Soil aggregate and its response to land management practices--颗粒学报PARTICUOLOGY

Wei, C., Gao, M., Shao, J., Xie, D., & Pan, G. (2006). Soil aggregate and its response to land management practices. China Particuology, 4(5), 211–219. https://doi.org/10.1016/S1672-2515(07)60263-2

Soil aggregate and its response to land management practices

Chaofu Wei^{a b *}, Ming Gao ^{a b}, Jingan Shao ^{a b}, Deti Xie^{a b}, Genxing Pan ^c

a College of Resource and Environment, Southwest University, Chongqing 400716, P.R. China
b Chongqing Key Laboratory of Digital Agriculture, Chongqing 400716, P.R. China
c Institute of Resource, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, Nanjing 210095, P.R. China

10.1016/S1672-2515(07)60263-2

Volume 4, Issue 5, October 2006, Pages 211-219

Received 24 November 2005, Accepted 10 August 2006, Available online 27 November 2007.

E-mail: weicf@swau.edu.cn

Highlights

Abstract

This paper provides a broad review of the existing study on soil aggregate and its responses to land management practices. Soil aggregate is used for structural unit, which is a group of primary soil particles that cohere to each other more strongly than other surrounding particles. The mechanism of soil particle aggregation may be expressed by a hierarchical model, which is based upon the hypothesis that macroaggregates (>250 μm) are collections of smaller microaggregates (<250 μm) held together with organic binding agents. Primary particles form microaggregates and then macroaggregates. Carbon (C)-rich young plant residues form and stabilize macroaggregates, whereas old organic C is occluded in the microaggregates. The interaction of aggregate dynamics with soil organic carbon (SOC) is complex and embraces a range of spatial and temporal processes within macroaggregates and microaggregates. The nature and properties of aggregates are determined by the quantity and quality of coarse residues and humic compounds and by the degree of their interaction with soil particles. The mechanisms resulting in the binding of primary soil particles into stable aggregates vary with soil parent material, climate, vegetation, and land management practices. Land management practices, including tillage methods, residue management, amendments, and soil fertility management, enhance soil aggregation. However, there is still much uncertainty in the dynamics of organic matter in macroaggregation and microaggregation, and research is still needed to understand further the mechanisms of aggregate formation and its responses to human activities.

Graphical abstract

Keywords

soil structure; soil aggregate; macroaggregates; microaggregates; SOC; land management practices

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