Temporal and Spatial Dynamic of ET Based on MOD16A2 in Recent Fourteen Years in Xilingol Steppe

doi:10.11733/j.issn.1007-0435.2016.02.007

Acta Agrestia Sinica ›› 2016, Vol. 24 ›› Issue (2): 286-293.DOI: 10.11733/j.issn.1007-0435.2016.02.007

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Temporal and Spatial Dynamic of ET Based on MOD16A2 in Recent Fourteen Years in Xilingol Steppe

ZHANG Qiao-feng^1,2,3,4, LIU Gui-xiang², YU Hong-bo^1,3, BAO Yu-hai^1,3

1. College of Geographical Science, Inner Mongolia Normal University, Hohhot, Inner Mongolia 010022, China;
2. Institute of Grassland Research of Chinese Academy of Agricultural Sciences, Hohhot, Inner Mongolia 010010, China;
3. Inner Mongolia Key Laboratory of Remote Sensing and Geography Information System, Hohhot, Inner Mongolia 010022, China;
4. Inner Mongolia Laboratory of Disaster Prevention and Reduction and Ecological Safety Monitoring, Hohhot, Inner Mongolia 010022, China

Received:2015-02-07 Revised:2015-08-26 Online:2016-04-15 Published:2016-06-06

基于MOD16A2的锡林郭勒草原近14年的蒸散发时空动态

张巧凤^1,2,3,4, 刘桂香², 于红博^1,3, 包玉海^1,3

1. 内蒙古师范大学地理科学学院, 内蒙古呼和浩特 010022;
2. 中国农业科学院草原研究所, 内蒙古呼和浩特 010010;
3. 内蒙古自治区遥感与地理信息系统重点实验室, 内蒙古呼和浩特 010022;
4. 内蒙古防灾减灾与生态安全监测实验室, 内蒙古呼和浩特 010022

通讯作者: 刘桂香
作者简介:张巧凤(1978-),女,内蒙古土左旗人,博士研究生,讲师,主要从事3S应用和草地生态环境监测与风险评估研究,E-mail:zqf2099@163.com
基金资助:
中国农业科学院创新工程"草原非生物灾害防灾减灾团队"(CAAS-ASTIP-IGR2015-04);国家科技支撑计划子课题(2013BAK05B01)资助

Abstract

Abstract:

Temporal and spatial dynamic of evapotranspiration (ET) plays an important role in understanding the impact of water and heat on vegetation. In this study, MODIS MOD16A2 monthly data and meteorological data were applied to analyze the temporal and spatial dynamic of different grassland types in recent 14 years (from 2000 to 2013) in Xilingol steppe and the responses of ET to meteorological elements by using regression analysis, spatial variation analysis and correlation analysis. The results showed that the ET in spatial decreased from northeast and the southeast extension line to southwest in Xilingol steppe, and it followed order as meadow steppe > typical steppe and sandy vegetation > desert steppe, but the typical steppe and the sandy vegetation had no significant difference. The change trend of different types of grasslands was similar, peak in 2003, 2008 and 2012 and trough in 2009. ET in meadow steppe, typical steppe and the Xilingol steppe had the increasing trend; ET in desert steppe and sandy vegetation had a trend of decrease, but all changes were not significant. Spatial variation analysis showed that ET in Xilingol steppe was stable. The correlation analysis indicated that there were extremely significant positive correlation (P < 0.01) between ET and precipitation, NDVI, relative humidity and vapor pressure with gradually decreased coefficient which was all bigger than 0.83. However, there were no significantly negative correlation between ET and temperature and wind speed and sunshine hours with the coefficient of -0.51, -0.48 and -0.23, respectively.

Key words: MOD16A2, ET, Temporal and spatial dynamic, CV, NDVI, Meteorological elements

摘要：

蒸散发(Evapotranspiration,ET)的时空动态对理解水热对植被的影响具有重要作用。利用MODIS MOD16A2月产品数据和气象数据,通过回归分析、空间变异分析和相关分析等方法,研究锡林郭勒草原不同类型草地近14年(2000-2013年)的ET时空动态及ET对气象要素的响应。结果表明:锡林郭勒草原ET总体表现为由东北部和东南延线向西南部递减的规律,草甸草原 > 典型草原和沙地植被 > 荒漠草原,典型草原和沙地植被无显著差异。各类草原的ET变化趋势相近,均在2003年、2008年和2012年出现波峰,2009年出现波谷。草甸草原、典型草原和总体的ET均有增加趋势,荒漠草原和沙地植被的ET均有减小趋势,但变化均不显著。空间变异分析表明近14年锡林郭勒草原ET的空间变异状况较为稳定。ET与降水量、NDVI、相对湿度和水汽压均成极显著正相关(P < 0.01),相关系数依次降低但都大于0.83;ET与气温、风速和日照时数均为不显著负相关,相关系数分别为-0.51,-0.48和-0.23。

关键词: MOD16A2, 蒸散发, 时空动态, 变异系数, 植被指数, 气象要素

CLC Number:

S812

ZHANG Qiao-feng, LIU Gui-xiang, YU Hong-bo, BAO Yu-hai. Temporal and Spatial Dynamic of ET Based on MOD16A2 in Recent Fourteen Years in Xilingol Steppe[J]. Acta Agrestia Sinica, 2016, 24(2): 286-293.

张巧凤, 刘桂香, 于红博, 包玉海. 基于MOD16A2的锡林郭勒草原近14年的蒸散发时空动态[J]. 草地学报, 2016, 24(2): 286-293.

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Temporal and Spatial Dynamic of ET Based on MOD16A2 in Recent Fourteen Years in Xilingol Steppe

基于MOD16A2的锡林郭勒草原近14年的蒸散发时空动态

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