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根据呼伦贝尔草原大范围草地生物量的调查和实验数据,分析了该地区草地生物量的动态变化规律及其与环境因子的关系。结果表明,沿着环境梯度,不同区域草地生物量差异显著,其变化与水分、温度变化关系不显著,与0～20cm土层的土壤有机碳含量呈正相关,而与土壤容重呈负相关。逐步多元回归表明,土壤有机碳是制约生物量变化的主要因素,可能是当地草地利用方式使土壤养分成为制约草地植物生长的限制因子,从而影响草地生物量。
According to the survey and experimental data of grassland biomass in a large area of Hulunbeier grassland, the dynamic change law of grassland biomass and its relationship with environmental factors were analyzed. The results showed that there was significant difference in grassland biomass between different regions along the environmental gradient. The change of the grassland biomass was not significantly correlated with the changes of water and temperature, but positively correlated with soil organic carbon content in 0 ~ 20cm soil layer, but negatively correlated with soil bulk density. The stepwise multiple regression shows that soil organic carbon is the main factor that restricts the biomass change. It may be that the local grassland utilization mode makes the soil nutrient as the limiting factor that restricts the growth of grassland plants, thus affecting the grassland biomass.