globalchange  > 气候变化与战略
DOI: 10.1016/j.agee.2020.106866
Synchronous sequestration of organic carbon and nitrogen in mineral soils after conversion agricultural land to forest
Author: Zhang Y.; Liao X.; Wang Z.; Wei X.; Jia X.; Shao M.
Source Publication: Agriculture, Ecosystems and Environment
ISSN: 1678809
Publishing Year: 2020
Volume: 295
Language: 英语
Keyword: Abandoned farmland ; Afforestation chronosequence ; Black locust ; Organic carbon and nitrogen dynamics ; Soil aggregates
Scopus Keyword: abandoned land ; afforestation ; agricultural land ; carbon sequestration ; deciduous tree ; global warming ; macroaggregate ; organic carbon ; soil aggregate ; topsoil ; China ; Loess Plateau ; Robinia pseudoacacia
English Abstract: Agricultural land-use change is a global issue with significant implications for global warming and ecosystem functionality. Uncertainty regarding carbon (C) and nitrogen (N) sequestration and their dynamics after land-use change hampers an accurate understanding of the C and N cycles. To address the influence of converting agricultural land to forest on organic carbon (OC) and N sequestration and their coupling relationships, we collected topsoil (0−10 cm depth) and subsurface soil (10−20 cm depth) in afforested woodlands 10, 20, and 35 yrs after the establishment of Robinia pseudoacacia in abandoned farmlands on the Loess Plateau, China. We analyzed the concentrations and stocks of OC and N in bulk soils and water-stable aggregates. We found that afforestation of farmland resulted in a relative increase of 30 % in the proportion of macroaggregates (8 – 0.25 mm) but a relative decrease of 45 % and 30 % in the proportions of microaggregates (0.25 - 0.053 mm) and silt + clay (< 0.053 mm), respectively. The respective OC and N stocks increased by 87 % and 74 % in bulk soils and by 278 % and 159 % in macroaggregates after 35 yrs of afforestation. Macroaggregates accounted for 69 % and 68 % of the OC and N stocks, respectively, in bulk soils at the 0−20 cm depth. However, the OC and N stocks in microaggregates and silt + clay were only slightly affected. These results indicated that the conversion of agricultural land to forest could sequester OC and N in both bulk soils and aggregates, mainly macroaggregates. In addition, the dynamics of OC and N were significantly correlated, implying synchronous OC and N sequestration in soils after converting agricultural land to forest. © 2020 Elsevier B.V.
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被引频次[WOS]:5   [查看WOS记录]     [查看WOS中相关记录]
Document Type: 期刊论文
Appears in Collections:气候变化与战略

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Affiliation: State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A&F University, Yangling, 712100, China; CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, 710061, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, 100049, China

Recommended Citation:
Zhang Y.,Liao X.,Wang Z.,et al. Synchronous sequestration of organic carbon and nitrogen in mineral soils after conversion agricultural land to forest[J]. Agriculture, Ecosystems and Environment,2020-01-01,295
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