期刊论文

中文

长江流域资源与环境

1004-8227

2001

10

3

243-247

10.3969/j.issn.1004-8227.2001.03.009

中国科学院“九五”重大项目! (KZ -A1- 30 1)； 湖南省自然科学基金! (99JJY2 0 0 19)资助；

本校为其他机构

亚热带丘岗区降水丰沛，全年降水总量大于蒸发量。以试区为例，平均年降水量是蒸发量的1.32倍，每年4～7月下旬降水在时间上的分布较为均匀，降水频数大，8～10月底，则会出现水分亏缺，降水频数少，时间上分布不匀。对于第一季水稻的生产，耕灌雨养（天灌）与传统的灌溉方式在产量形成方面没有多大的差异，最大减产率仅为传统灌溉方式总产量的6.68%，晚稻则会造成大量减产，减产率达20.98%。因此，考虑到在广大的亚热带丘岗区水分调蓄的特殊性，可针对区域内具体的水分条件适时插秧，充分利用天然降水完成第一季水稻的生产，第二季则可种植旱地作物以避开季节性干旱，这样既可以缓解水资源紧缺...

The rainfall in subtropical hilly land is sufficient,and on average is 1.32 times of the annual water evaporation.The rainfall is almost even throughout the period from April to late July,with a relatively high frequence.However,the yield of rice is not significantly affected by the rain irrigation.A maximum of 6.68% reduction of the grain product may be expected.Although the rainfalls from August to October are quite sporadical,the reduction of the grain production due to the rainfalls in this season can be serious,and may reach 20.98%.When considering the unique adjusting ability of the hill...