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cje ›› 2011, Vol. 30 ›› Issue (01): 177-182.

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Observation and simulation of soil unsaturated hydraulic conductivity in mountain region of upper Heihe River: A case study of Pailugou catchment.

TANG Zhen-xing, HE Zhi-bin**, LIU Hu   

  1. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Linze Inland River Research Station, Chinese Ecosystem Network Research, Lanzhou 730000, China
  • Online:2011-01-08 Published:2011-01-08

Abstract: In mountain region of upper Heihe River, the characteristic of soil water regime is of unsaturated, and thus, to accurately estimate the values of its topsoil unsaturated hydraulic conductivity (K10) is essential for ecohydrological modeling. Taking the Pailugou catchment in upper Heihe River as a case, its topsoil K10 values were measured, and simulated by the pedotransfer functions (PTFs) integrating with factors-soil mechanical composition, bulk density, and average particle size. The observedK10in forestland, grassland and bare land was 0.21±0.20, 0.20±0.16 and 0.93±0.63 cm·h-1, and its spatial variability coefficient was 0.95, 0.79 and 0.67, respectively. The simulatedK10 was sensitive to soil mechanical composition and bulk density, resulting in different estimation effect of different PTFs estimation models for different sites. Therefore, the PTFs estimation models should be tested before application. The PTFs estimation models of K10 for Pailugou catchment were fitted, with R2=0.76 and the sample geometric mean error ratio GMER=1.77, indicating that they were practically applicable in the study region.

Key words: Aquatic ectoenzyme, Red tide, Eutrophication, Alkaline phosphatase