Tracking Ecosystem Water Use Efficiency of Cropland by Exclusive Use of MODIS EVI Data
文献类型：期刊论文
| 作者 | Tang, Xuguang1; Li, Hengpeng1; Griffis, Tim J.1; Xu, Xibao1; Ding, Zhi1; Liu, Guihua1 |
| 刊名 | REMOTE SENSING
 |
| 出版日期 | 2015 |
| 卷号 | 7期号:9 |
| 关键词 | water use efficiency cropland MODIS vegetation index GPP ET |
| 通讯作者 | Tang, XG (reprint author), Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Watershed Geog Sci, Nanjing 210008, Jiangsu, Peoples R China. |
| 英文摘要 | One of the most important linkages that couple terrestrial carbon and water cycles is ecosystem water use efficiency (WUE), which is relevant to the reasonable utilization of water resources and farming practices. Eddy covariance techniques provide an opportunity to monitor the variability in WUE and can be integrated with Moderate Resolution Imaging Spectroradiometer (MODIS) observations. Scaling up in situ observations from flux tower sites to large areas remains challenging and few studies have been reported on direct estimation of WUE from remotely-sensed data. This study examined the main environmental factors driving the variability in WUE of corn/soybean croplands, and revealed the prominent role of solar radiation and temperature. Time-series of MODIS-derived enhanced vegetation indices (EVI), which are proxies for the plant responses to environmental controls, were also strongly correlated with ecosystem WUE, thereby implying great potential for remote quantification. Further, both performance of the indirect MODIS-derived WUE from gross primary productivity (GPP) and evapotranspiration (ET), and the direct estimates by exclusive use of MODIS EVI data were evaluated using tower-based measurements. The results showed that ecosystem WUE were overpredicted at the beginning and ending of crop-growth periods and severely underestimated during the peak periods by the indirect estimates from MODIS products, which was mainly attributed to the error source from MODIS GPP. However, a simple empirical model that is solely based on MODIS EVI data performed rather well to capture the seasonal variations in WUE, especially for the growing periods of croplands. Independent validation at different sites indicates the method has potential for broad application. |
| 研究领域[WOS] | Remote Sensing |
| 收录类别 | SCI ; EI |
| 语种 | 英语 |
| WOS记录号 | WOS:000362511400001 |
| 源URL | [http://ir.ceode.ac.cn/handle/183411/38390]  |
| 专题 | 遥感与数字地球研究所_SCI/EI期刊论文_期刊论文 |
| 作者单位 | 1.[Tang, Xuguang 2.Li, Hengpeng 3.Xu, Xibao] Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Watershed Geog Sci, Nanjing 210008, Jiangsu, Peoples R China 4.[Tang, Xuguang] Chinese Acad Sci, Inst Remote Sensing & Digital Earth, State Key Lab Remote Sensing Sci, Beijing 100101, Peoples R China 5.[Griffis, Tim J.] Univ Minnesota, Dept Soil Water & Climate, St Paul, MN 55108 USA 6.[Ding, Zhi] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China 7.[Liu, Guihua] Jiangxi Normal Univ, Minist Educ, Key Lab Poyang Lake Wetland & Watershed Res, Nanchang 330022, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tang, Xuguang,Li, Hengpeng,Griffis, Tim J.,et al. Tracking Ecosystem Water Use Efficiency of Cropland by Exclusive Use of MODIS EVI Data[J]. REMOTE SENSING,2015,7(9). |
| APA | Tang, Xuguang,Li, Hengpeng,Griffis, Tim J.,Xu, Xibao,Ding, Zhi,&Liu, Guihua.(2015).Tracking Ecosystem Water Use Efficiency of Cropland by Exclusive Use of MODIS EVI Data.REMOTE SENSING,7(9). |
| MLA | Tang, Xuguang,et al."Tracking Ecosystem Water Use Efficiency of Cropland by Exclusive Use of MODIS EVI Data".REMOTE SENSING 7.9(2015). |
入库方式： OAI收割
来源：遥感与数字地球研究所
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