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选择适宜的树种种源造林,是林业生产的重要技术措施之一。我场以往杉木造林多采用浙、皖邻省种源,林木生产力不高。自1972年以后,开始引种杉木中心产区会同种源,共造林35亩。为探讨该种源在本县低山丘陵地区的生产潜力,1985年底进行了全面调查,现将结果报道如下: 一、引种地概况 我场位于句容县最南端,地处北亚热带季风气候区,年平均温度15.2℃,年最高温度39.6℃,年极端最低温度-16.7℃,平均
Choosing suitable tree species for afforestation is one of the important technical measures in forestry production. In the past, most of the reforestation sites in China adopted the provenance of Zhejiang and Anhui provinces, and their tree productivity was not high. Since 1972, the introduction of fir seed production center will be the same source, altogether 35 acres of afforestation. In order to investigate the potential of this provenance in the hilly region of this county, a comprehensive investigation was carried out by the end of 1985, and the results are reported as follows: I. INTRODUCTION INTRODUCTION My Farm is located in the southernmost tip of Jurong County, located in the northern subtropical monsoon climate zone, The annual average temperature is 15.2 ℃, the annual maximum temperature is 39.6 ℃, the annual extreme minimum temperature is -16.7 ℃, the average