摘要
作物系数是计算作物需水量必不可少的参数。对非标准状况下,FAO推荐的作物系数计算方法进行了综述。计算作物系数的非标准状况分四种情况:①水分胁迫（缺水）;②自然植被、稀少植物和非原始植被;③不同管理水平状态;④非生长季节。最后提出,非标准状况下作物系数的确定比较复杂,实际应用时,应首先区别于标准状况的各项因素,然后推求作物系数。
Crop coefficient is a necessary parameter for calculation the crop evapotranspiration ( ET ) . In this paper, the calculation method of ET under abnormal conditions suggested by FAO is presented. The abnormal conditions are as follows:(1) water deficiency; (2) natural plant-covering, rare plant-covering, and non-original plant covering;(3) different management situation; (4) beyond growing season. Authors pointed out that calcu-lation of crop coefficient under the abnormal conditions is quite complicated. For the application, at first the factors under normal conditions should be distinguished, then to calculate the actual crop coefficient.
出处
《中国农村水利水电》
北大核心
2002年第2期32-34,37,共4页
China Rural Water and Hydropower
基金
欧共体合作项目ERBIC18CT970170的部分研究内容。
关键词
作物系数
需水量
土壤
腾发量
abnormal condition normal condition crop coefficient
