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本研究以祁连山典型退化高寒沼泽湿地为研究对象,运用重铬酸钾容量法对土壤有机质含量进行测定,同时对植物多样性进行分析。结果表明未退化的有草土层有机质含量较高,在0-10cm土层中达到21.78±2.70,且有机质含量随取样深度的增加表现出显著性降低(P<0.05)。对比退化秃斑样本,有草0-10cm土壤有机质含量极显著(P<0.01)的高于秃斑0-10cm及10-20cm。同时发现,研究区植物种类较丰富,主要以嵩草、苔草为主,主要种包括矮嵩草(Kobresia humilis)、小钩苔草(Carex microglochin)、华扁穗草(Blysmus sinocompressus)、大花嵩草(Kobresia macrantha)、藏嵩草(Kobresia tibetica)、甘肃苔草(Carex kansuensis)、草地早熟禾(Poa pratensis)等。说明该区域有丰富的植物多样性,且湿地退化的原因并不是由于有机质的缺失造成的。
In this study, a typical degraded alpine swamp wetland in Qilian Mountains was selected as the research object. The content of organic matter in soil was determined by potassium dichromate capacity method, and plant diversity was analyzed. The results showed that the content of organic matter in grassland soil was higher than that in grassland soil, reaching 21.78 ± 2.70 in 0-10cm soil layer, and the organic matter content decreased significantly with the increase of sampling depth (P <0.05). Compared with bald patches, there was a significant (P <0.01) higher content of organic matter in 0-10cm soil than that in bald patches 0-10cm and 10-20cm. At the same time, it was found that the plant species in the study area is rich, mainly Kobresia and Carex, and the main species are Kobresia humilis, Carex microglochin, Blysmus sinocompressus, Kobresia macrantha, Kobresia tibetica, Carex kansuensis, Poa pratensis and the like. This shows that the region is rich in plant diversity, and the reason for the degradation of wetlands is not due to the lack of organic matter.