Abstract
Landcover change alters not only the surface landscape but also regional carbon and water cycling. The objective of this study was to assess the potential impacts of landcover change across the Kansas River Basin (KRB) by comparing local microclimatic impacts and regional scale climate influences. This was done using a 25-year time series of Normalized Difference Vegetation Index (NDVI) and precipitation (PPT) data analyzed using multi-resolution information theory metrics. Results showed both entropy of PPT and NDVI varied along a pronounced PPT gradient. The scalewise relative entropy of NDVI was the most informative at the annual scale, while for PPT the scalewise relative entropy varied temporally and by landcover type. The relative entropy of NDVI and PPT as a function of landcover showed the most information at the 512-day scale for all landcover types, implying different landcover types had the same response across the entire KRB. This implies that land use decisions may dramatically alter the local time scales of responses to global climate change. Additionally, altering land cover (e.g., for biofuel production) may impact ecosystem functioning at local to regional scales and these impacts must be considered for accurately assessing future implications of climate change.
Highlights
Vegetation is a key variable of interaction between the land and atmosphere
This study demonstrated the variation in vegetation across temporal scale as a function of landcover types in the Kansas River Basin (KRB)
We examined how the different regions in this basin were governed by microclimatic impacts of land cover type versus regional climate forcings
Summary
Vegetation is a key variable of interaction between the land and atmosphere. Vegetation is highly sensitive to precipitation and/or temperature, which depends on the region under consideration [1,2]. The central US Great Plains are a leading producer of wheat, sorghum and a significant amount of corn and soybeans. Production of corn for ethanol can reduce petroleum use by about 95% on an energetic basis [3]. Food production and energy needs are competing pressures that alter decisions concerning the type of crops to produce. These landcover changes will have spatially and temporally varying environmental impacts, such as altering water cycling in this region
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