Moso bamboo expansion decreased soil heterotrophic respiration but increased arbuscular mycorrhizal mycelial respiration in a subtropical broadleaved forest  

作　　者：Wenhao Jin Jiaying Tu Qifeng Wu Liyuan Peng Jiajia Xing Chenfei Liang Shuai Shao Junhui Chen Qiufang Xu Hua Qin 

机构地区：[1]The State Key Laboratory of Subtropical Silviculture,Zhejiang A&F University,Lin'an,Hangzhou,311300,China [2]College of Environmental and Resource Sciences,Zhejiang A&F University,Lin'an,Hangzhou,311300,China [3]Agricultural Technology Extension Centre,Lin'an Municipal Bureau of Agriculture,Lin'an,Hangzhou,311300,China

出　　处：《Forest Ecosystems》2023年第3期337-347,共11页森林生态系统（英文版）

基　　金：funded by the National Natural Science Foundation of China(Nos.31971631,32271850);Natural Science Foundation of Zhejiang Province under grant number LZ22C160001.

摘　　要：Moso bamboo(Phyllostachys Pubescens)expansion into adjacent forests has been widely reported to affect plant diversity and its association with mycorrhizal fungi in subtropical China,which will likely have significant impacts on soil respiration.However,there is still limited information on how Moso bamboo expansion changes soil respiration components and their linkage with microbial community composition and activity.Based on a mesh exclusion method,soil respirations derived from roots,arbuscular mycorrhizal(AM)mycelium,and free-living microbes were investigated in a pure Moso bamboo forest(expanded),an adjacent broadleaved forest(nonexpanded),and a mixed bamboo-broadleaved forest(expanding).Our results showed that bamboo expansion decreased the cumulative CO_(2)effluxes from total soil respiration,root respiration and soil heterotrophic respiration(by 19.01%,30.34%,and 29.92%on average),whereas increased those from AM mycelium(by 78.67%in comparison with the broadleaved forests).Bamboo expansion significantly decreased soil organic carbon(C)content,bacterial and fungal abundances,and enzyme activities involved in C,N and P cycling whereas enhanced the interactive relationships among bacterial communities.In contrast,the ingrowth of AM mycelium increased the activities ofβ-glucosidase and N-acetyl-β-glucosaminidase and decreased the interactive relationships among bacterial communities.Changes in soil heterotrophic respiration and AM mycelium respiration had positive correlations with soil enzyme activities and fungal abundances.In summary,our findings suggest that bamboo expansion decreased soil heterotrophic respiration by decreasing soil microbial activity but increased the contribution of AM mycelial respiration to soil C efflux,which may potentially increase soil C loss from AM mycelial pathway.

关 键 词：Bamboo expansion Soil respiration Soil organic carbon Plant C allocation Arbuscular mycorrhizal fungi 

分 类 号：S714.3[农业科学—林学]