生态学报2018，Vol.38Issue(2)：560-570,11.DOI:10.5846/stxb201701100079
河北省典型区主要作物有效降雨量和需水量特征
Effective precipitation and water requirements of crops in Hebei Province over 60 years
摘要
Abstract
Effective precipitation and water requirements throughout a growing period are important for planning irrigation and optimal water resource allocation.In this study,Jize County of Hebei Province was selected as a typical region to calculate the winter wheat,summer maize,and cotton effective precipitation and water requirements,using the PenmanMonteith equation recommended bv FAO and the piecewise single value average crop coefficient method.Using the MannKendall test method,we analyzed the trends of changes in effective precipitation and crop water requirements over the 1955-2015 in Jize County.The water requirement of the main crops showed a significant decreasing trend,and the average water requirement of the crops in was in the order of cotton,winter wheat,and summer maize.The maximum water requirement of winter wheat was 593.2 mm in 1968,the maximum water requirement of summer maize was 581.6 mm in 1968,and the maximum water requirement of cotton was 710.4 mm in 1972.An obvious change in water requirements,which was directly related to the improvement of crop varieties,appeared in the 1980s.The different water requirements of crops are related to the physiological characteristics of the crops.The maximum water requirements of winter wheat,summer corn,and cotton were during different growth stages;these were the middle growth stage,initial growth stage,and rapid development stage,respectively.Effective precipitation showed no significant decreasing trend in any of the three crops.The daily precipitation required for crop growth gradually declined over time,and the average effective precipitation of the crops in was in the ascending order of cotton,summer maize,and winter wheat.The maximum effective precipitation of winter wheat was 170.4 mm in 1963,the maximum effective precipitation of summer maize was 320.5 mm in 1961,and the maximum effective precipitation of cotton was 422.7 mm in 1973.Because the winter wheat growth period is concentrated in the winter and precipitation is low in this season,the effective rainfall is far lower than that for the summer maize and cotton.All three crops experienced their maximum effective rainfall mid-season.Water deficits showed a decreasing trend for all three crops,and the average effective precipitation of the crops in was in the order of winter wheat,summer maize,and cotton.There was a change in water deficits over the 60-year period included in this study The moisture loss index of winter wheat fluctuated in the range of-100 to-60 and the moisture loss index of summer maize and cotton fluctuated in the range of-80 to-20.Although the maximum water requirement and effective rainfall appeared at the same growth stage in winter wheat,the moisture loss index is relatively low during that stage,leading to a higher level of drought,so the winter wheat water shortage situation is more serious.It should be noted that the water requirement of the three crops is similar to that of water demand.关键词
有效降雨量/需水量/缺水量/水分盈亏指数/鸡泽县Key words
effective precipitation/water requirement/water deficit/moisture loss index/Jize County引用本文复制引用
曹永强,朱明明,李维佳..河北省典型区主要作物有效降雨量和需水量特征[J].生态学报,2018,38(2):560-570,11.基金项目
国家自然科学基金项目(51579126,51779114) （51579126,51779114）
中国气象局干旱气候变化与减灾重点实验室开放基金项目(IAM201511) （IAM201511）
中国科学院农业水资源重点实验室2016年对外开放基金项目(KFKT201602) （KFKT201602）
