论文部分内容阅读
吉林省东部半山区,原始植被多为针阔混交林,年降水量700～900cm,≥10℃的有效积温2750℃,日照时数偏少。土壤有机质含量一般在1.5%～4.0%,耕地多以丘陵坡地为主,其坡度多在10°～15°,海拔高度多在400～700m,占总耕地面积70%。耕地土壤多
In the eastern part of Jilin Province, most of the original vegetation is coniferous and broad-leaved mixed forest. The annual precipitation is 700-900 cm. The effective accumulated temperature of ≥10 ℃ is 2750 ℃ and the sunshine duration is less than normal. Soil organic matter content is generally 1.5% ~ 4.0%. Most cultivated land is mostly hilly slopes with slope of 10 ° ~ 15 ° and altitude of 400 ~ 700 m, accounting for 70% of the total cultivated land. Cultivated soil and more