黔中地区旱地黄壤抗干旱能力研究

对地处贵州中部的旱地黄壤水分特征曲线测定的基础上,通过2年的定位观测,旱地黄壤无效水分含量高、有效水分贮量少,作物利用难度大,抗干旱能力低,黄壤季节性干旱主要受制于降水;土壤水分耗竭随季节性气候特点和作物种类而异,旱地灌溉应结合季节性气候特点和作物种类等因素进行综合考虑,因地制宜地发展集雨工程,确定灌溉合理的灌水量是解决黄壤旱地季节性干旱的主要措施。

Study on Resistance of Upland Yellow Soil to Drought under Irrigation Condition in Central Guizhou

On the basis of the test for soil water characteristic curve of upland yellow soil and the moisture constant have been determined in central Guizhou province. The speed and rule for soil moisture loss under different cropping systems and irrigation rates have been recognized by means of a 2-year location trial. The availability of water utilization for crops is limited. The resistance of upland yellow soil to drought and the seasonal drought is enslaved to precipitation. The moisture loss differentiates with the seasonal climate and crop types which should be brought into the consideration as major factors of irrigation. The development of rainfall collection works with the natural and economic circumstance and a systematic irrigation measure including a reasonable irrigation rate are the outlet for seasonal drought in upland yellow soil.