绿洲-荒漠过渡带土壤蓄水量的空间分布及其时间稳定性
发布时间：2018-10-07 21:05
【摘要】：掌握土壤水分动态变化规律是绿洲地区水资源管理与生态建设的关键.本文在黑河中游绿洲与荒漠交错地带设置面积约50 km~2的研究区域,持续监测2012—2014年间植被生长季节土壤水分含量,利用地统计分析与时间稳定性分析探索土壤水分的时空分布特征.结果表明:黑河北岸绿洲-荒漠过渡带土壤蓄水量8月最大、10月最小,0~2 m土层土壤平均蓄水厚度约367 mm.绿洲-荒漠过渡带土壤水分梯度除受河流影响外,还与土地利用方式密切相关.不同土地利用类型土壤蓄水量依次为农地乔木林地灌木林地荒漠,农地土壤蓄水量平均高出外围荒漠土壤蓄水量300%以上.研究区内各采样点土壤水分时间稳定性具有明显的空间差异,不同土地利用类型土壤水分稳定程度依次为灌木林地荒漠农地乔木林地.河流对沿岸绿洲土壤水分的直接影响集中在3 km以内,在河岸绿洲与新垦沙地农田之间存在一条土壤水分较为稳定的样带,可以用于指示绿洲生态系统的发展与演变.
[Abstract]:It is the key to the management and ecological construction of water resources in oasis area to master the law of dynamic change of soil moisture. In this paper, a study area of about 50 km~2 was established in the Oasis and desert ecotone in the middle reaches of Heihe River to continuously monitor the soil moisture content in the vegetation growing season from 2012 to 2014. The temporal and spatial distribution characteristics of soil moisture were studied by geostatistical analysis and time stability analysis. The results show that the soil water storage in the oasis desert transitional zone on the north bank of Heihe River is the largest in August, and the average soil water storage thickness in October is about 367 mm.. The soil moisture gradient in the oasis-desert transitional zone is closely related to the land use patterns in addition to the influence of rivers. The order of soil water storage in different land use types is the desert of farmland Arbor woodland and shrub forest. The average soil water storage of farmland is more than 300% higher than that of peripheral desert soil. The temporal stability of soil moisture in different sampling sites was significantly different. The degree of soil moisture stability of different land use types was in turn shrub land desert farmland Arbor forest land. The direct effect of river on soil moisture in oasis is within 3 km. There is a stable soil moisture sample between riparian oasis and newly cultivated sandy land, which can be used to indicate the development and evolution of oasis ecosystem.
【作者单位】： 西北农林科技大学资源环境学院;西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室;中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室;中国科学院地理科学与资源研究所陆地水循环与地表过程重点实验室;
【基金】：国家自然科学基金项目(91025018,41530854)资助~~
【分类号】：S152.7
本文编号：2255666
[Abstract]:It is the key to the management and ecological construction of water resources in oasis area to master the law of dynamic change of soil moisture. In this paper, a study area of about 50 km~2 was established in the Oasis and desert ecotone in the middle reaches of Heihe River to continuously monitor the soil moisture content in the vegetation growing season from 2012 to 2014. The temporal and spatial distribution characteristics of soil moisture were studied by geostatistical analysis and time stability analysis. The results show that the soil water storage in the oasis desert transitional zone on the north bank of Heihe River is the largest in August, and the average soil water storage thickness in October is about 367 mm.. The soil moisture gradient in the oasis-desert transitional zone is closely related to the land use patterns in addition to the influence of rivers. The order of soil water storage in different land use types is the desert of farmland Arbor woodland and shrub forest. The average soil water storage of farmland is more than 300% higher than that of peripheral desert soil. The temporal stability of soil moisture in different sampling sites was significantly different. The degree of soil moisture stability of different land use types was in turn shrub land desert farmland Arbor forest land. The direct effect of river on soil moisture in oasis is within 3 km. There is a stable soil moisture sample between riparian oasis and newly cultivated sandy land, which can be used to indicate the development and evolution of oasis ecosystem.
【作者单位】： 西北农林科技大学资源环境学院;西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室;中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室;中国科学院地理科学与资源研究所陆地水循环与地表过程重点实验室;
【基金】：国家自然科学基金项目(91025018,41530854)资助~~
【分类号】：S152.7
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