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苏北平原从60年代引种杉木,现已初见成效。阜宁县灌溉总渠河堤土壤PH值8—8.5,可溶性盐含量为0.02—0.04％的地段,11年生杉木,平均树高10.6米,最高11.4米,平均胸径17.2厘米,最粗19.7厘米。5年生杉木,平均树高5.4米,最高6.9米;平均胸径7.2厘米,最粗8.6厘米。 我所于1974年开始在阜宁县河堤及黄河故道进行平原栽杉试验,在引种栽杉的过程中,对杉苗生长进行了观测分析,现将结果整理如下: 一、研究方法 试验地设在南京本所苗圃,并在立地条件和育苗措施一致的苗床上设观测取样小区。每月定期随机抽样选取样苗100株,区分根、茎、叶立即于分度值为0.01克的天平上测定鲜重,再于105℃的烘箱内烘干至恒重后测定烘干重。同时,每旬对苗
The northern Jiangsu plain from the 60’s introduction of Chinese fir, has achieved initial success. Funing County irrigation canal embankment soil PH value of 8-8.5, soluble salt content of 0.02-0.04% of the lots, 11-year-old fir, the average tree height of 10.6 meters, the highest 11.4 meters, the average diameter of 17.2 cm, the thickest 19.7 cm. 5-year-old fir, the average height of 5.4 meters, the highest 6.9 meters; the average diameter of 7.2 cm, the most 8.6 cm. I began in 1974 in Funing County embankment and the Yellow River old planted plain test, in the process of introduction of fir, the fir seedling growth were observed and analyzed, the results are summarized as follows: First, the method of research Nursery nurseries in Nanjing, and site conditions and nursery measures in the same set of observation beds on the sampling area. A total of 100 samples of seedlings were randomly selected every month. Roots, stems and leaves were immediately sampled at a balance of 0.01 g, and then dried at 105 ° C in an oven until constant weight was measured. At the same time, every ten days on the seedlings