蒙古高原植被生物量和土壤属性关系定量研究

陆地生态系统中植被与土壤密切相关,研究二者之间的关系具有重要的生态意义。本研究以蒙古高原为研究对象,设置样地并进行采样调查,测定植被生物量及土壤因子数据,定量分析蒙古高原的土壤、植被状况,并基于对应分析方法探究植被生物量与土壤因子的关系,寻找影响植被生物量的关键土壤因子。结果显示：(1)从整体上讲,蒙古高原土壤的有机质含量整体偏丰富,但呈两极分化状态,土壤速效磷、速效钾含量的丰富程度显著,而土壤的全氮含量明显偏低。研究区土壤多为中性、碱性土,碱性土略多于中性土。研究区内的土壤质地多为壤土；(2)蒙古高原的植被生物量分布均匀,且草地植被生物量普遍高于裸地植被生物量；(3)蒙古高原的植被生物量主要受土壤有机质、全氮含量的影响,与这两个因子均为正相关关系。

Relationship Quantitative Analysis of Vegetation Biomass and Edaphic Factors in Mongolian Plateau

Vegetation is related to soil closely in terrestrial ecosystem, the study of the relationship between them has important ecological significance. Mongolian plateau was used as an example, samples were collected, vegetation biomass and soil factor data were measured, soil and vegetation condition were quantitatively analyzed, and the relationship between vegetable biomass and soil factors was studied by the correspondence analysis method to find out the key soil factor that affected vegetation biomass. The results showed that (1) soil organic matter of Mongolian plateau was high in total with a polarized distribution, the content of available phosphorus and potassium was high while the total nitrogen content was low, the soil was mainly neutral and alkaline, and the area of alkaline soil was slightly bigger than that of neutral soil, the soil texture was mainly loam; (2) the vegetation biomass distributed in balance, and the vegetation biomass of grassland was higher than that of bare land; (3) the vegetation biomass was mainly affected by soil organic matter and total nitrogen content, vegetation biomass showed a positive correlation with them.