文献类型：期刊文献

英文题名：Spatial distribution and stability mechanisms of soil organic carbon in a tropical montane rainforest

作者：Liu, Wenjie[1,5] Jiang, Yamin[1] Yang, Qiu[1] Yang, Huai[2,3] Li, Yide[3] Li, Zhaolei[4] Mao, Wei[1] Luo, Yiqi[5] Wang, Xu[1] Tan, Zhenghong[1]

第一作者：Liu, Wenjie

通信作者：Yang, H[1]

机构：[1]Hainan Univ, Sch Ecol & Environm, Haikou 570228, Hainan, Peoples R China;[2]Int Ctr Bamboo & Rattan, Beijing 100102, Peoples R China;[3]Chinese Acad Forestry, Res Inst Trop Forestry, Jianfengling Natl Key Field Res Stn Trop Forest E, Ledong 510520, Peoples R China;[4]Shandong Agr Univ, Key Lab Agr Environm Univ Shandong, Coll Resources & Environm, Natl Engn Lab Efficient Utilizat Soil & Fertilize, Tai An 271018, Shandong, Peoples R China;[5]No Arizona Univ, Ctr Ecosyst Sci & Soc, Flagstaff, AZ 86011 USA

年份：2021

卷号：129

外文期刊名：ECOLOGICAL INDICATORS

收录：;EI(收录号：20212910649281);Scopus(收录号：2-s2.0-85110124788);WOS:【SCI-EXPANDED(收录号:WOS:000684999900005)】；

基金：This work was supported by the National Natural Science Foundation of China [No. 41663010 and 412010611; and the Scientific Research Foundation of Hainan University [No. kyqd1604 and kyqd16051. The first author thanks for the financial support from China Scholarship Council.

语种：英文

外文关键词：SOC; Old-growth tropical forest; Spatial distribution; Semi-variance analysis; C-13 CPMAS/NMR

摘要：Estimation of soil organic carbon (SOC) storage and its dynamics in tropical montane forests is crucial for climate change prediction, which calls for further investigation into the spatial variation in SOC and its stability mechanisms. In this study, 60 subplots (20 m x 20 m) were randomly selected within a 60 ha tropical montane rainforest dynamic monitoring plot located in southern China. The physical (HFC and LFC) and chemical fractions of SOC (alkyl C, O-alkyl C, aromatic C and carbonyl C), microbial biomass carbon and other soil properties at depths of 0-10 cm, plant species and root biomass (0-10 cm and 10-20 cm) were investigated. Geostatistical methods, multiple regression trees and redundant analysis were used to reveal that the spatial variations in SOC and its stability mechanisms with the terrain. The results show that the spatial variations in HFC and the ratios of alkyl carbon/O-alkyl carbon had a moderate spatial dependence due to the complex terrain. High SOC and its physical stability fractions (HFC) were distributed along ridgelines, while the chemical stability index of SOC (alkyl C/O-alkyl C) was the highest on hillsides and in valleys. Terrain convexity best explained the spatial variations in SOC and HFC, while total nitrogen and convexity together best explained the spatial variation in the chemical fractions of SOC. Abiotic factors explained more of the variation in SOC and its fractions than biotic factors, while abiotic and biotic factors were covariant. The specific factors controlling the distribution of SOC and its fractions differed with the types of micro-terrain. These results highlight the influence of terrain on the distribution and accumulation of SOC in tropical forest ecosystems. Hence, terrain should be considered a key factor in biogeochemical models.