2000—2014年中亚地区主要植被类型水分利用效率特征

doi:10.11707/j.1001-7488.20190320

Abstract

Abstract: [Objective] The mean water use efficiency (WUE) of different vegetation types were compared in Central Asia. Based on this, the altitudinal and latitudinal distribution of WUE were characterized, and the variation trend of WUE within and among the years were analyzed, in order to revealfrom a macro perspective the temporal and spatial variation of WUE in different vegetation types in Central Asia.[Methods]The land cover data was used to integrate different vegetation type classifications, and the MODIS product data primary productivity (GPP) and evapotranspiration (ET) were used to calculate the monthly average and annual average WUE, the WUE changes at different altitudes and latitudes were observed.[Results]1) The lower GPP ecosystem has higher WUE, and vice versa. The WUEs of different vegetation types were ranked in the order:open shrub land > grassland > closed shrub land > forest > cropland, the open shrub land WUE was significantly greater than those of the other vegetation types (P<0.05). The WUE of different vegetation types varied strongly with the altitude:it appeared relatively constant as the altitude varies from 0 to 1 200 m and then decreased dramatically above 1 200 m. The high WUEs appeared in farmland, forest, closed shrub land, open shrub land, grassland at altitudes of 750, 750, 750, 1 250, and 500 m, respectively. WUE exhibits large variability with latitude. The peak WUE appeared at latitude of is 36(farmland), 32(close shrub land), 36-38(open shrub land), 50(forest), 32(grassland) respectively. From 2000 to 2014, the average WUE was 2.65 g·kg^-1 in Central Asia, and tended to increase as an overall trend. The annual increase was 0.066 g·kg^-1; the monthly variation of WUE appeared increase first followed by a decrease, this can be well described by a one-dimensional cubic function.[Conclusion]With the increase of altitude, WUE showed a trend of increase first and then followed by a decrease. The WUE of different vegetation types showed different trends with the increase of latitude, and an upward trend from 2000 to 2014.

Key words: water use efficiency, Central Asian, vegetation types, water and carbon cycles

CLC Number:

S717.19

Zou Jie, Ding Jianli. Changes of Water Use Efficiency of Main Vegetation Types in Central Asia from 2000 to 2014[J]. Scientia Silvae Sinicae, 2019, 55(3): 175-182.

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Changes of Water Use Efficiency of Main Vegetation Types in Central Asia from 2000 to 2014

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