Simulations on the conversion of blue water into green water in a typical karst rocky desertification area
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Abstract:
The leakage of large amount of precipitation was the main cause of surface water shortage in karst rocky desertification areas.The conversion of the leaking hard to use blue water into ecological green water for vegetation growth and utilization was a useful exploration to improve water resource utilization under current technical level.Based on the Blue Water & Green Water Theory and the Soil-Plant-Atmosphere Continuum (SPAC) Principle,the conversion of blue water into green water in non-urban areas of Guiyang city was simulated with the Water Cycle Model of EcoHAT System in this study.It was found that:(1) The green water in the study area accounted for less than 50% of the precipitation,which was far below the global average of 65%,and with great potential for conversion and utilization.(2) Increasing vegetation coverage and thickening soil layer could enhance the process converting the leakage blue water into ecological green water,and the effects of thickened soil layer was more significant than those of increasing vegetation.(3) If the vegetation coverage was increased to 56% or above,which was an threshed,the effects on leakage was then limited.The research results of this paper would provide an add value reference for improving water resources utilization in the similar rocky desertification areas.
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