土壤2016，Vol.48Issue(2)：361-367,7.DOI:10.13758/j.cnki.tr.2016.02.023
红壤丘陵区坡地土壤颗粒组成的空间分布特征研究
Spatial Distribution Characteristics of Soil Particle Composition of Slope Land Red Soil Region, China
摘要
Abstract
The soil particle composition of 14 soil profiles(0 – 100 cm)in red soil hilly region was investigated along a slope. The spatial distribution of soil particle composition in both horizontal and vertical direction was analyzed combining with the related data, e.g. soil erosion. The objectives of the present study were to clarify the spatial distribution characteristics of soil sand, soil silt and soil clay under the slope scale, and to reveal the migration law of them in two directions under natural conditions. Results showed that sand, silt and clay contents exhibited moderate spatial heterogeneity, with coefficient of variation changing between 17.6% and 23.2%, 10.7% and 18.8%, 13.5% and 17.0%, respectively. Due to the deposition of coarse particles, higher sand content was observed in bottom slope than top and middle slope in both peanut and citrus orchard land (P < 0.05). The clay content in bottom slop was, however, significantly lower than other slop position (P < 0.05). Soil sand content decreased whereas the clay content increased with increasing soil depth (P < 0.05) for both vegetation types, mainly due to the movement of more clay particles with the infiltration process of soil water. The silt content did not change significantly in both horizontal and vertical directions. Sand content had stronger variation among slope positions and soil depths than silt and clay contents. In addition, the distribution of soil particles were also affected by vegetation types and cropping systems. The migration of soil sand along the slope was more significant in peanut land than in citrus orchard. The migration rate of clay in the vertical direction was stronger for citrus land than peanut land. However, vegetation types and cropping systems had little effects on the distribution of soil silt content.关键词
土壤黏粒/土壤砂粒/植被类型/坡位/土壤侵蚀Key words
Soil clay/Soil sand/Vegetation type/Slope position/Soil erosion分类
农业科技引用本文复制引用
王冬冬,高磊,陈效民,彭新华..红壤丘陵区坡地土壤颗粒组成的空间分布特征研究[J].土壤,2016,48(2):361-367,7.基金项目
国家自然科学基金项目(41301233)和“十二五”国家科技支撑项目(2011BAD31B04)资助。 （41301233）
