【摘要】 干旱区水资源与植被生长状态的时空变化规律及其耦合关系的研究一直以来都是水文学和生态学等领域研究的重点和热点。以我国干旱区内陆河流域—疏勒河流域为研究区,利用2002—2016期间GRACE卫星反演的陆地水储量变化(TWSA)和MODIS的增强型植被指数(EVI)两个指标开展了基于像元的流域水资源和植被状态的时空格局变化及其耦合关系研究。结果表明:(1)在时间尺度上,疏勒河流域的TWSA和EVI表现出明显的周期性、季节性以及趋势性规律;(2)在空间尺度上,基于像元的流域TWSA和EVI均呈明显的空间异质性;(3)在时空耦合关系方面,年均TWSA与EVI在流域整体尺度上呈中度负相关;在子分区尺度上,中部平原区呈高度负相关,南部山区和北部山区相关性不显著;在像元尺度上,年均TWSA与EVI呈高度负相关、中度负相关、低度负相关的像元分别占全流域的19%、32%和31%;仅有18%的像元呈低度正相关,说明疏勒河流域的TWSA与EVI的时空耦合关系复杂且具有明显的空间异质性和尺度效应。研究结论将为疏勒河流域的水资源优化配置和合理开发利用,以及为实现干旱区的可持续发展提供科学依据。更多还原

【Abstract】 The spatio-temporal pattern changes between water resources and vegetation growth, and their coupling relationship have always been important issues in hydrology and ecology. This case study of Shule River Basin, which is a typical inland river basin in an arid area, investigated the spatio-temporal pattern changes in water resources and vegetation growth, and their coupling relationship. The terrestrial water storage anomaly(TWSA) inversed by the GRACE satellite was used along with the enhanced vegetation index(EVI) derived from the MODIS data for 2002 to 2016. The results indicate that(1) on a temporal scale, the TWSA and EVI of the basin show obvious periodicity, seasonality, and tendency;(2) on a spatial scale, the TWSA and EVI of the basin, based on grid cell size, show obvious spatial heterogeneity at the whole basin and sub-regional scales;(3) the coupling relationship analysis shows that there is a moderately negative correlation between annual average TWSA and the EVI across the whole basin and that there is a highly negative correlation in the central plain area. However, there is no significant correlation in the southern mountainous area and the northern mountainous area. The proportions of grid cells that have a highly negative correlation, a moderately negative correlation, and a low negative correlation between the TWSA and EVI are 19%, 32%, and 31% of the total, respectively. Only 18% show a low positive correlation. Therefore, the coupling relationships between annual average TWSA and EVI are complex and show the clear spatial heterogeneity and scale effects in the basin. The research conclusions could help optimize the allocation and rational utilization of water resources and ecologically sustainable development in the Shule River Basin and the arid regions of China.更多还原