多伦县草原植被覆盖与蒸散量时空变化及其关系

doi:10.6046/gtzyyg.2020.01.27

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研究内蒙古退化草地的蒸散变化,有利于了解该地区退化草地生态系统水循环,并对该地区草地的水资源合理利用提供重要依据。本研究以内蒙古多伦县为研究对象,利用2001—2017年间生长茂盛期的MODIS数据反演了近17 a该区域植被覆盖度及其日蒸散量的空间分布和变化规律,分析了土地利用和草地退化对蒸散量的影响。结果表明: ①不同土地利用类型的植被覆盖度从大到小的顺序为: 林地>农田>居民建设用地>草地>未利用地>水域,不同土地利用类型的日蒸散量从大到小的顺序为: 水域>林地>农田>居民建设用地>草地>未利用地; ②2001—2017年间多伦县草地类型以第Ⅲ和Ⅳ等级的草地为主,低等级草地面积有下降的趋势,而优质草地面积有上升的趋势,说明该地区对草原的保护性措施有一定的成效; ③2001—2017年间,各等级草地日蒸散量总体无明显变化趋势。除个别年份外,植被覆盖度与日蒸散量呈现一致的年际波动; ④综合植被覆盖度与日蒸散量的时空分布格局,分析得出植被覆盖与日蒸散量具有一定的正相关性。

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	程宇琪
	王雨晴
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	张成福

关键词 ： MODIS, 草地等级, 植被覆盖度, SEBAL模型, 日蒸散量

Abstract：

Studying the changes of evapotranspiration of degraded grassland in Inner Mongolia is conducive to understanding the water cycle of the degraded grassland ecosystem in this region and provides an important basis for the rational use of grassland water resources in this region. In this study, Duolun County in Inner Mongolia was taken as the research object. MODIS data during the flourishing period from 2001 to 2017 were used to invert the spatial distribution and variation of vegetation coverage and daily evapotranspiration in this region for nearly 17 years, and the effects of land use and grassland degradation on evapotranspiration were analyzed. Some conclusions have been reached: ① The order of vegetation coverage of different land use types is forest land >farmland>residential construction land>grassland>unused land>water area; the order of daily evapotranspiration of different land use types is water area>forest land>farmland >residential construction land>grassland>unused land. ② From 2001 to 2017, the grassland types in Duolun County are mainly of the III and IV grades; the area of low-grade grassland has a downward trend, while the area of high-quality grassland has an upward trend, which indicates that the protective measures for grassland in this area achieved certain results. ③ During 2001-2017, there was no obvious change trend in the daily evapotranspiration of all grassland grades; except for a few years, vegetation coverage and daily evapotranspiration showed consistent interannual fluctuations. ④ According to the spatial and temporal distribution pattern of vegetation coverage and daily evapotranspiration, it is concluded that there is a positive correlation between vegetation coverage and daily evapotranspiration.

Key words： MODIS grassland grade vegetation coverage SEBEL model daily evapotranspiration

收稿日期: 2019-01-04 出版日期: 2020-03-14

TP79

基金资助:内蒙古农业大学人才引进基金项目“内蒙古农业大学引进人才科研启动项目”(编号: YJ2014-1);国家自然科学基金项目“中阿土地退化/荒漠化与生态系统修复双边研讨会”(编号: RZ1900003711)

通讯作者: 张成福

作者简介: 程宇琪(1994-),女,硕士研究生,研究方向为水土保持与荒漠化防治。Email: 851932417@qq.com。

引用本文:

程宇琪, 王雨晴, 孙静萍, 张成福. 多伦县草原植被覆盖与蒸散量时空变化及其关系[J]. 国土资源遥感, 2020, 32(1): 200-208.
Yuqi CHENG, Yuqing WANG, Jingping SUN, Chengfu ZHANG. Temporal and spatial variation of evapotranspiration and grassland vegetation cover in Duolun County, Inner Mongolia. Remote Sensing for Land & Resources, 2020, 32(1): 200-208.

链接本文:

https://www.gtzyyg.com/CN/10.6046/gtzyyg.2020.01.27 或 https://www.gtzyyg.com/CN/Y2020/V32/I1/200

Fig.1 研究区地理位置及概况

Fig.2 研究区土地利用类型及各土地利用类型面积比

Tab.1 多伦县草地等级划分标准

Fig.3 2001—2017年间研究区植被覆盖度和日蒸散量均值空间分布

Fig.4 2001—2017年间研究区不同土地利用类型平均植被覆盖度及平均日蒸散量变化

Fig.5 2001—2017年研究区各等级草地空间分布及各草地等级面积比

Fig.6 2001—2017年研究区不同等级草地面积变化趋势

Fig.7 2001—2017年研究区草地日蒸散量空间分布及各等级草地日蒸散量变化

Fig.8 2001—2017年研究区不同等级草地日蒸散量逐年变化趋势

Fig.9 2001—2017年研究区植被覆盖度及日蒸散量年际动态变化

Fig.10 2001—2017年研究区8月份降水量和降水日数变化

Fig.11 2001—2017年研究区植被覆盖度和日蒸散量的关系

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