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

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Forest Ecosystems 2023年第3期10卷 337-347页

作者： Wenhao Jin Jiaying Tu Qifeng Wu Liyuan Peng Jiajia Xing chenfei Liang Shuai Shao Junhui chen Qiufang Xu Hua Qin The State Key Laboratory of Subtropical Silviculture Zhejiang A&F UniversityLin'anHangzhou311300China college of Environmental and Resource Sciences Zhejiang A&F UniversityLin'anHangzhou311300China Agricultural Technology Extension centre Lin'an Municipal Bureau of AgricultureLin'anHangzhou311300China

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 ***,there is still limited information on how Moso bamboo expansion changes soil respiration components and their linkage with microbial community composition and *** 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 *** contrast,the ingrowth of AM mycelium increased the activities ofβ-glucosidase and N-acetyl-β-glucosaminidase and decreased the interactive relationships among bacterial *** in soil heterotrophic respiration and AM mycelium respiration had positive correlations with soil enzyme activities and fungal *** 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

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