摘要
根据水量平衡方程式计算，雨养麦田５个试验麦季的耗水量分别为４３５．５、３２６．０、２９３．８、２７７．２和３６５．９ｍｍ，可代表该区过湿、一般和干旱年份的小麦耗水量．研究结果表明，小麦地上部分生物量与其总耗水量的相关关系不显著（ｒ＝０．６７）．在耗水量中，土壤储水的贡献占５０％．在降雨少而土壤储水丰足的年份，其贡献高达６０％，是小麦水分的重要来源．在充分施肥条件下，５个麦季的水分利用率≥１１．２５ｋｇ·ｈａ－１·ｍｍ－１，表明适当增加肥料投入可提高农田水分利用率．
Calculations on water balance show that the amount of water consumption in a rainedwheat field is respectively 435. 5, 326. 0, 293. 8,277. 2 and 365. gmm in five experimentalseasons, which can represent the water consumption of wheat in Fengqiu region under theexcessive, moderate and defective hydrological conditions. The correlation between wheatbiomass (grain + straw) and total water consumption is not significant (r= 0. 67 ).About 50% of the water consumed comes from the water stored in soil before sowing. Inyears less in rainfall during growing season but abundant in water stored in soil, this percentage would be up to 60%, showing that soil water is an important water source forwheat growth. Under optimum fertilization, the water use efficiency is more than 11. 25kg· ha-1· mm-1, which indicates that the increase of fertilizer supply can increase the water use efficiency of farmland.
出处
《应用生态学报》
CAS
CSCD
1995年第S1期57-61,共5页
Chinese Journal of Applied Ecology
基金
中国科学院重点资助
关键词
封丘地区
耗水量
水分利用
Fengqiu region, Water consumption, Water use efficiency.
