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DOI	10.5194/hess-23-2077-2019
	Does the Normalized Difference Vegetation Index explain spatial and temporal variability in sap velocity in temperate forest ecosystems?
	Dijke A.; Mallick K.; Teuling A.; Schlerf M.; Machwitz M.; Hassler S.; Blume T.; Herold M.
发表日期	2019
ISSN	1027-5606
起始页码	2077
结束页码	2091
卷号	23 期号:4
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.
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]
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159696
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 (L...
推荐引用方式 GB/T 7714	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],2019,23(4).
APA	Dijke A..,Mallick K..,Teuling A..,Schlerf M..,Machwitz M..,...&Herold M..(2019).Does the Normalized Difference Vegetation Index explain spatial and temporal variability in sap velocity in temperate forest ecosystems?.Hydrology and Earth System Sciences,23(4).
MLA	Dijke A.,et al."Does the Normalized Difference Vegetation Index explain spatial and temporal variability in sap velocity in temperate forest ecosystems?".Hydrology and Earth System Sciences 23.4(2019).