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成都平原600余万亩农田的灌溉水源,主要是岷山积雪融化而来。由岷江发源点到始灌区流程仅约两三百里,河床比降大,流速快,两岸尽是高山森林掩蔽,水在深沟狭谷里流行,接受日照时间短,因此在早、中稻的生长期间,灌溉水温低。1956年在灌区下游的都附近测定:1—6月的日平均水温,灌溉沟比稻田低0.3—2.0度(摄氏),又据1958年在灌区中游的调查:在郫县红光社,灌溉沟日平均水温比稻田水温低很多,三月份低4.1度,4月份低1.9度,五月份低1.6度。在郫县(?)浦乡测定早稻生长期间,灌溉沟
Chengdu Plain more than 600 acres of farmland irrigation water, mainly Minshan snow melts. From the source of the Minjiang River to the initial irrigation area, the flow rate is only about two to three hundred years. The riverbed is larger than that of the riverbed, and the flow velocity is fast. Both sides of the river are covered by alpine forests. The water is popular in the deep- During the growing season, irrigation water temperature is low. In 1956 in the vicinity of the lower reaches of the irrigation area are measured: the average daily temperature of 1-6 months, the irrigation ditch than rice paddy low 0.3-2.0 degrees (Celsius), and according to 1958 survey in the middle reaches of the irrigation area: The average daily water temperature in the ditches is much lower than the water temperature in the paddy fields. It was 4.1 degrees lower in March, 1.9 degrees lower in April and 1.6 degrees lower in May. In Pixian (?) Puxiang measured early rice growth period, irrigation ditch