghu Mountain,Guangdong province.The observation results of continuous warming from 2017 to 2021 showed that,as compared with the control,warming significantly increased soil organic C by 4.5％,decreased heavy organic C pools by 9.1％,increased light organic C pools by 9.8％,and easily oxidizable C by 5.8％in the surface layer of the soil.However,warming had no significant effect on the levels of microbial biomass C,dissolved organic C,recalcitrant organic C,and complex C.Duration of warming significantly affected soil organic C,microbial biomass C,easily oxidizable C,dissolved organic C,light organic C pools,heavy organic C pools,recalcitrant organic C,and complex C.The interaction between warming treatment and duration of warming significantly affected microbial biomass C,easily oxidizable C and heavy organic C pools,but did not significantly affect soil organic C,dissolved organic C,recalcitrant organic C,complex C and light organic C pools.In conclusion,soil organic C increased due to the increase in active organic C fractions in southern subtropical monsoon forests under long-term warming,and the bioregulatory effect leading the increase in soil organic C may be larger than the protective effect of minerals.However,the decreased inert C fractions and increased active C fractions may lead to a decrease in soil organic C stability.The results of this study explored the response of soil organic C and its fractions to the long-term warming in the surface layer of the southern subtropical forests,in contrast to most studies found that the short-term warming decreased soil organic C in topsoil,and the results may provide scientific basis and theoretical support for predicting the characteristics of the future changes in soil C pools in this region.关键词
增温/土壤有机碳/有机碳组分/亚热带森林Key words
warming/soil organic carbon/organic carbon fraction/subtropical forests引用本文复制引用
翟淑君,列志旸,卢嘉华,刘旭军,刘德界,周曙仡聃,刘菊秀,褚国伟,叶茂友..增温对南亚热带季风常绿阔叶林土壤有机碳及其组分的影响[J].生态学报,2024,44(13):5508-5518,11.基金项目
广州市科技计划项目(2024A04J4587) （2024A04J4587）
国家自然科学基金(32101342) （32101342）
广东省基础与应用基础研究基金联合基金-青年基金项目(2021A1515110662) （2021A1515110662）
