三峡库区高砾石含量紫色土优先流形态特征

发布时间：2018-06-21 08:37

本文选题：砾石 + 土壤大孔隙　；参考：《水土保持学报》2017年01期

【摘要】：以三峡库区王家桥小流域林地、耕地和园地为研究对象,结合染色示踪技术,利用图像处理软件技术,通过计算优先流形态特征参数,分析3种土地利用类型下高砾石含量紫色土的优先流形态发育特征。结果表明:砾石平均含量表现为园地林地耕地,土壤大孔隙平均半径随着深度的增加而减小。林地优先流运动深度可达60cm,剖面染色区域呈现明显的不规则性,耕地染色深度集中在0—15cm土层,染色区域分布均匀,但染色面积小,且存在大量的侧向流,园地染色范围广,优先路径连通性好。染色路径数表现为园地林地耕地,说明园地优先流发育较活跃,优先路径分化程度较高,染色路径宽度20mm的染色路径数量分布特征与染色路径总数分布特征相近,是紫色土壤中流染色路径的主要组成部分,壤中流类型主要为低相互作用大孔隙流。砾石和大孔隙特征共同影响土壤水分运动过程。
[Abstract]:Taking the woodland, cultivated land and garden land of Wangjiaqiao small watershed in the three Gorges Reservoir area as the research object, combining with the staining tracer technique, using the image processing software technology, the characteristic parameters of the preferential flow morphology are calculated. The characteristics of preferential flow morphology of purple soil with high gravel content under three land use types were analyzed. The results showed that the average content of gravel was the cultivated land of woodland, and the mean radius of soil macropore decreased with the increase of depth. The preferential flow movement depth of forestland can reach 60 cm, and the section dyeing area shows obvious irregularity. The dyeing depth of cultivated land is concentrated in 0-15cm soil layer, the dyeing area is uniform, but the dyeing area is small, and there is a large amount of lateral flow, and the dyeing range of garden land is wide. Priority path connectivity is good. The number of dyeing paths was the cultivated land of garden forest land, which indicated that the priority flow of garden land was active, and the differentiation degree of priority path was higher. The number distribution characteristics of dyeing path width 20mm were similar to the distribution characteristics of total number of dyeing paths. It is the main component of flow dyeing path in purple soil, and the main type of flow in soil is low interaction macroporous flow. The characteristics of gravel and macroporosity affect the soil moisture movement process.
【作者单位】：华中农业大学水土保持研究中心;江西省水土保持科学研究院;秭归县水土保持试验站;
【基金】：国家自然科学基金项目(41571266) 江西省水利厅科技项目(KT201311)
【分类号】：S152.7

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