文献类型：期刊文献

英文题名：Plant restoration leads to divergent sequestration of soil carbon and nitrogen in different fractions in an arid desert region

作者：Jia, Xiao-hong[1,2] Li, Yuan-shou[3] Wu, Bo[1] Lu, Qi[1] Li, Xin-rong[2]

第一作者：Jia, Xiao-hong

通信作者：Li, YS[1]

机构：[1]Chinese Acad Forestry, Inst Desert Studies, Beijing 100091, Peoples R China;[2]Chinese Acad Sci, Shapotou Desert Res & Expt State Key Stn, Cold & Arid Reg Environm & Engn Res Inst, Lanzhou 730000, Gansu, Peoples R China;[3]China Meteorol Adm, Chinese Acad Meteorol Sci, 46 Zhongguancun South St, Beijing 100081, Peoples R China

年份：2019

卷号：30

期号：18

起止页码：2197-2210

外文期刊名：LAND DEGRADATION & DEVELOPMENT

收录：;EI(收录号：20193407333858);Scopus(收录号：2-s2.0-85070760162);WOS:【SCI-EXPANDED(收录号:WOS:000481591200001)】；

基金：Chinese National Natural Science Foundation, Grant/Award Numbers: 41471096 and 41371093; Investigation Special Project of Scientific and Technological Fundamental Resources, Grant/Award Number: 2017FY100206; State Key Research and Development Program of China, Grant/Award Number: 2016YFC0500801; Fundamental Research Funds for the Central Non-profit Research Institution of CAF, Grant/Award Number: YBB2016ZD010

语种：英文

外文关键词：arid desert; plant restoration; sand fraction; silt and clay fraction; soil nitrogen; soil organic carbon

摘要：Soil organic carbon (OC) and nitrogen (N) associated with particle size fractions can be used as sensitive indicators to evaluate impacts of land use change on soil total OC (TOC) and total N (TN) pools. Aeolian sandy-soils were collected from seven sites in the Tengger Desert, representing a 56-year chronosequence of plant restoration at decadal intervals in an arid desert region. Bulk soils were separated into silt + clay (<53 mu m), fine sand (53-100 mu m), and coarse sand (>100 mu m) fractions. TOC and TN concentrations of bulk soil and their levels associated with particle size fractions were analyzed. Results showed that plant restoration promoted C and N sequestration in both topsoil and subsoil layers over time, as indicated by elevated levels of OC and N associated with silt + clay and sand fractions. TOC and TN concentrations of 56-year restored topsoil respectively increased by 31- and 43-fold than did the control (moving dunes); corresponding levels associated with silt + clay or coarse sand fraction respectively increased by more than 30- and 20-fold, whereas less than 15-fold increases were found in fine sand fraction. In the early stages of plant restoration, both C and N sequestration primarily resulted from finer particle size fractions. In the later stages, increased C sequestration was principally derived from coarse sand fraction, whereas N sequestration was mainly derived from silt + clay fraction. The results highlight that plant restoration stage and soil textural change are key factors leading to divergent soil C and N sequestration in the arid desert region.