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我县位于河北省的最南部,年平均气温12.9℃,最低气温-15.3℃,最高气温39℃,年降雨量600多毫米,多集中在七、八、九三个月,属干燥季风性大陆气候。几年来我县搞了农桐间作七万余亩,幼树定植后,翌春普遍出现枯枝、枯干和死亡现象,造成大面积缺株断行和生长不良。为搞清兰考桐幼树枯枝、枯干的原因,对郝王村、落村、杜城营三个大队三千多亩农田内的兰考桐,采取随机抽样的方法,进行了调查,其结果如下:
My county is located in the southernmost part of Hebei Province, the annual average temperature of 12.9 ℃, the lowest temperature of -15.3 ℃, the highest temperature of 39 ℃, annual rainfall of more than 600 mm, mostly concentrated in seven, eight, nine months, is a dry monsoon continent climate. In recent years, our county has engaged in more than 70,000 hectares of Agropyron intercropped with young trees. After planting, the phenomenon of dead branches, withered and dead are common in the next spring, resulting in a large area of missing lines and poor growth. In order to find out the reason why the young tree of Lantus kurosii grows dead and wilted, we conducted a survey on the blue-cedar tree in the farmland of more than 3000 mu in Haowangcun, Lokchon and Ducheng-battalion. The results were obtained by random sampling as follows: