论文部分内容阅读
在黑土地区,土壤腐殖质含量及组成对黑土肥力有着极重要的影响,为此我们于1979—1980年从榆树、德惠、怀德三县为重点,对吉林省中部黑土腐殖质含量和组成及其与肥力的关系,进行了调查研究,现将初步结果整理如下。 一、研究方法 供试黑土分布在吉林省中长铁路两侧黄土台地上,母质为黄土状沉积物,已有二三百年发展历史。根据现有资料统计,黑土面积为200多万公顷,占全省总面积的11％;耕地面积近150万公顷,占全省耕地面积的11％;雨量充足,年降水量500—600毫米,无霜期130—140天,是全省主要商品粮基地。
In the black soil area, the content and composition of soil humus have an extremely important influence on the fertility of black soil. Therefore, from 1979 to 1980, we focused on the content and composition of humus in the black soil of central Jilin Province from the three counties of Yushu, Dehui and Wye. And fertility, conducted a survey, the preliminary results are now organized as follows. First, the research methods for the test of black soil distribution in the Jilin Province on both sides of the loess plateau, the mother of loess sediments, has two or three hundred years of development history. According to the available statistics, the area of black soil is more than 2 million hectares, accounting for 11% of the total area of the province; the cultivated area is nearly 1.5 million hectares, accounting for 11% of the total cultivated area of the province; the rainfall is sufficient and the annual precipitation is 500-600 mm, Frost-free period 130-140 days, is the province’s main commodity grain base.