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Design and Construction of an Experimental Setup to Enhance Mineral Weathering through the Activity of Soil Organisms
Published on: November 10, 2023
Dynamic features and mechanisms of soil aggregate stability related to soil carbon pools and microbially mediated
Khuram Shehzad Khan1, Artemi Cerdà2, Tajwar Alam3
1State Key Laboratory of Aridland Crop Science, Gansu Agricultural University, Lanzhou, 730070, China; College of Agronomy, Gansu Agricultural University, Lanzhou, 730070, China; College of Resources and Environmental Sciences, National Academy of Agriculture Green Development, China Agricultural University, Beijing, 100193, China; Institute of Soil & Environmental Sciences, University of Agriculture Faisalabad, Faisalabad, 38040, Pakistan.
Abstract:
In the context of food security and climate change mitigation, enhancing the stability of soil aggregate-mediated organic carbon (C) is crucial for long-term soil C sequestration in arid agroecosystems. Nitrogen (N) input, while essential for boosting crop productivity, profoundly influences soil aggregation, microbial activity, and the distribution of soil organic carbon (SOC) among functional pools. However, the mechanisms through which N regulates aggregate-associated SOC stabilization via microbial-mediated processes remain poorly understood. This review synthesizes recent advances on the effects of N input on soil aggregate dynamics, aggregate-associated SOC fractions, and microbial functional regulation in arid agricultural systems. We emphasize how N-driven shifts in microbial community composition, extracellular enzyme activities, functional genes, and glomalin-related processes influence aggregate formation and SOC protection. The novelty of this review lies in developing an integrated conceptual framework linking N input, soil aggregation, microbial functional responses, and aggregate-scale SOC stabilization. Our synthesis provides mechanistic insights to optimize N management strategies, thereby enhancing soil aggregate stability and maximizing long-term C sequestration, thereby promoting sustainable agriculture and climate change mitigation in arid regions.
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