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一、引言水不仅为农业生物的生命活动所必需,而且对农业生产的各种重要因素起着调节和促进作用。在干旱地区,往往由于水份缺乏,严重地限制了农业生产的发展,而引水灌溉则常因设计和管理不当,导致土壤的盐碱化和沼泽化。在湿润地区,虽有充沛的雨水,但由于季节性的自然分布不均,常有涝灾和湿害,旱季则有缺水现象,影响农业生产。随着农业科学技
I. INTRODUCTION Water is not only necessary for the life activities of agricultural organisms, but also plays a regulating and promoting role for various important factors of agricultural production. In arid regions, the development of agricultural production is often severely limited due to lack of water, while the diversion irrigation is often caused by improper design and management, resulting in the salinization and swamping of the soil. In humid areas, although there is abundant rainwater, due to the seasonal distribution of natural disasters, floods and dampness often occur. In the dry season, water is scarce and affects agricultural production. With Agricultural Science and Technology