改进后的CTM模型在半干旱区作物生长中的应用

将改进后含有温度和水肥补偿效应的CTM模型应用于半干旱区作物研究中,分析了水分因子与土壤养分因子间的生态学补偿效应,模拟了半干旱区作物生长过程,并对在不同水分和不同施肥量下的作物生长状况进行了数值模拟.结果表明,在水分变化梯度上,随着土壤水分的增加,主要作物春小麦的产量呈上升趋势,试验条件下春小麦籽粒产量的最大值为462.35g@m-2;一定限度内通过合理施肥可以补偿土壤水分不足.模拟计算结果表明,丰水条件下施中肥效果最好.

Application of Improved CTM Approach to Crop Growth in Semi-arid Area

The numerical simulation of crop growth status under different moistures and rat e of fertilizer application have been completed. The results show that the yield of spring wheat has the rising tendency with soil moisture rising in the gradie nts of moisture movement. The maximum yield of spring wheat is 462\^35 g\5m - 2 under experimental conditions. The deficiency of soil moisture in farmland m ay be compensated in definite limitation by adequate fertility. The compensating mechanism is that the increasing of soil nutrient make it possible to enlarge r oots and thus enhance the ability of root imbibing water. Moreover, the results of simulating calculation indicate that it has the best effect under the conditi on of water abundance by medium fertilizer applying. It offers a quantitative gr ound for controlling the moisture and the amounts of fertility in semi-arid far m fields.