摘要
凋落叶和根系输入是土壤有机碳(SOC)的重要植物来源,探讨凋落叶和根系去除对SOC及其组分的影响有利于深入理解森林生态系统SOC的积累机制。该研究依托中国科学院湖南会同森林生态系统国家野外科学观测研究站长达12年的凋落物去除实验(对照、凋落叶去除、根系去除、凋落叶和根系同时去除),比较了亚热带杉木(Cunninghamia lanceolata)人工林凋落叶和根系对SOC及其组分和各组分对总有机碳碳库相对贡献的影响及季节动态。结果表明:凋落叶和根系去除均会降低SOC含量,且不同凋落物去除对碳组分的相对影响各不相同。具体表现为:凋落叶去除对SOC、土壤矿质结合态有机碳(MAOC)和重组分有机碳(HFOC)含量的负效应显著大于根系去除,而根系去除对土壤颗粒有机碳(POC)含量的负效应显著大于凋落叶去除,凋落叶和根系同时去除对轻组分有机碳(LFOC)含量的负效应大于其他处理。相关性分析和冗余分析表明:碳组分含量与土壤全氮含量、碳氮比均呈正相关关系。此外,季节对POC和LFOC含量以及不同碳组分对总有机碳碳库的贡献有显著影响。夏季土壤碳组分含量与全磷含量和碳磷比的相关性明显高于冬季。该研究为长期凋落物去除对亚热带杉木林SOC及其组分的影响提供了证据,有助于探究SOC的积累机制对凋落物去除的响应。
Aims Leaf litter and root input are two major resource of soil organic carbon(SOC)accumulation.Quantifying the effects of leaf litter and root removal on SOC pool and its multiple components has implication for understanding the mechanisms of SOC stabilization in forest ecosystem.Methods Based on a long-term(12 years)litter removal experiment including control(CK),leaf litter removal(NL),root removal(NR),and both leaf litter and root removal(NLR)that conducted in Hunan Huitong Forest Ecosystem National Field Scientific Observation and Research Station,Chinese Academy of Sciences,we compared the relative importance of leaf litter and root removal on multiple components of SOC pool in a subtropical Cunninghamia lanceolata plantation in different season.Important findings Although leaf litter and root removal both reduced SOC content,the relative contribution of leaf litter and root removal on multiple SOC components were different.Specifically,the NL reduced more SOC,soil mineral-associated organic carbon(MAOC),heavy fraction organic carbon(HFOC)and readily oxidizable carbon(ROC)contents than NR and NLR.While,the NR decreased more soil particulate organic carbon(POC)content than NL and NR.In contrast,the NLR had more negative effect on light fraction organic carbon(LFOC)content than other two treatments.Correlation analysis and redundancy analysis showed that SOC components contents were positively correlated with soil total nitrogen content and carbon to nitrogen ratio.Besides,seasonal variability had significant effects on POC,LFOC contents,and their contribution of multiple carbon components to SOC.Moreover,the correlation between SOC component contents and total phosphorus content and carbon to phosphorus ratio was enhanced in winter compared with summer.Taken together,our study provides new evidence for the long-term effects of long-term litter removal on SOC and its multiple components in Chinese fir plantation,which has implications for predicting the response and feedback of SOC accumulation to global chang
作者
彭思瑞
张慧玲
孙兆林
赵学超
田鹏
陈迪马
王清奎
刘圣恩
PENG Si-Rui;ZHANG Hui-Ling;SUN Zhao-Lin;ZHAO Xue-Chao;TIAN Peng;CHEN Di-Ma;WANG Qing-Kui;LIU Sheng-En(College of Biological and Pharmaceutical Sciences,China Three Gorges University,Yichang,Hubei 443002,China;School of Forestry and Landscape Architecture,Anhui Agricultural University,Hefei 230036,China;College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,China)
出处
《植物生态学报》
CAS
CSCD
北大核心
2024年第8期1078-1088,共11页
Chinese Journal of Plant Ecology
基金
国家自然科学基金(32101491和32171752)
中国博士后科学基金(2022T150375和2021M701968)。
关键词
凋落叶去除
根系去除
土壤有机碳
碳组分
季节动态
杉木林
leaf litter removal
root removal
soil organic carbon
carbon component
seasonal variability
Chinese fir plantation
