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Water Budget Analysis of Red Soils in Central Jiangxi Province,China

机译：江西中部地区红壤水收支分析

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摘要

The daily soil water budgets in the red soil areas of central Jiangxi Province,southern China,were investigated with a large-scale weighing lysimeter and runoff plots. From 1998 to 2000,peanuts (Arachis hypogaea L.) and rape (Brassica napus L.) were planted in the lysimeter and in 1999,peanuts were planted in the runoff plots. The soil water budget components including rainfall,runoff,percolation and evapotranspiration were measured directly or calculated by Richards' equation and water balance equation. The results showed that most rainfall,including rainstorms,occurred from March to July,and induced the greatest soil water percolation during the year. The evapotranspiration was still large from July to September when rainfall was minimal. Thus,the lack of synchronization in soil water inputs and losses was disadvantageous to crops growing in this region. Among the soil water losses,percolation was the largest,followed by evapotranspiration,and then soil runoff. Runoff was very small on farmland with crops. It was significantly different from the uncultivated uplands where large-scale runoff was usually reported. The soil water storage fluctuated sinusoidally,with a large amplitude in the rainy season and a small amplitude in the dry season.
机译：利用大规模的称重渗力计和径流图对江南省中部红壤地区的每日土壤水预算进行了调查。从1998年到2000年，在溶渗仪中种植了花生（花生）和油菜（Brassica napus L。），1999年在径流地种植了花生。直接测量土壤水分收支的组成部分，包括降雨，径流，渗流和蒸散量，或通过理查兹方程和水平衡方程计算。结果表明，大部分降雨（包括暴雨）发生在3月至7月，并且是一年中土壤水渗流最大的时期。从七月到九月，当降雨量很少时，蒸散量仍然很大。因此，土壤水分输入和损失缺乏同步性不利于该地区的农作物生长。在土壤水分流失中，渗流最大，其次是蒸散，然后是径流。在有农作物的农田上，径流很小。它与通常报道大规模径流的未开垦的高地明显不同。土壤贮水量呈正弦波动，雨季幅度较大，旱季幅度较小。

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