globalchange  > 气候变化与战略
DOI: 10.5194/hess-23-2077-2019
论文题名:
Does the Normalized Difference Vegetation Index explain spatial and temporal variability in sap velocity in temperate forest ecosystems?
作者: Dijke A.; Mallick K.; Teuling A.; Schlerf M.; Machwitz M.; Hassler S.; Blume T.; Herold M.
刊名: Hydrology and Earth System Sciences
ISSN: 1027-5606
出版年: 2019
卷: 23, 期:4
起始页码: 2077
结束页码: 2091
语种: 英语
Scopus关键词: Catchments ; Ecosystems ; Evapotranspiration ; Runoff ; Transpiration ; Vegetation ; Velocity ; Biophysical characteristics ; Enhanced vegetation index ; Negative correlation ; Normalized difference vegetation index ; Small scale variability ; Spatial and temporal variability ; Temperate deciduous forest ; Temperate forest ecosystems ; Forestry ; catchment ; deciduous forest ; forest ecosystem ; Landsat ; NDVI ; phenology ; sensor ; temperate forest ; temporal variation ; transpiration ; Belgium ; Luxembourg [Belgium]
英文摘要: Understanding the link between vegetation characteristics and tree transpiration is a critical need to facilitate satellite-based transpiration estimation. Many studies use the Normalized Difference Vegetation Index (NDVI), a proxy for tree biophysical characteristics, to estimate evapotranspiration. In this study, we investigated the link between sap velocity and 30 m resolution Landsat-derived NDVI for 20 days during 2 contrasting precipitation years in a temperate deciduous forest catchment. Sap velocity was measured in the Attert catchment in Luxembourg in 25 plots of 20×20 m covering three geologies with sensors installed in two to four trees per plot. The results show that, spatially, sap velocity and NDVI were significantly positively correlated in April, i.e. NDVI successfully captured the pattern of sap velocity during the phase of green-up. After green-up, a significant negative correlation was found during half of the studied days. During a dry period, sap velocity was uncorrelated with NDVI but influenced by geology and aspect. In summary, in our study area, the correlation between sap velocity and NDVI was not constant, but varied with phenology and water availability. The same behaviour was found for the Enhanced Vegetation Index (EVI). This suggests that methods using NDVI or EVI to predict small-scale variability in (evapo)transpiration should be carefully applied, and that NDVI and EVI cannot be used to scale sap velocity to stand-level transpiration in temperate forest ecosystems. © Author(s) 2019.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/162986
Appears in Collections:气候变化与战略

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作者单位: Dijke, A., Environmental Sensing and Modelling, Environmental Research and Innovation Department, Luxembourg Institute of Science and Technology (LIST), Belvaux, Luxembourg, Hydrology and Quantitative Water Management Group, Wageningen University Research, Wageningen, Netherlands, Laboratory of Geo-Information Science and Remote Sensing, Wageningen University Research, Wageningen, Netherlands; Mallick, K., Environmental Sensing and Modelling, Environmental Research and Innovation Department, Luxembourg Institute of Science and Technology (LIST), Belvaux, Luxembourg; Teuling, A., Hydrology and Quantitative Water Management Group, Wageningen University Research, Wageningen, Netherlands; Schlerf, M., Environmental Sensing and Modelling, Environmental Research and Innovation Department, Luxembourg Institute of Science and Technology (LIST), Belvaux, Luxembourg; Machwitz, M., Environmental Sensing and Modelling, Environmental Research and Innovation Department, Luxembourg Institute of Science and Technology (LIST), Belvaux, Luxembourg; Hassler, S., Institute of Water and River Basin Management, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany; Blume, T., Hydrology Section, GFZ German Research Centre for Geosciences, Potsdam, Germany; Herold, M., Laboratory of Geo-Information Science and Remote Sensing, Wageningen University Research, Wageningen, Netherlands

Recommended Citation:
Dijke A.,Mallick K.,Teuling A.,et al. Does the Normalized Difference Vegetation Index explain spatial and temporal variability in sap velocity in temperate forest ecosystems?[J]. Hydrology and Earth System Sciences,2019-01-01,23(4)
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