论文部分内容阅读
不同土壤水分状况对夏玉米生长发育和产量形成有着明显的影响,并且通过各种生理生态特征表现出来。本文根据1984—1987年试验资料,系统分析了土壤水分对气孔阻力、光合作用、蒸腾强度、灌浆速度等生理特征和产量的影响,建立了土壤湿度与它们之间的数学模式,运用最优分割理论进行最优分割,确定了夏玉米拨节—抽雄期的适宜土壤水分指标为15.5％,干旱指标为10.5％;分别占田间持水量的71.4％和48.4％,抽雄—成熟期的适宜水分指标为16.7％,干旱指标为10.7％,分别占田间持水量的77.0％和49.3％。从而为灌溉管理提供了依据。
Different soil water conditions have a significant impact on the growth and yield formation of summer maize and are manifested through various physiological and ecological characteristics. Based on the experimental data from 1984 to 1987, this paper systematically analyzed the effects of soil moisture on physiological characteristics and yield of stomatal resistance, photosynthesis, transpiration intensity and grain filling rate. The mathematical model of soil moisture and their relationships was established. By using the optimal segmentation The optimal partitioning theory was used to determine the suitable soil moisture index and the drought index of summer maize in dialling-tasseling stage were 15.5% and 71.4% and 48.4% respectively, and the suitable moisture index in tasseling and maturing stage 16.7% and the drought index was 10.7%, accounting for 77.0% and 49.3% of the field water capacity respectively. So as to provide the basis for irrigation management.