【摘要】 基于野外试验资料,应用CoupModel模型,对陕北黄土丘陵区2006年6~9月份农地(马铃薯)、林地(刺槐林)SVAT系统水分传输进行了模拟。研究结果表明:6~9月份农地作物截留降水仅为刺槐林群落的26.05%;农地蒸发量大于刺槐林地,7月中旬以前农地日蒸发量明显高于刺槐林地,7月中旬以后二者基本相等;刺槐蒸腾量显著高于刺槐林下植被和农地马铃薯,而且日变幅较大;农地和刺槐林地均没有发生地表径流;农地土壤深层渗漏4.08 mm,刺槐林地深层渗漏极小,可忽略不计;农地0~600 cm土层增加储水量89.79 mm,而刺槐林地减少16.34 mm,出现负补偿现象;SVAT系统中,刺槐林地和农地水分收入均为341.06 mm,支出分别为357.41mm和251.28 mm,刺槐林地是农地的1.42倍;刺槐林和农地作物对降水的利用率分别为46.48%和28.41%;刺槐林的截留蒸发量和蒸腾量是农地的2.08倍,显著大于农地,是导致刺槐林群落过度消耗土壤储水而呈现负补偿现象的主要原因。更多还原

【Abstract】 In the loess hilly region in northern Shaanxi Province from June to September,the Simultaneous Heat and Water(CoupModel) model was applied to simulate and study water transfer of Soil-Vegetation-Atmosphere Transfer(SVAT) system in the acacia forest and the potato farmland.The simulation indicated that during the experimental period the interception quantity of potato was only 26.05% of the acacia community.The total evaporation of farmland was greater than that of acacia forestland.The daily evaporation of farmland was obviously higher than that of acacia forestland before the middle of July and they were almost equal after the middle of July.The daily transpiration and its variation of acacia forestland were markedly greater than that of farmland and understory vegetation.No surface runoff took place in farmland and acacia forestland.The deep percolation in farmland was 4.08mm and that in acacia forestland was so little that it could be neglected.The soil water storage of 600 cm depth in farmland increased by 89.79 mm while that in acacia forestland decreased by 16.34 mm.The water incomes of SVAT system in farmland and acacia forestland both were 341.06 mm,and the outgoing were 357.41 mm,251.28 mm respectively e.g.the former was 1.42 times greater than the later.The utilization rate of precipitation in farmland 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.更多还原