文献类型：期刊文献

英文题名：Soil carbon storage in mangroves is primarily controlled by soil properties: A study at Dongzhai Bay, China

作者：Xiong, Yanmei[1] Liao, Baowen[1] Proffitt, Ed[2] Guan, Wei[1] Sun, Yuxin[3] Wang, Faming[4] Liu, Xiu[5]

第一作者：熊燕梅

通信作者：Xiong, YM[1]

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, Key Lab State Forestry Adm Trop Forestry, Guangzhou 510520, Guangdong, Peoples R China;[2]Texas A&M Univ Corpus Christi, Dept Life Sci, Corpus Christi, TX 78412 USA;[3]Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Trop Marine Bioresources & Ecol, Guangzhou 510301, Guangdong, Peoples R China;[4]Chinese Acad Sci, South China Bot Garden, Key Lab Vegetat Restorat & Management Degraded Ec, Guangzhou 510650, Guangdong, Peoples R China;[5]Guangxi Acad Forestry, Nanning 530002, Peoples R China

年份：2018

卷号：619

起止页码：1226-1235

外文期刊名：SCIENCE OF THE TOTAL ENVIRONMENT

收录：;EI(收录号：20174704448941);Scopus(收录号：2-s2.0-85034658269);WOS:【SCI-EXPANDED(收录号:WOS:000424144200124)】；

基金：We thank Dr. Catherine Lovelock for constructive comments that greatly improved an earlier draft of the manuscript. Our sincere thanks are extended to Dr. Weixin Zhang, Dr. Dima Chen and Dr. Zhang Zhou for helpful discussion in preparing the manuscript. This work was supported by the National Natural Science Foundation of China (grant numbers 41776103 and 41573084); the Chinese Academy of Forestry (grant number RITFYWZX2015-03); and the Guangdong Forestry Department (grant number 2014KJCX021-02).

语种：英文

外文关键词：Blue carbon; Coastal wetlands; Carbon stock; Subsoil carbon; Soil carbon decomposition; Sediment

摘要：Coastal wetlands are well known for their considerable capacity to store carbon (C). However, the spatial patterns and major controls of soil C concentration and C density in coastal wetlands remain poorly known. We measured soil total C concentration up to one meter depth and assessed environmental and biological factors influencing soil C input and decomposition processes across various geomorphologic settings and mangrove forest types at Dongzhai Bay, China. Structural equation modeling (SEM) was used to determine the causal pathways of influencing factors on soil C concentration. We found that the variation pattern of soil C concentration across geomorphologic settings and forest types was mirrored by soil properties. From 68 to 94% (varying with soil depth) variations of soil C concentration were explained by the inter-related influencing factors included in SEM. In the upper 60 cm soil layers, soil moisture was the most important factor affecting soil C concentration. In the 60-100 cm subsoil zone, the proportion of finer soil particles was the primary control of soil C concentration variation. In contrast, aboveground biomass and nearness of sampling site to the open water, which affect autochthonous and allochthonous C inputs, had relatively weak effects on soil C concentration compared to soil properties, which affect C decomposition. Soil C concentration was a good predictor of soil C density at all soil depths. The results suggest that top-and subsoil C concentrations in mangroves are subjected to different environmental controls, but taken together, mangrove soil C storage may be primarily controlled by soil property-mediated C decomposition rate. Subsoil C deserves more attention since it may respond differently to environmental changes than the better-known topsoil C. (c) 2017 Published by Elsevier B.V.