摘要
通过对黄土高原8个典型小流域27个采样点,70个土壤样品进行分析,应用统计方法探讨土壤机械组成、水稳性团聚体与结构体破坏率的分布特征及粘粒级别土壤中主要矿物含量对其影响。结果表明:(1)研究区>0.25mm水稳性团聚体含量从坡顶到坡底表现出升高趋势,土壤结构体破坏率表现出相反的变化趋势;(2)研究区土壤偏砂质,砂粒含量占60%以上,并且砂粒含量随纬度降低呈减少趋势,粉粒和粘粒含量则表现出增加趋势;水稳性团聚体含量以韭园沟流域为中心,两侧呈增加趋势,同时结构体破坏率表现出相反的变化;(3)从北到南,伊利石含量变化趋势与土壤粘粒含量变化趋势几乎一致;水稳性团聚体含量与方解石含量呈正相关,与正长石和钙长石含量呈负相关,并且与正长石含量表现出几乎相反的变化趋势。
Through analyzing 70soil samples of 27 sample points of 8typical small watersheds in Loess Plateau,the distribution of soil mechanical composition,water stability aggregate and the influence of main mineral on it were discussed by statistical method.The results showed that:(1)In studied region,the water stability aggregate content reduced from slop top to bottom,and the soil structure body damage rate showed the opposite trend.(2)In studied region,it leaned to sandy soil and the sand content accounted for more than 60%.Soil sand content presented decreasing with decreasing latitude,the silt and clay content presented increasing trend.With Jiuyuangou as the center,from north to south,the water stability aggregate content on both sides had an increased trend,meanwhile the soil structure body damage rate showed the reversed changes.(3)From north to south,the change trend of ilite and clay almost unanimously,the water stability aggregate with calcite was a positive correlation with orthoclase,and anorthite had a negative correlation,and the change trend of orthoclase content and water stability aggregate content was almost the contrary.
出处
《水土保持学报》
CSCD
北大核心
2013年第4期7-11,共5页
Journal of Soil and Water Conservation
基金
黄土高原土壤侵蚀与旱地农业国家重点实验室项目(10501-297)
关键词
黄土高原
土壤机械组成
水稳性团聚体
主要矿物
分布特征
Loess Plateau
soil mechanical composition
water stability aggregate
main mineral
distribution characteristics
