| Water transfersi mulation in SVAT system of farmland and forestland in the loess hilly region |
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| DOI：10.7606/j.issn.1000-7601.2008.04.04 |
| Key Words: SVAT system farmland forestland water transfer Coup Model loess hilly region |
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| Abstract: |
| In the loess hilly region in northern Shaanxi Province fromJune to September the Si multaneous Heat and Water （Coup Model） model was applied to si mulate and study water transfer of Soil-Vegetation-At mosphere Transfer （SVAT） systemin the acacia forest and the potato far mland．The si mulationindicated that during the experi mental period the interception quantity of potato was only 26．05％ of the acacia community．The total evaporation of far mland was greater than that of acacia forestland．The daily evaporation of far mland was obviously higher than that of acacia forestland before the middle of July and they were al most equal after the middle of July．The daily transpiration and its variation of acacia forestland were markedly greater than that of far mland and understory vegetation ．No surface runoff took place in far mland and acacia forestland．The deep percolation in far mland was 4．08 mm and that in acacia forestland was so little that it could be neglected ．The soil water storage of 600 cm depth in far mland increased by 89．79 mm while that in acacia forestland decreased by 16．34 mm．The water incomes of SVAT systemin far mland and acacia forestland both were 341．06 mm and the outgoing were 357．41 mm, 251．28 mm respectively e.g. the for mer was 1．42 times greater than the later．The utilization rate of precipitationin far mland and acacia forestland was 46．48％, 28．41％ respectively． The interception evaporation and transpiration in acacia forestland was 2．08 times larger than it in farmland which were the main reasons to lead to excessive consumption of the acacia community to soil water and a negative compensation phenomenon for soil water storage． |