新疆伊犁地区植被水分利用效率时空格局研究  

Temporal and spatial patterns of WUE in Yili,Xinjiang

作　　者：陈帅 昝梅[1] CHEN Shuai;ZAN Mei(School of Geography and Tourism,Xinjiang Normal University,Urumqi 830054,China)

机构地区：[1]新疆师范大学地理科学与旅游学院,乌鲁木齐830054

出　　处：《生态科学》2023年第2期127-138,共12页Ecological Science

基　　金：新疆维吾尔自治区自然科学基金(2017D01A55)。

摘　　要：分析新疆伊犁地区植被水分利用效率(WUE)的时空变化特征,为实现区域水资源可持续利用、生态环境可持续发展和区域生态系统保护等提供科学参考和数据基础。利用2000—2019年的MODIS NPP(净初级生产力)和MODIS ET(蒸散发)数据,对伊犁地区近20年的植被WUE进行估算,分析研究区植被WUE的年际变化和空间分布特征以及不同植被类型WUE的变化趋势,并对植被WUE年际变化趋势的显著性进行检验。探讨多年平均植被WUE的高值区、中值区、低值区的分布范围及变化情况,并结合MODIS Land Cover(土地覆盖类型)数据分析不同植被类型WUE的差异。结果表明:(1)2000—2019年伊犁地区植被WUE总体呈上升趋势,增长率为13.24%;研究区多年平均植被WUE呈现从东、南向西、北递增的趋势;多年平均植被WUE高值区、中值区和低值区面积占研究区总面积的53.30%、32.06%和1.82%。2000—2019年研究区植被WUE中值区分布范围减小,植被WUE高值区分布范围增加,而低值区的分布范围变化较小。(2)植被WUE呈现增加和减小趋势的面积分别占研究区总面积的63.99%和23.29%;在0.05的置信水平下,41.07%的植被WUE增加区和10.54%的植被WUE减小区通过了显著性检验;在0.01的置信水平下,仅29.36%的植被WUE增加区和7.43%的植被WUE减小区通过了显著性检验。(3)不同植被类型WUE的年际变化趋势基本一致,但年均植被WUE(g·mm^(-1)·m^(-2))呈现为农作物(0.80)>针叶林(0.74)>草地(0.70)>阔叶林(0.65)>稀疏植被(0.18);不同植被类型对研究区WUE的贡献率呈现为草地(59.83%)>农作物(32.55%)>针叶林(3.45%)>阔叶林(2.43%)>稀疏植被(0.91%)。总之,2000—2019年的20年间,伊犁地区植被WUE小幅上升,年均植被WUE为0.71 g·mm^(-1)·m^(-2),两大河谷地区的植被WUE总体比东部、南部山区高,草地和农作物的水分利用效率相对较高,为当地生态环境保护和社会经济发展做出了较大贡献。The spatial and temporal variation characteristics of vegetation water use efficiency(WUE)in Yili area of Xinjiang were analyzed to provide scientific reference and data basis for sustainable utilization of regional water resources,sustainable development of ecological environment and protection of regional ecosystem.By using MODIS net primary productivity(NPP)and MODIS evapotranspiration(ET)products from 2000 to 2019,both the inter–annual variation and spatial distribution characteristics of vegetation water use efficiency(WUE)were analyzed;vegetation WUE trend of different vegetation types and its significance were also examined.A further study was conducted by analyzing the distribution patterns and variation characteristics of vegetation WUE mean values at low,moderate,and high levels during 2000 and 2019.Finally,vegetation WUE values of different vegetation types were explored based on MODIS Land Cover product.The results are as follows.(1)Generally,vegetation WUE showed an increasing trend with an increasing rate of 13.24%in the past 20 years.An obvious uneven spatial distribution of vegetation WUE values existed among different regions,increasing from south and east to north and west.The WUE at high value area,moderate value area and low value area accounted for 53.30%,32.06%and 1.82%of the whole region,respectively.From the temporal perspective,regions with moderate vegetation WUE values were gradually changing into that with high vegetation WUE values,while regions with low vegetation WUE values presented a stable status from both total area and distribution extent aspects.(2)Annually analysis results show 63.99%of the WUE was under an increasing trend,23.29%in decreasing,and only 41.07%of the vegetation WUE increase area and 10.54%of the vegetation WUE decrease area passed the significance test at P<0.05 level.Meantime,only 29.36%of the WUE increase area and 7.43%of the WUE decrease area passed the significance test at P<0.01 level.(3)WUE values of different vegetation types showed a similar variation

关 键 词：水分利用效率 伊犁地区 遥感 时空变化 

分 类 号：P79[天文地球—海洋科学] Q948.1[生物学—植物学]