干旱区平原水库下游盐渍化土壤光谱时空分布特征分析

发布时间：2018-06-06 22:23

本文选题：地统计学 + 土壤盐渍化　；参考：《土壤通报》2016年03期

【摘要】：以2002年、2007年Landsat5影像和2013年Landsat8影像为数据源,通过ENVI和Arc GIS对遥感影像进行校正和处理并提取采样点的土壤反射率盐分指数对12年来柳城子水库下游土壤盐渍化时空变化特征进行分析,结果表明:12002~2013年,土壤平均反射率盐分指数逐年升高2002年(0.164)2007年(0.183)2013年(0.206);2在0~1200 m范围内土壤SI1(盐分指数)表现为201320072002年,但在1200~2400 m变幅较小,各年盐渍化趋于稳定;32002、2007、2013年SI1具有强烈空间相关性,空间自相关变化尺度逐年增加,表明区域因素(地下水)对土壤盐渍化空间变异性影响逐渐增长并向下游不断扩展;4在研究时段内,由于水库蓄水量的增加(2007年库容由2002年4×106m~3扩建为6×106m~3),水库对下游土壤盐渍化的影响不断增强,导致其盐渍化程度逐渐加剧。2013年比2002年轻度、中度盐渍化土壤面积分别减少69.44%、37.57%,而重度盐渍化、盐土则从无到有分别增加了722589.71 m~2、1941395.51 m~2。不论是空间上,还是时间上,水库下游土壤盐渍化状况总体趋于更加恶化。
[Abstract]:Using Landsat5 images in 2002, 2007 and Landsat8 images in 2013 as data sources, Using ENVI and Arc GIS to correct and process remote sensing images and to extract the soil reflectance salt index of sampling points, the temporal and spatial variation characteristics of soil salinization in the lower reaches of Liuchengzi Reservoir during the past 12 years were analyzed. The results showed that the soil salinization occurred in the lower reaches of Liuchengzi Reservoir from 1992 to 2013. The average soil reflectance salt index increased year by year in 2002 (0.164) in 2007 (0.183) in 2013, the soil SI1 (salt index) in the range of 0 ~ 1200 m was 201320072002, but the variation was small at 1200 ~ 2400 m, the salinization tended to stabilize in 320022007, and in 2013 SI1 had strong spatial correlation. The scale of spatial autocorrelation increased year by year, which indicated that the influence of regional factors (groundwater) on the spatial variability of soil salinization gradually increased and extended to the lower reaches during the period of study. Due to the increase of reservoir water storage (the capacity of reservoir expanded from 4 脳 106m~3 in 2002 to 6 脳 106 mm3 in 2007, the effect of reservoir on soil salinization in the lower reaches of the reservoir is increasing continuously, resulting in the degree of salinization of the reservoir being increased gradually, and the degree of salinization in 2013 is slightly higher than that in 2002. The soil area of moderate salinization decreased 69.44%, while that of severe salinization increased by 722589.71 mm2, 1941395.51 mm2, respectively, from scratch to severe salinization. In both space and time, the soil salinization in the lower reaches of the reservoir tends to deteriorate.
【作者单位】：新疆大学资源与环境科学学院教育部绿洲生态重点实验室;北京联合大学应用文理学院城市系;
【基金】：国家自然科学基金(41171165) 北京市属高等学校高层次人才引进与培养计划项目(IDHT20130322)资助
【分类号】：S156.41

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