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我场位于宁镇山脉的东端,属北亚热带地区.土壤属黄棕壤和黄褐色土类,但随着地形、地势、成土的母质不同而不同,一般以矽质石灰岩、石英岩、砂岩等母质发育成黄棕壤,在山脚丘陵下蜀系黄土母质发育成黄褐色土类,并主要分布在仑山以南丘陵地带.黄褐色土类,表土以黄褐色为主,微带棕色,表层为中壤或粘土,心土均为粘土,土体很坚实,透水性较差,土壤结构为核粒状、棱柱状、块状等,结构之间附有褐棕色的胶膜,pH值5—6之间,呈酸性反应,土层深厚,有机质含量少,肥力很差.这种土壤类型,在苏南丘陵分布较广,一般栽植杉木不易成林,易形成“小老树”.对这部分山地的利用,在营林上是一个重要的问题.为此,我场于1974年开始引种湿地松,取得了较好效果.
My field is located in the eastern end of the Ningzhen Mountains, belonging to the northern subtropical region. Soil is yellow brown soil and brown soil, but with the topography, terrain, different from the parent material into the soil, generally in silicic limestone, quartzite, Sandstone and other parent material developed into yellow-brown soil, in the foot of the hill under the Department of loess parent material developed into brown soil, and mainly distributed in the hilly area south of Lun Shan .Thalan soil, topsoil mainly brown, microstrip brown , The surface of the soil or clay, heart and clay are clay, soil is very solid, poor water permeability, soil structure of the nucleus granular, prismatic, massive, brown brown adhesive film between the structure, pH 5-6, acidic reaction, deep soil, organic matter content is low, fertility is poor.This soil type, widely distributed in southern Jiangsu hills, the general planted fir is not easy to become a forest, easy to form a “small old tree.” The use of this part of the mountain is an important issue in the forest, and for this reason, I began to introduce the pine in 1974 and achieved good results.