2000—2014年云南省陆地生态系统水分利用效率的时空变化
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TV122

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国家自然科学基金(51879067);江苏省杰出青年基金(BK20180022);江苏省“六大人才高峰”计划(NY-004)


Spatiotemporal variations of terrestrial ecosystem water use efficiency in Yunnan Province from 2000 to 2014
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    摘要:

    基于MODIS卫星遥感数据,计算了云南省2000—2014年陆地生态系统水分利用效率(WUE),结合国家气象站点的观测数据,采用趋势分析、EOF分析和相关性分析等方法,获取了云南省陆地生态系统WUE时空变化规律和主要驱动因子。结果表明:云南省陆地生态系统WUE空间分布差异明显,呈现南北低、中间高的格局,WUE在大部分地区呈现了明显的季节变化,而在低值区变化不显著;WUE年际变化趋势存在明显的南北差异,北方主要呈增加的趋势,南方主要呈减少的趋势,蒸散发是其变化的主导因素;WUE空间模态呈现南北反向分布模式,北方增加,南方减少,反之亦然;WUE驱动因子自北向南依次为相对湿度、最高温度和日照时数,相关关系呈现南北差异。

    Abstract:

    Based on the satellite remote sensing data of MODIS, water use efficiency(WUE)in Yunnan Province from 2000 to 2014 was calculated. Combined with the observation data of national meteorological stations, the spatiotemporal variations law of WUE and its main driving factors in Yunnan Province were got by adopting trend analysis, EOF analysis and correlation analysis. The results show that WUE shows apparent spatial gradients across Yunnan Province with lower values in the north and south and higher values in the middle. WUE also shows a clear seasonality in most of the areas, but it does not show strong seasonality in these areas with low WUE values. WUE shows differential trends over the past 15 years across the region with increasing trends dominating in the north and decreasing trends dominating in the south. Evapotranspiration is the dominant factor of its change. WUE spatial mode presents a reverse distribution pattern from north to south, increasing in the north and decreasing in the south, and vice versa. The driving factors of WUE are relative humidity, highest temperature and sunshine hours from north to south, and the correlation shows north-south difference.

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张珂,刘林鑫,晁丽君,等.2000—2014年云南省陆地生态系统水分利用效率的时空变化[J].水资源保护,2019,35(5):1-5.(ZHANG Ke, LIU Linxin, CHAO Lijun, et al. Spatiotemporal variations of terrestrial ecosystem water use efficiency in Yunnan Province from 2000 to 2014[J]. Water Resources Protection,2019,35(5):1-5.(in Chinese))

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  • 收稿日期:2019-05-14
  • 在线发布日期: 2019-09-24