川西盆周丘陵地区油菜作物生态效应的初步探讨

Agroecological Effects of Rape Crops in Mountainous Areas of Western Sichuan Basin

名山县位于东经103°08′,北纬30°06′,是四川省商品粮油基地县之一,属川西盆周丘陵地区。年平均气温15.5℃,日照1052.0小时,降雨量1519.9mm,一年两熟,能满足油菜全生育期的需要。全县油菜发展较快,1989年较1983年种植面积扩大了33.91%,达到6000ha;总产增加30.35%,达到5958.1t。

Based on climatic and agricultural data and with Kassam's method of agroecological divisioning, the potential productivity of rape crops at different ecological zones in mountainous regions of western Sichuan Basin are calculated. Integrated regression equations of light, temperature, water and rape yield are computerized, and affected coefficients of ecological factors on rape yield are calculated. It shows that the potential productivity of rape crops in these regions is 2.7-4.0 times higher than practical yield, and the affected coefficients of temperature and precipitation are significant. Low temperature and cloudy and rainy weather in early spring are also important limiting factors to rape yield. Measures for popularizing intermediate and late mature fine breeds of rape crops are put forward and have been verified by practical truth.