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根据北京永乐店试验站的田间试验资料,得出冬小麦生长与土壤-植物-大气连续体(简称SPAC)水热运移耦合的WheatSPAC模型计算需要的土壤参数与冬小麦遗传参数。将模型的计算值与实测值进行比较,表明模型能够较好地模拟叶面积指数、干物质重、土壤水分温度等。利用WheatSPAC模型对不同灌溉条件下的田间水热状况与作物产量进行分析,得到结论:对于北京地区的气候条件,返青后作物蒸腾消耗占净辐射的5 0 %以上;如果返青后墒情较好,在拔节期进行灌溉对冬小麦的最终产量最为有利;如果在拔节之后进行一次灌溉,则灌溉进行得越早对产量越有利;三水以后,随灌溉量的增加,产量的边际效益递减;返青后,降雨与灌溉的总量约2 4 0mm对冬小麦的生长比较适宜
According to the field experiment data of Beijing Yongledian Experimental Station, WheatSPAC model for calculating the winter wheat growth coupled with the hydrothermal coupling of soil-plant-atmosphere continuum (SPAC) was derived to calculate the required soil parameters and winter wheat genetic parameters. Comparing the calculated value of the model with the measured value, the model can better simulate the leaf area index, dry matter weight, soil moisture temperature and so on. WheatSPAC model was used to analyze field water and heat conditions and crop yield under different irrigation conditions. It was concluded that for the climate conditions in Beijing, crop transpiration consumes more than 50% of the net radiation after returning to green; if soil moisture is good after returning to green, Irrigation at jointing stage is most beneficial to the final yield of winter wheat. If irrigation is conducted after jointing, the earlier the irrigation, the more favorable the yield. The lower the marginal benefit of yield with the increase of irrigation after Sanshui, , The total rainfall of about 240mm and winter wheat growth more appropriate