方正县土壤全硒空间变异研究

发布时间：2018-05-24 06:20

本文选题：方正县 + 土壤全硒　；参考：《中国土壤与肥料》2016年01期

【摘要】：为了明确富硒水稻主产县方正县土壤中全硒的含量、分布等特征,以方正县农业土壤为研究对象,运用地统计学和Arc GIS相结合的方法研究土壤全硒含量的空间异质性和分布格局,并探讨硒浓度变异与土壤理化性质之间的关系。结果表明,土壤全硒含量变异函数符合指数模型,空间异质性指数Q=0.125,说明全硒含量的变异主要由结构性因素引起,空间自相关性较强。用普通克里格法(OK法)绘制全县的土壤全硒分布图,发现研究区绝大多数土壤(69.3%)属于足硒土壤,硒含量高值区出现在研究区中部及西南部,而低值区主要分布在研究区东北部。不同土壤类型中,泥炭土全硒含量最高(0.267 mg·kg-1),而沼泽土全硒含量最低(0.153 mg·kg-1);不同土地利用方式下,稻田土全硒含量(0.230 mg·kg-1)略高于旱地土(0.217 mg·kg-1)。影响土壤全硒含量的主要因素为土壤有机碳、粘粒及粉粒含量。
[Abstract]:In order to determine the content and distribution of total selenium in the soil of Fangzheng County, the agricultural soil of Fangzheng County was used as the research object. The spatial heterogeneity and distribution pattern of total selenium content in soil were studied by means of geostatistics and Arc GIS, and the relationship between the variation of selenium concentration and the physical and chemical properties of soil was discussed. The results showed that the variation function of soil total selenium content was in accordance with the exponential model, and the spatial heterogeneity index was 0.125, which indicated that the variation of total selenium content was mainly caused by structural factors, and the spatial autocorrelation was strong. The distribution map of soil total selenium in the whole county was drawn by using the ordinary Kriging method. It was found that most of the soils in the study area belonged to sufficient selenium. The high value area of selenium content appeared in the middle and southwest of the study area, while the low value area mainly distributed in the northeast of the study area. Among different soil types, the total selenium content of peat soil was the highest (0.267 mg 路kg ~ (-1), while that of marsh soil was the lowest (0.153 mg / kg ~ (-1), and that of paddy soil was 0.230 mg / kg ~ (-1), which was slightly higher than that of dry land soil (0.217 mg 路kg ~ (-1). The main factors affecting soil total selenium content were soil organic carbon, clay and silt content.
【作者单位】：东北农业大学;黑龙江省农业科学院土壤肥料与环境资源研究所/黑龙江省土壤环境与植物营养重点实验室;黑龙江省方正县农业技术推广中心;
【基金】：公益性行业(农业)科研专项经费(201303106)
【分类号】：S158

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