干旱地区农业研究2012，Vol.30Issue(2)：27-33,7.
渭北旱塬区秸秆覆盖还田对土壤团聚体特征的影响
Effects of straw mulching treatment on characteristics of soil aggregates in Weibei dryland
摘要
Abstract
In order to evaluate the effects of straw mulching on the aggregation and stability of soil aggregates in Weibei dryland of Shaanxi, different amounts of straw mulch (SMI: 13 500 kg/hm2,SM2: 9 000 kg/hm2,SM3: 4 500 kg/hm2, CK: 0 kg/hm2) were selected to conduct an locating experiment. We studied the effects of straw mulching on soil bulk density, organic carbon, aggregates number, size distribution and fractal dimension for four years (2007- 2010) . The results indicated that, after maize harvest, straw mulching treatments decreased the soil bulk density and soil total organic carbon at 0 ~ 20 cm soil layer. Compared with the CK, the soil bulk density decreased varying from 2.00-% ~ 5.28 % ( P > 0.05), while the soil total organic carbon increased by 10.82 % ~ 23.93 % ( P < 0.05), and decreased with deeper layer. The dry sieving results showed that macro-aggregate content( /R0.25)? Mean weight diameter (MWD) and geometric mean diameter (GMD) in SM2 were higher than in other treatments at 10 ~ 30 cm soil layer, and had very significant difference with CK. Wet sieving results showed that macro-aggregate content, MWD and GMD in all treatments were higher than CK, but not significantly. All treatments improved the aggregate stability at 0 ~ 30 cm soil layer, and the fractal dimension (D) showed that SM2 had best aggregate stability. Therefore, the straw mulching treatments increased the aggregation and the stability of soil aggregates, ans SM2 had the best result in this experiment.关键词
秸秆覆盖还田/土壤团聚体/平均重量直径/几何平均直径/分形维数Key words
straw mulching/ soil aggregate/ MWD/ GMD/ fractal dimension分类
农业科技引用本文复制引用
李涵,张鹏,贾志宽,孙红霞,韩丽娜,杨保平,聂俊峰..渭北旱塬区秸秆覆盖还田对土壤团聚体特征的影响[J].干旱地区农业研究,2012,30(2):27-33,7.基金项目
陕西农业科技创新项目(2010NKC-03 （）
2011NXC01-16) （）
