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吴县地处苏州市郊,临近太湖之滨,是杉木分布的北缘地区。全县共有丘陵面积27万亩,其中宜林山地22万亩。解放以来,特别是七十年代,大量引种杉木达1.7万亩,目前保存面积1.5万亩,其中速生丰产林仅0.5万亩。这主要由于对栽杉种源选择认识不足,加之造林选地不当等原因造成。为了选择适宜的杉木种源造林,提高现有杉木林的生产力,为种源调拨提供可靠的科学依据,我们分别对本县皋峰林场栽种的本省宜兴种源和东渚林场栽种的湖南会同种源的生长情况进行调查研究,现将结果浅析于后。 一、林地概况与调查方法 吴县地理位置为北纬30°51′—31°33′,东经119°55′—120°54′,属北亚热带海洋性气候,年平均温度15.9℃,极端最高气温38.8℃,极端最低气温-8.7℃,年平均相对湿度79％,年降雨量1110.4—1467.2毫米,集中在4—9月,以5月上旬至7月上旬最
Wu County is located in the outskirts of Suzhou, near the coast of Taihu Lake, is the distribution of fir north edge region. The county has a total area of 270000 hectares, of which 220000 acres of mountain forest. Since the liberation, especially in the seventies, a large number of introduction of cedar amounted to 17000 acres, the current preservation area of 15000 acres, of which only 0.5 acres of fast growing forest. This is mainly due to inadequate understanding of the choice of provenance, coupled with inappropriate selection of afforestation and other reasons. In order to select the appropriate afforestation of Chinese fir plantation, improve the productivity of existing Chinese fir plantation and provide a reliable scientific basis for the allocation of provenance, we separately analyzed the provenances of Hunan Huitong provenance planted in Gaofeng Forest Farm of Hunan Province and Hunan Huitongyuan planted in East Houzhu Forest Farm The growth of the investigation, now the results of the analysis. I. General Situation and Investigation Methods of Woodland Wuxian is located in the northern subtropical marine climate with the latitude of 30 ° 51’-31 ° 33’N and longitude 119 ° 55’-120 ° 54’E, with an annual average temperature of 15.9 ° C and an extreme maximum temperature of 38.8 ° C ℃, the extreme minimum temperature of -8.7 ℃, annual average relative humidity of 79%, annual rainfall of 1110.4-1467.2 mm, concentrated in the 4-9 months, in early May to early July most