The experiment shows that poplar's frost crack could prevent by the measures such as white paint, wrapping grass, tending one time and reserving grass around tree trunk.
试验证明：对杨树进行涂白、包草和抚育一遍、树干周围留草可以预防杨树冻裂。
K + W value is specified for selecting tree species in forestation and tending thinning.
(K + w)值对选择造林树种和抚育间伐具有一定的指导意义。
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