文献类型：期刊文献

英文题名：Spatial variation and controls of soil microbial necromass carbon in a tropical montane rainforest

作者：Ding, Zhangqi[1,2] Mou, Zhijian[1,2,3] Li, Yanpeng[4] Liang, Chao[5] Xie, Zicai[1,2,3] Wang, Jun[1,2] Hui, Dafeng[6] Lambers, Hans[7] Sardans, Jordi[8,9] Penuelas, Josep[8,9] Xu, Han[4] Liu, Zhanfeng[1,2]

第一作者：Ding, Zhangqi

通信作者：Liu, ZF[1];Xu, H[2]

机构：[1]Chinese Acad Sci, Key Lab Vegetat Restorat & Management Degraded Eco, CAS Engn Lab Vegetat Ecosyst Restorat Isl & Coasta, South China Bot Garden, Guangzhou 510650, Peoples R China;[2]South China Bot Garden, Guangdong Prov Key Lab Appl Bot, Guangzhou 510650, Peoples R China;[3]Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China;[4]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Peoples R China;[5]Chinese Acad Sci, Inst Appl Ecol, Key Lab Forest Ecol & Management, Shenyang 110016, Peoples R China;[6]Tennessee State Univ, Dept Biol Sci, Nashville, TN 37209 USA;[7]Univ Western Australia, Sch Biol Sci, Perth, WA 6009, Australia;[8]UAB, CSIC, Global Ecol Unit CREAF, Catalonia 08193, Spain;[9]CREAF, Catalonia 08193, Spain

年份：2024

卷号：921

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20240915650326);Scopus(收录号：2-s2.0-85185884199);WOS:【SCI-EXPANDED(收录号:WOS:001196835400001)】；

基金：This work was supported by the Guangdong Flagship Project of Basic and Applied Basic Research (2023B0303050001) , the National Natural Science Foundation of China (42177289 and U22A20449) , the Spanish Government Grants PID2020115770RB-I, 2022-PID2022-141972NA- I00, and TED2021-132627B-I00 funded by MCIN, AEI/10.130 39/501100011033 European Union NextGenerationEU/PRTR, the Catalan Government Grant SGR2021-1333, and the Fundacion Ramon Areces Grant CIVP20A6621.

语种：英文

外文关键词：Microbial necromass carbon; Spatial variation; Tropical forests; Amino sugars; Soil organic carbon

摘要：Soil microbial necromass carbon is an important component of the soil organic carbon (SOC) pool which helps to improve soil fertility and texture. However, the spatial pattern and variation mechanisms of fungal- and bacterial-derived necromass carbon at local scales in tropical rainforests are uncertain. This study showed that microbial necromass carbon and its proportion in SOC in tropical montane rainforest exhibited large spatial variation and significant autocorrelation, with significant high -high and low-low clustering patterns. Microbial necromass carbon accounted for approximately one-third of SOC, and the fungal-derived microbial necromass carbon and its proportion in SOC were, on average, approximately five times greater than those of bacterialderived necromass. Structural equation models indicated that soil properties (SOC, total nitrogen, total phosphorus) and topographic features (elevation, convexity, and aspect) had significant positive effects on microbial necromass carbon concentrations, but negative effects on its proportions in SOC (especially the carbon:nitrogen ratio). Plant biomass also had significant negative effects on the proportion of microbial necromass carbon in SOC, but was not correlated with its concentration. The different spatial variation mechanisms of microbial necromass carbon and their proportions in SOC are possibly related to a slower accumulation rate of microbial necromass carbon than of plant-derived organic carbon. Geographic spatial correlations can significantly improve the microbial necromass carbon model fit, and low sampling resolution may lead to large uncertainties in estimating soil carbon dynamics at specific sites. Our work will be valuable for understanding microbial necromass carbon variation in tropical forests and soil carbon prediction model construction with microbial participation.