泾惠渠灌区渠道衬砌对土壤有机质的影响及其空间变异性

发布时间：2018-03-01 22:25

本文关键词： 土壤有机质泾惠渠灌区衬砌渠道空间变异地统计学地理信息系统　出处：《排灌机械工程学报》2017年03期 　论文类型：期刊论文

【摘要】：为了解灌区渠道衬砌节水对土壤质量的影响,以陕西关中典型灌区泾惠灌区为研究对象,综合运用传统统计学、地统计学和GIS技术,研究了泾惠渠灌区干支渠衬砌渠道两侧土壤有机质(SOM)空间变异及土壤颗粒分布特征.结果表明:衬砌渠道两侧SOM质量比介于18.96~162.92 mg/kg,平均为86.07 mg/kg,其中,预制混凝土衬砌渠道两侧SOM质量比最高,现浇凝土衬砌和浆砌石衬砌其次,复合土工膜衬砌最低;地统计分析表明,研究区SOM的半方差函数可用指数模型进行最优拟合,变程为21.7 km,结构方差占总方差的比例为0.37,SOM表现出中等程度的空间依赖性,SOM质量比和土壤颗粒的kriging插值图表明,两者具有显著空间相关性.SOM的空间分布格局是随机性因素和结构性因素共同作用的结果.
[Abstract]:In order to understand the influence of canal lining water saving on soil quality in irrigation district, Jinghui Irrigation District, a typical irrigation district in Guanzhong, Shaanxi Province, was studied. Traditional statistics, geostatistics and GIS techniques were used synthetically. The spatial variation of soil organic matter (SOM) and the distribution characteristics of soil particles were studied in Jinghui canal irrigation area. The results showed that the mass ratio of SOM on both sides of the lining canal was between 18.96 mg / kg and 162.92 mg / kg, with an average of 86.07 mg / kg. The quality ratio of SOM on both sides of precast concrete lining is the highest, the cast-in-situ concrete lining and masonry lining are the second, and the composite geomembrane lining is the lowest. The geostatistical analysis shows that the semi-variance function of SOM in the study area can be fitted optimally by exponential model. The variation range is 21.7 km, and the ratio of structural variance to total variance is 0.37 km, which shows moderate spatial dependence on SSOM mass ratio and kriging interpolation of soil particles. The spatial distribution pattern of SOM is the result of both random and structural factors.
【作者单位】：西安理工大学水利水电学院;西北旱区生态水利工程国家重点实验室培育基地;西北农林科技大学水土保持研究所;黄土高原土壤侵蚀与旱地农业国家重点实验室;
【基金】：陕西省科技支撑项目(2013KJXX-38) 陕西省水利科技支撑计划项目(slkj2013-04) 陕西省自然科学基金资助项目(2015JQ 5161)
【分类号】：S27;S153.6

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