不同干扰程度下土壤盐分和有机质空间变异特征

SPATIAL VARIATION CHARACTERISTICS OF SOIL SALINITY AND ORGANIC MATTER UNDER DIFFERENT DEGREES OF INTERFERENCE

为明确人类活动影响下土壤盐分和有机质的空间变化特征,对新疆阜康市土壤实地定点取样,基于GIS和地统计学方法,分析不同人为干扰程度下土壤盐分和有机质的相关性及空间变异特征。结果表明:1)随干扰程度的增加,土壤盐分含量逐渐增加,有机质含量逐渐减小,两者变异系数在15.45%～60.19%,均属中等变异;2)各干扰程度下土壤盐分和有机质的相关性为:相对无人为干扰区>人为干扰区>重度人为干扰区,相关系数分别为:-0.614、-0.412、0.043;3)干扰程度越大,土壤盐分和有机质受随机因素作用越来越强,相对无人为干扰区两者块基比为12.5%和9.68%,具有强烈的空间相关性;4)Kriging插值结果为:相对无人为干扰和人为干扰区土壤盐分高、有机质低分布区域具有一致性,重度人为干扰区两者分布复杂,关系不明显。研究结果可为盐渍土的改良利用及人类合理适度开垦提供参考。

In order to clarify the spatial variation characteristics of soil salinity and organic matter under the influence of human activities, based on GIS and geostatistical methods, this paper analyzed the correlation and spatial variation characteristics of soil salinity and organic matter under different degrees of human interference by sampling the soil in the site of Fukang City, Xinjiang. The results showed that: 1) with the increase of interference, the content of soil salinity increased gradually, while the organic matter content decreased gradually, and their coefficient of variation was between 15.45% and 60.19%, which was medium variation;2) under different disturbance degrees, the correlation between salinity and organic matter was in the sequence of area relatively free from human interference>area with human interference>area with heavy human interference, and the correlation coefficients were-0.614,-0.412, 0.043, respectively;3) the greater the interference degree, the stronger the effect of random factors on soil salinity and organic matter would be, and the block base ratio of soil salinity and organic matter was 12.5% and 9.68% respectively in area relatively free from human interference;4) Kriging interpolation results were: relatively unmanned interference and artificial disturbance areas the distribution areas of high soil salinity and low organic matter were consistent in area relatively free from human interference and in area with human interference, while in area with heavy human interference, the distribution was complex and the relationship was not so obvious. The results could provide a theoretical basis for the improvement and utilization of the saline soil and the reasonable and moderate reclamation of the soil.