三峡库区植物篱系统土壤颗粒分布及粘粒与土壤理化性质关系

Soil Particle Distribution and Relationship between Soil Silt Concentration and Physicochemical Properties of Hedgerow Systems in the Three Gorges Reservoir Area

摘要: 在调查分析长江三峡库区现有坡耕地植物篱的配置方式、生长状况和室内分析植物篱系统内土壤颗粒组成和土壤理化性质的基础上，对3种植物篱系统中土壤颗粒分布特征及土壤粘粒与土壤理化性质的关系进行了研究，结果表明：1) 植物篱系统中不同位置土壤颗粒含量存在显著差异，乔木类、草本类和灌木类植物篱带间坡耕地土壤砂粒含量比其对应的植物篱带内土壤砂粒平均含量分别高10.4%，13.7%和9.2%；而粘粒含量在植物篱带内富集，其平均含量比植物篱带间坡耕地土壤粘粒含量分别高14.3%，19.5%和10.7%；2) 植物篱系统内土壤粘粒含量与土壤孔隙度、土壤含水量、饱和导水率、土壤抗冲指数、土壤抗蚀指数、水稳性团聚体极显著正相关，而与土壤容重呈显著负相关关系。3) 土壤粘粒含量与土壤全氮、有效氮、土壤全钾、有效钾、全磷、有效磷和阳离子交换量具有极显著正相关关系。

Abstract: To achieve the soil particle distribution characters and the relationship between physicochemical properties of hedgerow systems in the Three Gorges reservoir area, soil particle size composition and physicochemical properties of soil collected from different position in hedgerow systems with different species were tested, and the coefficient between soil silt concentration and physico-chemical properties were analyzed. The result revealed that 1) the particle size concentration in the hedgerow systems diversified significantly. The soil sand concentration in the steep land be- tween hedgerows with different species was higher than that of soil within hedgerows stipe, by 10.4%, 13.7% and 9.2% respectively. However, the soil silt concentration enriched within hedge- rows strip, and the mean value of soil silt concentration with different species increased by 14.3%, 19.5% and 10.7% respectively compared with the soil between hedgerow steeps. 2) The silt con- centration of soil in hedgerow systems were correlated positively and highly significantly (P < 0. 01) with the soil porosity, water content, soil saturated water conductivity, anti-erodibility, anti- scouribility and soil water stable aggregates content, and correlated negatively with soil bulk density. 3) The silt concentration of soil in hedgerow systems were positively correlated with soil nutrients, containing total and exchangeable nitrogen, total and exchangeable phosphorus, total and exchangeable potassium, and cation exchangeable capacity.