2000—2014年黄河源水分利用效率时空变化及其影响因素

刘潇忆; 刘超; 聂锐华; 金中武; 刘铁刚

引用本文:	刘潇忆,刘超,聂锐华,等.2000—2014年黄河源水分利用效率时空变化及其影响因素[J].灌溉排水学报,0,():-.
	LIU Xiaoyi,LIU Chao,NIE Ruihua,et al.2000—2014年黄河源水分利用效率时空变化及其影响因素[J].灌溉排水学报,0,():-.

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2000—2014年黄河源水分利用效率时空变化及其影响因素
刘潇忆¹, 刘超¹, 聂锐华¹, 金中武², 刘铁刚¹
1.四川大学;2.长江科学院

摘要:

【目的】探讨黄河源生态系统WUE变化趋势及其影响因素。【方法】基于MODIS遥感数据定量估算了2000—2014年黄河源植被水分利用效率，并采用趋势分析和相关分析等方法，研究了生态系统WUE时空动态变化特征及其对水热和植被因子的响应。【结果】2000—2014年黄河源WUE均值为0.59 ± 0.35 gC/（m2·mm），空间上由西向东呈增加趋势，时间上呈不显著增加趋势（p > 0.05）。其中，WUE显著增加的区域比例为30.29%，主要分布在黄河源西部和北部，主要覆盖类型为中、低覆盖度草地和耕地。黄河源生态系统WUE对水热因子和叶面积指数的敏感程度具有明显的空间异质性。【结论】在气候暖湿化影响下，水热和植被条件较差的中、低覆盖度草地WUE对植被改善有更高的敏感性。

关键词: 黄河源；水分利用效率；叶面积指数；降水；气温；敏感性

DOI：

分类号:TV11; X171.1

基金项目:国家重点研发计划项目；国家自然科学基金项目（面上项目，重点项目，重大项目）

Spatial-temporal variations in water use efficiency and its drivers in the source region of the Yellow River during 2000 and 2014

LIU Xiaoyi¹, LIU Chao¹, NIE Ruihua¹, JIN Zhongwu², LIU Tiegang¹

1.Sichuan University;2.Yangtze River Scientific Research Institute

Abstract:

【Objective】The objective is to explore the variations of WUE and its influencing factors in the SRYR.【Method】Based on MODIS remote sensing data, we quantitatively estimated the ecosystem WUE in the SRYR from 2000 to 2014. Then we investigated the spatial-temporal dynamics of ecosystem WUE and examined its underlying drivers, using trend analysis and correlation analysis.【Result】The mean annual WUE showed an increasing trend from west to east, with the average value of 0.59 ± 0.35 gC/(m2·mm) in the SRYR during 2000 and 2014. WUE showed a non-significant increasing trend (p > 0.05) during the study period. The proportion of areas with significant increases in WUE was 30.29%, mainly distributed in the western and northern parts of the SRYR, with the main cover types being medium and low coverage grassland and farmland. The significant spatial variability was found in the sensitivity of WUE to hydrothermal factors and leaf area index.【Conclusion】In the context of climate warming and wetting, vegetation improvement in medium and low coverage grasslands had a more significant enhancement of WUE.

Key words: The source region of the Yellow River; Water use efficiency; Leaf area index; Precipitation; Temperature; Sensitivity