论文部分内容阅读
海伦市位于小兴安岭山麓向山前高平原过度地带，地势东北高西南低，太阳辐射总量为111．32千卡／平方厘米，常年活动积温2100～2450℃，平均年降水量500～600毫米，其中5～9月为500毫米。土壤以黑土为主，其次是草甸土。有机质平均含量5％以上，土壤潜在肥力高，速效养分含量较
Helen City is located in the foothills of the Little Hinggan Mountains to the Piedmont high plains over the area, the terrain northeast high southwest low, the total solar radiation 111.32 kcal / cm, perennial activities accumulated temperature 2100 ~ 2450 ℃, the average annual rainfall 500 ~ 600 mm, of which 5 to September is 500 mm. The soil is dominated by black soil, followed by meadow soil. The average content of organic matter more than 5%, potential soil fertility, available nutrient content