摘要
利用植物篱控制水土流失的长期定位实验,采用数理统计法研究了13 a期植物篱-农作坡耕地土壤微团聚体组成及分形特征。结果表明,与传统横坡农作模式相比,植物篱能明显增加<0.2 mm粒级土壤微团粒含量,尤其是0.2～0.05 mm粒级,提高了土壤微团聚体分形维数与团聚度,降低了坡耕地土壤小粒级微团聚体在下坡位的相对富集程度,优化了土壤大小粒级微团聚体的坡面分布。紫色丘陵区植物篱-农作模式下土壤微团聚体分形维数反映了坡耕地土壤的物理性质、养分肥力与抗蚀能力。
Based on a long-term （ 13 a） experiment on effect of hedgerows controlling soil and water loss, composition and fractal features of soil micro-aggregates in slope farmlands with established hedgerows were studied with mathematical statistics. Results show that compared to the pattern of traditional contour cropping, the pattern of contour cropping plus hedgerows obviously increased the content of soil micro-aggregates, 〈 0.2 mm in particle size, especially the fraction of 0. 2 - 0.05 mm. Hedgerows significantly increased soil micro-aggregate fractal dimension （D） and aggregation degree, reduced relative enrichment of soil micro-aggregates small in particle size at lower slopes, and optimized slope distribution of soil large-and small-sized micro-aggregates. The soil micro-aggregate D values reflect soil physical properties, soil fertil- ity, and erosion-resistance of slopelands under the pattern of contour cropping plus hedgerow in the purple hill region.
出处
《土壤学报》
CAS
CSCD
北大核心
2012年第6期1069-1077,共9页
Acta Pedologica Sinica
基金
国家"十二五"水专项(2012ZX07104-003)
重庆市工程技术研究中心建设项目(CSTC
2010CB7008)
西南大学生态学重点学科"211工程"经费资助
关键词
植物篱
土壤微团聚体
分形特征
坡面分布
Hedgerows
Soil micro-aggregates
Fractal features
Slope distribution
