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《Journal of Soil and Water Conservation》 2017-04
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Research on the Water Stability and the Driving Forces of Soil Aggregate After Paddy Field Switched to Tea Garden

LI Xinyu;XIA Jianguo;TIAN Wenyan;College of Environmental Sciences,Sichuan Agricultural University;College of Resources,Sichuan Agricultural University;Renhe District Government Offices;  
Adopting field investigation and indoor analysis,the changes of soil water-stable aggregates distribution and the driving forces in the conversion of paddy field to tea garden were examined.The results showed that soil water-stable aggregate in the paddy field and tea garden was different among different size class and soil layer.With the decrease of the particle size,the water-stable aggregate firstly decreased and then increased in paddy soil and tea plantation with 5years,10 years.In the 15 years tea garden,water-stable aggregate was increased with the decrease of the particle size.With the increasing years of tea planation,water-stable aggregate was given priority to 2 mm turn into 0.25 mm both in 0—20cm and 20—40cm soil layer,while0.25 mm water-stable aggregate was the predominant contributor in 40—60cm soil layer.The water stability of soil aggregate decreased with the increasing years both in 0—20cm and 20—40cm soil layer,whereas the ranking from high to low in 40—60cm soil layer was:tea plantation 5yearstea plantation 10yearspaddy fieldtea plantation 15 years.The stability water of soil aggregate was positively correlated with the content of0.25 mm water-stable aggregate.The water stability of soil aggregates was positively correlated with the soil chemical properties,and the main driving factors were 0.25 mm aggregates,soil bulk density and total porosity.In terms of nutrients,the driving forces of water stability in paddy field,tea garden 5years,10 years and 15 years were organic matter,organic matter and CEC,organic matter,CEC and effective phosphorus content,content of CEC,respectively.
【Fund】: 四川省学术和技术带头人培养基金项目(2014);; 四川农业大学学科建设双支计划项目(2016)
【CateGory Index】: S152.4
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