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黄土丘陵沟壑区两种立地条件下农田水量平衡及作物反应的比较研究
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摘要
本文通过野外试验对比研究了黄土丘陵沟壑区山地梯田与川地两种立地条件下玉米、谷子的农田水量平衡过程及其作物反应,结论如下:
     1.立地条件对水面蒸发影响明显,4月-10月川地和梯田的水面蒸发量分别为700.3mm和823.0mm,两地均以7月份的水面蒸发量为年内最大,而4-10月间川地和梯田的水面蒸发量分别以10月和9月为最小;
     2.作物对立地条件的反应表现不同:川地谷子的LAI在作物生育前期大于梯田谷子,后期则相反,而其株高则在整个生育期中大于梯田谷子;川地谷子的千粒重、地上部生物量高于梯田,而梯田谷子的WUE高于川地,但两种立地条件下三者之间差异不显著;川地玉米的LAI和株高在整个生育期内大于梯田玉米,其籽粒产量、地上部生物量和WUE分别为梯田玉米的1.34、1.54和1.17倍;
     3.立地差异对作物的耗水影响较大:川地和梯田谷子生育期总耗水量分别为544.1mm和468.4mm,其与同期水面蒸发量的比值(ET/E_0)分别为0.97和0.69;川地和梯田玉米生育期耗水量分别为564.9mm和491.7mm,其ET/E_0分别为0.99为0.77;
     4.试验年份,川地灌溉与非灌溉地作物的千粒重、籽粒产量和地上部干物质重没有显著差异,谷子、玉米的耗水特性系数分别为1.10和1.05;
     5.4—10月间,川地和梯田休闲地土壤贮水量的变化可大致分为两个时期:7月之前的恢复上升期和7月之后的缓慢失水期。与4月份相比,10月份川地休闲地2m土体的贮水量减少了10.9mm,而梯田休闲地增加了66.8mm;梯田休闲地各层土壤含水量的变化均比川地休闲地强烈,其变异系数在8.7—21.4%之间,川地休闲地的变异系数在9.3—16.7%之间。
This paper mainly addressed the issue of maize and millet fields' water balance and corps' response between plain and terrace in the hill-gully region of Loess Plateau. The experiments were conducted at the An'sai Soil and Water Conservation Research Station, Chinese Academy of Science, in 2002. The main results showed:
    1. There was obvious difference between plain and terrace's water surface evaporation (E0). From April to October the total EO was 700.3 mm in the plain and 823.0 mm at the terrace. Both in the plain and at the terrace the E0 of July was the biggest in the whole year. But the month of the lowest EO was different between plain and terrace. October and September was the lowest month in the crops growing season in the plain and at the terrace respectively.
    2. The crops' response to the land condition were different. Terrace millet's LAI was smaller than that of plain millet at the beginning stage, but it was reverse in the later. In the whole growing period, plain millet's height was higher than terrace millet's. There was no evident difference in millet's yield and kernel weight between plain and terrace. But the plain millet's WUE was a little higher than that of terrace millet. The terrace maize's height and LAI were clearly got behind of plain maize in the whole growing period. The plain maize's yield, aerial biomass and WUE were 1.34, 1.54 and 1.17 times than those of terrace maize.
    3. The crops' water consumption was quite different between plain and terrace. The total water consumption of millet was 544.1mm in the plain and 461.8mm at the terrace. As to maize, it was 564.9mm in the plain and 491.7mm at the terrace. In the whole growing period, the ET/E0 (Evapotranspiration/water surface evaporation) of millet was 0.97 in the plain and 0.69 at the terrace, which was 0.99 of plain maize and 0.77 of terrace maize.
    4. There was no evident difference in crops' yield, kernel weight and aerial biomass between sufficient water supplying condition and rainfed condition in the experiment year. Millet and maize's crop coefficient (Kc) value were 1.10 and 1.05.
    5. The soil moisture's dynamic variation of bare lands during crop's growing period could be separate to two stages. April to July is the soil water's accumulation period, and August to October is whose decreasing period. The result showed that in October the soil storage water of plain's bare land was decreased 10.9mm if compared with that of April, but to terrace whrch was increased 66.8mm. Compared with plain, every layer's soil moisture of terrace fluctuated more violently. The cv (coefficient of variation) of soil moisture's variation was 9.3%-6.7% in the plain and 8.7%-21.4% at the terrace.
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