高水肥地覆膜玉米温度效应研究

A Study of Effects of Plastic Film on Soil Temperature in High Irrigated and Fertile Maize Fields

本文研究了在高水肥条件下覆膜、揭膜、露地玉米对土壤温度的影响。覆膜后苗期增温显著，拔节后增幅渐低，大喇叭期覆膜地温反而略有降低，这是土壤热交换随生育时期推移以及覆膜玉米发育加快的影响而发生变化所致。高水肥地覆膜玉米大幅度增产途径是更换品种、提早播种和适时揭膜。

Under plastic film covering,film removing and control treatments,soil temperatures were studied of maize grown in high irrigated and fertile fields.Film covering increased soil temperatures significantly in seedling stage.Temperature increase went down with stem elongation and were inversed when maize population approached ceiling leaf area index.This resulted indirectly from variations in crop stages and faster growth process in film-covered fields.To get higher grain yields using plastic film covering inirrigated and fertile maize,sowing date should be earlier,varieties used with longer life cycle,and film removed as soon as no temperature increase remains.