文献类型：期刊文献

英文题名：Native broadleaf tree species stimulate topsoil nutrient transformation by changing microbial community composition and physiological function, but not biomass in subtropical plantations with low P status

作者：You, Yeming[1,2] Xu, Haocheng[1] Wu, Xipin[3] Zhou, Xiaoguo[1] Tan, Xumai[1] Li, Meng[1] Wen, Yuanguang[1,2,5] Zhu, Hongguang[1,2] Cai, Daoxiong[2,4] Huang, Xueman[1,2]

第一作者：You, Yeming

通信作者：Wen, YG[1]|[a00057b51efb2107ad3db]温远光;

机构：[1]Guangxi Univ, Coll Forestry, Guangxi Key Lab Forest Ecol & Conservat, Nanning 530004, Guangxi, Peoples R China;[2]Guangxi Youyiguang Forest Ecosyst Res Stn, Pingxiang 532600, Guangxi, Peoples R China;[3]Northwest Univ, Minist Educ, Key Lab Resource Biol & Biotechnol Western China, Xian 710069, Shaanxi, Peoples R China;[4]Chinese Acad Forestry, Expt Ctr Trop Forestry, Pingxiang 532600, Guangxi, Peoples R China;[5]Guangxi Acad Sci, Inst Ecol Ind, Nanning 530003, Guangxi, Peoples R China

年份：2020

卷号：477

外文期刊名：FOREST ECOLOGY AND MANAGEMENT

收录：;EI(收录号：20203309043007);Scopus(收录号：2-s2.0-85089217387);WOS:【SCI-EXPANDED(收录号:WOS:000585781900016)】；

基金：We gratefully acknowledge the support of the Guangxi Youyiguan Forest Ecosystem National Research Station for access to the site and logistical support. This study was jointly supported by grants from the National Natural Science Foundation of China (Nos. 31560201, 31860171 and 31960240), the Guangxi Natural Science Foundation (Nos. 2017GXNSFAA198207, 2018GXNSFAA294139 and 2019GXNSFAA185023) and the China Postdoctoral Science Foundation (No. 2017M612861).

语种：英文

外文关键词：Forest conversion; Microbial community; Enzyme activity; Nutrient cycle; Phosphorus; Subtropics

摘要：Microbial communities and their associated enzyme activities affect carbon (C), nitrogen (N), and phosphorus (P) metabolism in soils. We used phospholipid fatty acids (PLFAs) analysis and extracellular enzyme activity assays to evaluate the effects on topsoil microbial community and nutrient transformation of converting Chinese fir (CF) plantations to native broadleaf (Castanopsis hystrbc [CH] and Mytilaria laosensis [ML]) plantations in this study. We found that CH and ML plantations had significantly higher soil organic C (SOC), total N (TN), NH4+-N, soil C/N ratios (C/N-soil), soil C/P ratios (C/P-soil) and soil N/P ratios (N/P-soil) but significantly lower total P (TP) compared to CF plantations. A distinct shift in soil microbial community composition, but not microbial biomass was evident 23 years after stand conversion. Redundancy analysis (RDA) showed that soil microbial community composition was substantially influenced by litterfall mass (LF), TP, N/P-soil, SOC, fine root biomass (FR), C/N-soil, TN, litter C/N ratios (C/N-litter), and C/P-soil; of these, LF appeared to be the primary driver of differences in soil microbial community composition (p < 0.05). In addition, the total activity of hydrolytic enzymes involved in C metabolism (beta-glucosidase and cellobiohydrolase), N metabolism (N-acetyl-glucosaminidase), and P metabolism (acid phosphatase) increased significantly in the two native broadleaf plantations, whereas the total activity of oxidase (phenol oxidase) decreased significantly. Furthermore, the change trends of specific enzyme activity (i.e., enzymes per unit microbe) were similar to total enzyme activity. The dynamics of soil microbial enzymatic activity after stand conversion provide a functional link between changes in microbial community composition and soil nutrient transformation. Our findings suggest a mechanism in native, non-N-2-fixing broadleaf tree species that stimulates soil nutrient transformation in subtropical planted forests with low P via increases in the quantity and quality of litter and the physiological function per unit of microbial biomass.