稻田植茶后土壤团聚体水稳性变化特征及影响因素分析

发布时间：2018-05-12 01:40

本文选题：土壤 + 团聚体　；参考：《水土保持学报》2017年04期

【摘要】：采用野外调查与室内分析相结合的方法,研究名山地区稻田植茶后土壤团聚体水稳性变化特征及其影响因素。结果表明:稻田及植茶后的土壤水稳性团聚体含量在各粒径及土层间表现不同,稻田、茶园5年和10年土壤水稳性团聚体含量总体上随着粒径的减小呈先降低后上升的趋势,茶园15年水稳性团聚体含量则随着粒径的减小逐渐增加。从不同土层来看,在0—20,20—40cm土层中,随着稻田植茶年限的增加,土壤团聚体含量以2mm粒径团聚体为主转变为以0.25mm粒径团聚体为主,而在40—60cm土层中,总体上0.25mm粒径团聚体占据着主要地位;在0—20cm和20—40cm土层,稻田植茶后土壤团聚体水稳性逐年下降,由大到小依次为水稻田茶园5年茶园10年茶园15年,而在40—60cm土层,土壤团聚体水稳性由大到小依次为茶园5年茶园10年水稻田茶园15年,不同土层中团聚体的水稳性与0.25mm粒径团聚体含量呈正相关关系。稻田及稻田植茶后的土壤团聚体水稳性受土壤的理化性质影响,其中受0.25mm粒径团聚体含量、土壤容重、总孔隙度的影响较显著。就所测养分而言,稻田土壤团聚体的水稳性影响因素为有机质和游离氧化铁,茶园5年的影响因素为有机质和阳离子交换量(CEC),茶园10年的影响因素为有机质、CEC和有效磷含量,而茶园15年的影响因素主要是CEC含量。
[Abstract]:Using the method of field investigation and indoor analysis, the changes of water stability of soil aggregates after tea planting in rice fields in Mingshan area and its influencing factors were studied. The results showed that the content of soil water stable aggregates in paddy field and tea field was different among different grain sizes and soil layers. The content of soil water stable aggregates in paddy field, tea garden for 5 years and 10 years showed a tendency of decreasing first and then increasing with the decrease of grain size. The content of water stable aggregate in tea garden increased with the decrease of grain size. From different soil layers, in 0-20 ~ 40 cm soil layer, with the increase of tea planting time in paddy field, the content of soil aggregate changed from 2mm particle size aggregate to 0.25mm particle size aggregate, but in 40-60cm soil layer. In the soil layers of 0-20cm and 20-40cm, the water stability of soil aggregates decreased year by year, from big to small, the order was 5 years, 10 years, 15 years, and 15 years, but in the 40-60cm soil layer, the stability of soil aggregate decreased year by year in the soil layer of 0-20cm and 20-40cm, from big to small, it was 5 years, 10 years and 15 years of tea garden, respectively. The order of water stability of soil aggregate from big to small was 5 years tea garden 10 years paddy tea garden 15 years. The water stability of aggregates in different soil layers was positively correlated with 0.25mm particle size aggregate content. The water stability of soil aggregates after tea planting in paddy and paddy fields was affected by the physical and chemical properties of soil, especially by 0.25mm particle size aggregate content, soil bulk density and total porosity. For the measured nutrients, organic matter and free iron oxide were the influencing factors for water stability of soil aggregates in paddy fields, organic matter and cationic exchange capacity (CEC) were the influencing factors for 5 years in tea garden, and the influencing factors for 10 years in tea garden were organic matter CEC and available phosphorus content. CEC content was the main influencing factor in tea garden for 15 years.
【作者单位】：四川农业大学环境学院;四川农业大学资源学院;仁和区政府办公室;
【基金】：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)
【分类号】：S152.4

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