DOI: 10.1016/j.agee.2020.106866
论文题名: Synchronous sequestration of organic carbon and nitrogen in mineral soils after conversion agricultural land to forest
作者: Zhang Y. ; Liao X. ; Wang Z. ; Wei X. ; Jia X. ; Shao M.
刊名: Agriculture, Ecosystems and Environment
ISSN: 1678809
出版年: 2020
卷: 295 语种: 英语
英文关键词: Abandoned farmland
; Afforestation chronosequence
; Black locust
; Organic carbon and nitrogen dynamics
; Soil aggregates
Scopus关键词: abandoned land
; afforestation
; agricultural land
; carbon sequestration
; deciduous tree
; global warming
; macroaggregate
; organic carbon
; soil aggregate
; topsoil
; China
; Loess Plateau
; Robinia pseudoacacia
英文摘要: 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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/158086
Appears in Collections: 气候变化与战略
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作者单位: 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