文献类型：期刊文献

英文题名：The stability of soil organic carbon across topographies in a tropical rainforest

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

第一作者：Jiang, Yamin

通信作者：Liu, WJ[1];Liu, WJ[2];Li, ZL[2]

机构：[1]Hainan Univ, Coll Ecol & Environm, Haikou, Hainan, Peoples R China;[2]Int Ctr Bamboo & Rattan, Beijing, Peoples R China;[3]Chinese Acad Forestry, Res Inst Trop Forestry, Jianfengling Natl Key Field Res Stn Trop Forest E, Haikou, Hainan, Peoples R China;[4]No Arizona Univ, Ctr Ecosyst Sci & Soc, Flagstaff, AZ 86011 USA

年份：2021

卷号：9

外文期刊名：PEERJ

收录：;EI(收录号：20224413022887);Scopus(收录号：2-s2.0-85114025574);WOS:【SCI-EXPANDED(收录号:WOS:000696921000001)】；

基金：This work was supported by the Natural Science Foundation of Hainan province [No.2019RC012 and 418MS019]; the National Key R&D Program of China [NO. 2018YFD0201105]; the National Natural Science Foundation of China [No. 41663010 and 41201061]. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.

语种：英文

外文关键词：Soil organic carbon stability; Topography; Tropical forest; 13C CPMAS/NMR; Path analysis

摘要：Mechanisms of soil organic carbon (SOC) stability are still unclear in forest ecosystems. In order to unveil the influences of topography on the SOC stability, a 60ha dynamic plot of a tropical montane rainforest was selected in Jianfengling, in Hainan Island, China and soil was sampled from 60 quadrats. The chemical fractions of the SOC were detected with 13C CPMAS/NMR and path analyses explore the mechanisms of SOC stability in different topographies. The chemical fractions of the SOC comprised alkyl carbon > O-alkyl carbon > carboxyl carbon > aromatic carbon. The decomposition index (DI) values were greater than 1 in the different topographies, with an average DI value was 1.29, which indicated that the SOC in the study area was stable. Flat and top areas (together named RF) had more favorable nutrients and silt contents compared with steep and slight steep areas (together named RS). The influencing factors of SOC stability varied across the topographies, where SOC, soil moisture (SM) and ammoniacal nitrogen (NH4+-N, AN) were the main influencing factors in the RF, while SM and AN were the main factors in the RS. Greater SOC and AN strengthened the SOC stability, while higher soil moisture lowered SOC stability. The inertia index was higher in the RS than the RF areas, indicating that local topography significantly affects SOC content and SOC stability by changing soil environmental factors. Topography cannot be neglected in considering SOC stability and future C budgets.