红壤丘岗缓坡地水资源状况与管理

STATUS AND MANAGEMENT OF WATER RESOURCES IN RED SOIL REGIONS AND HILLY_SLOPPY LANDS

红壤丘岗缓坡地是我国重要的后备耕地资源。就整个区域而言 ,降雨总量能基本满足坡地农业开发的需求。然而 ,由于红壤区降雨的时空分配不均 ,土壤结构性差、保水能力弱 ,季节性干旱缺水将阻碍坡地农业的开发利用。以蓄水引水工程建设为基础 ,生态节水技术与科学的农艺栽培措施相结合 ,改善土壤结构 ,增强土壤持蓄水能力 ,实施农林草复合经营 ,提高坡地径流水的积蓄循环再利用率 ,是降低红壤丘岗区季节性干旱危害 。

Hilly_sloppy is an important potential resource of farming land in subtropical red soil regions in China.But for the dramatical changes and spatial unbalances of rainfall in these regions,the agricultural exploitation of this land is usually obstructed,although the total amount of precipitation should basically meet with the farming requirements.Still other disadvantages for the exploitation of the hilly_sloppy land are conditions of soil structure,xwater capacity,and seasonal drought.It suggested in this paper that it should be the important prerequisite to construct the irrigation works,for the purpose of decreasing the damage of seasonal drought and promoting the sustainable development of the slopy land agriculture.The other methods are also mentioned,such as the combination of ecological and water_saving irrigation technology with suitable agronomic measures,the complex management of cropping_forestry_herbage,and the improvement of soil structure,the way to increase soil water capacity and the amount of runoff water storage and its recycling use ratio.