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宿迁县地处苏北黄淮平原。年平均气温14.1℃,最低气温-23.4℃;年降雨量939毫米,大都集中在7、8、9三个月,无霜期290天,土壤属黄淮河冲积形成的花斑盐土,含盐量0.1--0.3％,pH值7.0--8.5,局部9.0。于80年代初引种池杉,从1982年开始大面积营造速生丰产林,至1986年底,全县池杉速生丰产林面积已达7000余亩,零星栽植10万余株。但很多地方的池杉林先后出现了黄化现象,严重地影响了林木的生长。近几年来,我们采取了以下综合措施,对防治池杉在碱性土上的黄化,取得了较好的效果。
Suqian County is located in northern Jiangsu Huang-Huai Plain. Annual average temperature of 14.1 ℃, minimum temperature of -23.4 ℃; annual rainfall of 939 mm, mostly concentrated in 7,8,9 three months, frost-free period of 290 days, the soil is the Huanghuaihe alluvial the formation of flower-colored salt, salt content of 0.1- -0.3%, pH 7.0-8.5, partial 9.0. Introduced in the early 80s Iyongsana, from 1982 to create a large area of fast-growing high-yield forest, by the end of 1986, the county fast-growing high yield forest area has reached more than 7,000 acres, scattered planting more than 100,000 strains. However, in many places, Ipomoea linarius appears yellowing which has seriously affected the growth of trees. In recent years, we have taken the following comprehensive measures to prevent and cure Ipomoea on the alkaline soil yellowing, and achieved good results.