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Spatio-temporal patterns of grassland evapotranspiration and water use efficiency in arid areas

机译:干旱地区草地蒸散量的时空格局与水分利用效率

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摘要

Understanding spatio-temporal patterns of grassland evapotranspiration (ET) and water use efficiency (WUE) in arid areas is important for livestock production and ecological conservation. Xinjiang, China, was used as an example in the Biome-BGC model to explore spatio-temporal patterns of grassland ET and WUE from 1979 to 2012 in arid areas. The ET ranked from high to low as follows: among seasons, summer (142.4 mm), spring (49.7 mm), autumn (45.9 mm) and winter (7.7 mm); among regions, the Tianshan Mountains (357.9 mm), northern Xinjiang (221.3 mm) and southern Xinjiang (183.2 mm); among grassland types, mid-mountain meadow (387.7 mm), swamp meadow (358.3 mm), typical grassland (343.9 mm), desert grassland (236.2 mm), alpine meadow (229.7 mm), and saline meadow (154.7 mm). The WUE ranked from high to low as follows: among seasons, summer (0.60 g C kg H2O-1), autumn (0.48 g C kg H2O-1) and spring (0.43 g C kg H2O-1); among regions, northern Xinjiang (0.73 g C kg H2O-1), the Tianshan Mountains (0.69 g C kg H2O-1) and southern Xinjiang (0.26 g C kg H2O-1); among grassland types, mid-mountain meadow (0.86 g C kg H2O-1), typical grassland (0.84 g C kg H2O-1), swamp meadow (0.77 g C kg H2O-1), saline meadow (0.52 g C kg H2O-1), alpine grassland (0.37 g C kg H2O-1) and desert grassland (0.34 g C kg H2O-1). In Xinjiang grasslands, the spatio-temporal ET patterns were more strongly influenced by precipitation than by temperature, whereas most high WUE values occurred when precipitation and temperature were relatively conducive to grass growth.
机译:了解干旱地区草地蒸散量(ET)和水分利用效率(WUE)的时空格局对于畜牧生产和生态保护非常重要。以中国新疆为例,以Biome-BGC模型为研究对象,探讨了1979年至2012年干旱地区草地ET和WUE的时空格局。 ET的排名从高到低依次为:夏季(142.4毫米),春季(49.7毫米),秋季(45.9毫米)和冬季(7.7毫米)。其中,天山(357.9毫米),新疆北部(221.3毫米)和新疆南部(183.2毫米);在草地类型中,中山草甸(387.7毫米),沼泽草甸(358.3毫米),典型草地(343.9毫米),沙漠草地(236.2毫米),高山草甸(229.7毫米)和盐碱草地(154.7毫米)。 WUE从高到低排名如下:夏季(0.60 g C kg H2O-1),秋季(0.48 g C kg H2O-1)和春季(0.43 g C kg H2O-1);其中新疆北部(0.73 g C kg H2O-1),天山(0.69 g C kg H2O-1)和新疆南部(0.26 g C kg H2O-1);在草地类型中,中山草甸(0.86 g C kg H2O-1),典型草地(0.84 g C kg H2O-1),沼泽草地(0.77 g C kg H2O-1),盐碱草地(0.52 g C kg H2O-1) -1),高寒草原(0.37 g C kg H2O-1)和沙漠草原(0.34 g C kg H2O-1)。在新疆草原,时空ET模式受降水的影响比受温度的影响更大,而大多数高WUE值发生在降水和温度相对有利于草木生长的时候。

著录项

  • 来源
    《Ecological research》 |2017年第4期|523-535|共13页
  • 作者单位

    Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Xinjiang, Peoples R China;

    Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi 830011, Xinjiang, Peoples R China;

    Xinjiang Univ, Sch Resources & Environm Sci, Urumqi 830046, Xinjiang, Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Evapotranspiration; Water use efficiency; Arid area; Biome-BGC; Spatio-temporal pattern;

    机译:蒸散量;水分利用效率;干旱区;生物群落-BGC;时空格局;水土流失;

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