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为了增加苏北沿海盐渍土地区造林树种,作者于1981年从泗阳县林苗圃引进白×春榆树进行试种.由于当时种源不足,就进行了白×春榆杂种一代枝条嫁接本地白榆的试验,以便扩大繁殖系数,提高榆树生长速度和木材质量.现将近二年来试验情况报道如下:一、试验地概况试验地设在江苏省防风林试验站.该地为淮北里下河冲积平原,地势低洼,潜水面1.5—2.0米之间,质地为中壤盐渍土,pH8.45—8.6,年平均温度13.7℃,年平均最高气温35.8℃,年平均最低气温-10.4℃,相对湿度74—85%,无霜期224天,年平均降水量1034.8毫米,年蒸发量
In order to increase afforestation tree species in the saline soil area along the coast of northern Jiangsu, the author introduced the white × spring elm trees from the forest nursery of Siyang County in 1981. Because of the lack of provenance at that time, the native white Ulmus test in order to expand the breeding coefficient and improve the speed of elm growth and wood quality test now reported the past two years are as follows: First, the test site profile Experimental site located in windbreak in Jiangsu Province Experimental Station.The site is the alluvial plain , Low lying, submerged 1.5-2.0 meters between the texture of the soil salinization soil, pH8.45-8.6, the annual average temperature of 13.7 ℃, the annual average maximum temperature of 35.8 ℃, the average annual minimum temperature of -10.4 ℃, relative humidity 74-85%, frost-free period of 224 days, the average annual rainfall of 1034.8 mm, the annual evaporation