地理科学 ›› 2017, Vol. 37 ›› Issue (2): 274-282.doi: 10.13249/j.cnki.sgs.2017.02.014
收稿日期:
2016-03-07
修回日期:
2016-09-26
出版日期:
2017-02-25
发布日期:
2017-02-25
作者简介:
作者简介:张静(1981-),女,副教授,博士研究生,主要从事资源环境评价与GIS研究。E-mail:
基金资助:
Jing Zhang1,2(), Zhiyuan Ren1(
)
Received:
2016-03-07
Revised:
2016-09-26
Online:
2017-02-25
Published:
2017-02-25
Supported by:
摘要:
基于MOD16遥感产品,在数据精度验证的基础上,运用GIS统计法、线性趋势法等研究了2000~2014年汉江流域蒸散发的年际和年内变化规律及不同土地覆被类型下的蒸散发特征。结果表明:① 2000~2014年,潜在蒸散发(PET)多年平均值为1 476 mm,呈东南向西北递减态势;实际蒸散发(ET)多年平均值约654 mm,ET呈东低西高,南高北低态势。不同土地覆被类型下年均PET和ET大小顺序相反。② PET年际变化率为13.63 mm/a,呈弱增加趋势;ET年际变化率为-2.3 mm/a,呈弱减少趋势,表明汉江流域水资源呈减少趋势。PET空间上呈东增西减趋势,ET呈东减西增趋势,东北部具有干旱化倾向。③ 年内PET和ET呈单峰型。PET在6月最大,ET在7月最大,二者均在12月最小。二者在4~6月差距最大,形成春旱。不同土地覆被类型下PET和ET呈单峰型,植被生长季节ET差距大,林地增长速度最快。④ PET和ET具有较强的季节性。ET季节性空间差异非常显著,在于林地的植被蒸腾作用对全年ET贡献较大。流域西部山地ET季际增加趋势明显而东部呈减少趋势,整体上冬季年际变化最明显,春季最弱。
中图分类号:
张静, 任志远. 基于MOD16的汉江流域地表蒸散发时空特征[J]. 地理科学, 2017, 37(2): 274-282.
Jing Zhang, Zhiyuan Ren. Spatiotemporal Characteristics of Evapotranspiration Based on MOD16 in the Hanjiang River Basin[J]. SCIENTIA GEOGRAPHICA SINICA, 2017, 37(2): 274-282.
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