CAJ | 학술논문

应用遥感和地统计学方法,分析敦煌绿洲土地利用/土地覆被变化对地下水位时空变异的影响,通过半变异函数模型、克里格插值拟合敦煌绿洲1987年和2008年地下水位时空变异性特征,结合遥感解译生成的1987年和2007年二期土地利用/土地覆被类型分类图,叠加分析不同地下水埋深变化与土地利用类型转移之间的关系。结果表明：人为因素对地下水位空间异质性变化有较大影响,1987-2007年间地下水位的最大自相关距离显著增大,地下水资源的连通性和脆弱性也在增加。耕作区、城建用地和无植被区面积增加,各类草地和灌木林地面积减少,生态环境有退化趋势。地下水时空变化与土地利用与覆被变化具有一定的响应关系。干旱区温度的升高对绿洲地下水位变化具有一定的影响,而耕地的增加、抽水灌溉、渠系衬砌、旅游业蓬勃发展等人类活动加大了耗水量,减少了地下水补给,占用了生态用水,是导致绿洲地下水位持续下降的主要原因。
응용요감화지통계학방법,분석돈황록주토지이용/토지복피변화대지하수위시공변이적영향,통과반변이함수모형、극리격삽치의합돈황록주1987년화2008년지하수위시공변이성특정,결합요감해역생성적1987년화2007년이기토지이용/토지복피류형분류도,첩가분석불동지하수매심변화여토지이용류형전이지간적관계。결과표명：인위인소대지하수위공간이질성변화유교대영향,1987-2007년간지하수위적최대자상관거리현저증대,지하수자원적련통성화취약성야재증가。경작구、성건용지화무식피구면적증가,각류초지화관목임지면적감소,생태배경유퇴화추세。지하수시공변화여토지이용여복피변화구유일정적향응관계。간한구온도적승고대록주지하수위변화구유일정적영향,이경지적증가、추수관개、거계츤체、여유업봉발발전등인류활동가대료모수량,감소료지하수보급,점용료생태용수,시도치록주지하수위지속하강적주요원인。
Based on the remote sensing and geo-statistical methods, the semivariogram and Kriging interpola-tion were used to fit the spatio-temporal pattern of groundwater depth in the study area for the period of 1987 to 2008. Overlaying the corresponding land use and land cover change (LUCC) from remote sensing images, we analyzed the relationship between LUCC and the spatio-temporal variations of groundwater in the Dunhuang Oasis, Northwest China. The results show that, under a greater influence from human activities, the maximum autocorrelation distance increased significantly, suggesting the connectivity and vulnerability of groundwater was rising. Over the study period, areas of the farming, urban, and barren land had all increased, while the grassland had sharply deteriorated. Groundwater spatial changes and the LUCC had a certain response relationship, while the rising air temperate, increasing agricultural irrigation and expanding tourism had all resulted in increasing water consumption, decreasing groundwater recharge and taking most of the ecological water demand. This eventually caused the groundwater level to decline.