水土保持研究2024，Vol.31Issue(6)：336-343,8.DOI:10.13869/j.cnki.rswc.2024.06.030
湘西北土壤物理健康对土地利用转换的响应
Response of Soil Physical Health to Land Use Change in Northwest Hunan Province
摘要
Abstract
[Objective]The aims of this study are to reveal the effects of conversion of primary forest to other land use on soil physical health,and to provide scientific basis for rational development and utilization of land resources in the central subtropical mountain region.[Methods]The top soils in typical primary forests and converted plantations,orchards,sloping tillage,and paddies in northwest Hunan Province were selected.The response of major soil physical properties to the primary forest conversion was studied.[Results](1)Following the primary forest conversion to orchard and sloping tillage,the content of sand in soil increased,the soil particle composition showed coarsening trend,and the bulk density and compactness increased by 24％～28％and 27％～76％,respectively,leading to significant topsoil compaction(p＜0.05).(2)Compared to the primary forest,the soil maximum water holding capacity,capillary water holding capacity,and field water holding capacity reduced by 15％～30％,15％～32％and13％～21％,respectively,in orchard,sloping cropland,and paddy.And the content of macroaggregate,mean weight diameter,geometric mean diameter,and aggregate stability index decreased by 34％～59％,27％～52％,36％～73％and 49％～61％,respectively,whereas the fractal dimension increased by 31％～80％(p＜0.05),and the contents of small aggregate,microaggregate,and silt-clay particle tended to increase.[Conclusion]The primary forest conversion resulted in the reduction of water-holding capacity,structural deterioration,and physical health degradation in soil.The response ratios of soil physical properties were lower for the primary forest conversion to plantation than for the primary forest conversion to orchard and sloping cropland.The capacity of soil and water conservation and soil physical health maintenance were higher in plantation than in orchard and sloping cropland.The soil aggregate stability index was sensitive,simply processed,and low-cost,and was recommended for soil health evaluation.关键词
土地利用方式/土壤物理性质/土壤持水性能/团聚体稳定性Key words
land use type/soil physical properties/soil water holding capacity/aggregate stability分类
农业科技引用本文复制引用
王俊,肖华翠,盛浩,周萍..湘西北土壤物理健康对土地利用转换的响应[J].水土保持研究,2024,31(6):336-343,8.基金项目
湖南省重点研发计划项目(2023NK2026) （2023NK2026）
国家自然科学基金(41571234) （41571234）
科技基础资源调查专项课题(2021FY100504) （2021FY100504）
