| Effects of straw mulching treatment on characteristics of soil aggregates in Weibei dryland |
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| DOI：10.7606/j.issn.1000-7601.2012.02.05 |
| Key Words: straw mulching soil aggregate MWD GMD fractal dimension |
| Author Name | Affiliation | | LI Han | Institute of Water-saving Agriculture in Arid Areas of China, Northwest A & F University, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Production and Ecology, Minister of Agriculture, Northwest A & F University, Yangling, Shaanxi 712100, China | | ZHANG Peng | Institute of Water-saving Agriculture in Arid Areas of China, Northwest A & F University, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Production and Ecology, Minister of Agriculture, Northwest A & F University, Yangling, Shaanxi 712100, China | | JIA Zhikuan | Institute of Water-saving Agriculture in Arid Areas of China, Northwest A & F University, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Production and Ecology, Minister of Agriculture, Northwest A & F University, Yangling, Shaanxi 712100, China | | SUN Hongxia | Institute of Water-saving Agriculture in Arid Areas of China, Northwest A & F University, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Production and Ecology, Minister of Agriculture, Northwest A & F University, Yangling, Shaanxi 712100, China | | HAN Lina | Institute of Water-saving Agriculture in Arid Areas of China, Northwest A & F University, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Production and Ecology, Minister of Agriculture, Northwest A & F University, Yangling, Shaanxi 712100, China | | YANG Baoping | Institute of Water-saving Agriculture in Arid Areas of China, Northwest A & F University, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Production and Ecology, Minister of Agriculture, Northwest A & F University, Yangling, Shaanxi 712100, China | | NIE Junfeng | Institute of Water-saving Agriculture in Arid Areas of China, Northwest A & F University, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Production and Ecology, Minister of Agriculture, Northwest A & F University, Yangling, Shaanxi 712100, China |
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| 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 (SM1: 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. |
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