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选取可以代表从渭北旱塬至陕北北部顺次过渡的 6个站点 ,采用线性回归方程拟合了代表站点的地温与气温之间的关系 ,以此为依据 ,推算出地膜覆盖增加的地温相当于气温拟增加量 ;采用覆膜后 ,各站点累计负积温拟减少 1 2 2～2 1 0℃ d ,极端最低温度平均拟升高 1 8℃计 ,最后再根据小麦安全越冬所能忍受的最大负积温为 4 0 0℃ d及极端最低温度为 -1 8℃ ,区划出地膜覆盖后小麦适宜种植北界。
Six representative sites that can represent the successive transition from Weibei highland to northern Northern Shaanxi were selected, and the relationship between ground temperature and air temperature on representative sites was fitted by linear regression equation. Based on this, the ground temperature Equivalent to the amount of air temperature to be increased; after the filming, the accumulated negative temperature at each site is to be reduced by 122 to 210 ℃ d, the average minimum temperature is to be increased by 180 ℃, and finally the winter wheat can tolerate overwintering The maximum negative accumulated temperature is 400 ℃ d and the extreme minimum temperature is -1 8 ℃, and it is suitable to planted the northern boundary of wheat after covering the mulching.