黑河流域植被水分利用效率时空变化特征及其与气候因子的关系

doi:10.7522/j.issn.1000-694X.2016.00065

摘要/Abstract

摘要： 利用中分辨率成像光谱仪（MODIS）产品总初级生产力（GPP）、蒸散发（ET）及气象数据估算了黑河流域植被水分利用效率（WUE），分析了WUE的时空变化及与气候因子的相关性。结果表明：2005-2014年黑河流域单位面积上多年平均GPP为314.44 gC·m^-2，ET为363.35 mm，多年平均植被WUE为1.15 gC·mm^-1H₂O·m^-2；黑河流域WUE总体呈由南向北递增的空间分布格局，年内呈现单峰型结构，WUE高值区分布在酒泉-临泽东西线上及额济纳斯荒漠河岸林地带，托勒的东南部地区为WUE低值区；黑河流域生态系统WUE具有明显的季节变化规律，表现为夏季 > 春季 > 秋季 > 冬季的特征，夏季为1.32 gC·mm^-1H₂O·m^-2，冬季为0.75 gC·mm^-1H₂O·m^-2；水分利用效率年均分布与倾向率的增加具有一定的对应关系，莺落峡、民乐一带是WUE的高值区也是整个流域倾向率快速增长区，在WUE稳定性方面，中下游绿洲区变化最为显著，上游高海拔区、中下游戈壁区变化不显著；WUE与年降水量、年平均气温以负相关为主，其中降水是影响植被WUE的主要因素，正相关的区域分布在山丹县、民乐县东部、肃南裕固族自治县南部湖泊区域，而气温只在下游绿洲区呈正相关。

关键词: 水分利用效率, 总初级生产力, 蒸散发, 黑河流域

Abstract: Accurate assessments of spatio-temporal variations in gross primary productivity (GPP),evapotranspiration (ET),and water use efficiency (WUE) play a crucial role in the evaluation of carbon and water balance as well as have considerable effects on climate change.Study found that the year mean value of GPP was 314.44 gC·m^-2,evapotranspiration was 363.35 mm,estimated on the basis of the average years of vegetation WUE 1.15 gC·mm^-1·m^-2,Heihe River Basin WUE showing increasing from south to north of the spatial distribution,the distribution of the year show a "single peak" type pattern;WUE high values distributed in Jiuquan-Linze stuff online and Ejin Andean desert riparian forest zone,while Tuole southeastern region was the WUE low area;Heihe River Basin ecosystem WUE has obviously seasonal variation,the performance of summer > spring > autumn > winter,features summer up 1.32 gC·mm^-1·m^-2;Increase water use efficiency and the distribution of annual trend rate has a certain relationship,Yingluoxia-folk music along the high water use efficiency bucket is also the entire basin area Fast trend rate of growth,in ecosystem WUE stability,River oasis area changes the most significant in the middle and lower reaches,upstream high-altitude and the middle and lower of the Gobi region does not change significantly;correlation between WUE and annual rainfall,the annual average temperature is main negative correlation,where rainfall is the major factor affecting vegetation WUE.WUE positively correlated with the regional distribution of water in Shandan County,east of Minle County,Sunan southern lakes region,while the temperature was positively correlated only oasis in the downstream area.

Key words: water use efficiency (WUE), gross primary production (GPP), evaptranspiration (ET), Heihe River Basin

中图分类号:

Q948.15

李肖娟, 张福平, 王虎威, 雷声剑, 高张. 黑河流域植被水分利用效率时空变化特征及其与气候因子的关系[J]. 中国沙漠, 2017, 37(4): 733-741.

Li Xiaojuan, Zhang fuping, Wang Huwei, Lei Shengjian, Gao Zhang. Analysis of the Spatio-Temporal Characteristics of Water Use Efficiency of Vegetation and Its Relationship with Climate in the Heihe River Basin[J]. JOURNAL OF DESERT RESEARCH, 2017, 37(4): 733-741.

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