采用RS和GIS技术,基于Landsat 8 OLI数据和野外调查成果,探究了伊犁河流域植被与地形地貌、地下水埋深及总溶体固体(TDS)定量关系。结果表明:①沼泽平原、冲洪积细土平原、缓倾斜含砾细土平原、黄土丘陵、风积沙丘及强倾斜砾质平原区植被生长状况依次变差。②高程750 m及2 800 m左右植被生长状况较好。③当地下水矿化度＞1 000 mg/L后,植被生长状况与地下水矿化度负相关,相关系数为0.733 5。④在人类活动干扰较小的情况下,地下水埋深在0~4.3 m范围内与植被生长状况呈二次函数关系,相关系数为0.764 8,适宜植被生长的地下水埋深为1.2~4.3 m;当地下水埋深为2.8 m左右时,植被长势最好。研究结果为流域生态环境保护、水资源合理开发利用、水资源科学管理提供技术支撑。
Abstract
The quantitative relations of vegetation with topography, groundwater depth and total dissolved solid(TDS) in Yili River Valley are examined using RS and GIS technologies based on Landsat 8 OLI data and field investigation achievements. Results reveal that: (1) Vegetation growth gradually worsens in the order from swamp plain, alluvial and fluvial fine soil plain, gently sloping gravel fine soil plain, loess hills, aeolian dune to strongly inclined gravel plain area. (2) Vegetation growth at the elevation around 750 m and 2 800 m is sound. (3) When TDS in groundwater is higher than 1 000 mg/L, vegetation growth is negatively correlated with groundwater salinity, with the coefficient of correlation up to 0.733 5. (4) Under small disturbance of human activities, the relationship of groundwater depth(within 0-4.3 m) and vegetation growth was quadratic,with the coefficient of correlation reaching 0.764 8. Groundwater depth within the range of 1.2-4.3 m is favorable for vegetation growth; in particular, when groundwater is around 2.8 m, vegetation growth is the best
关键词
植被 /
地形地貌 /
地下水埋深 /
TDS /
伊犁河谷
Key words
vegetation /
topography /
groundwater depth /
TDS /
Yili River Valley
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基金
新疆伊犁河谷地下水资源及环境问题调查与评价项目(1212011220972);新疆伊犁河谷霍城-霍尔果斯口岸水文地质调查子项目(12120115046401)
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