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湿地生态系统土壤碳储量在全球碳平衡中起着重要作用。以敦煌阳关国家级自然保护区渥洼池草本沼泽湿地为研究对象,选取53个样地,采用分层采样方法(0~20、20~40和40~60 cm)对其中高盖度、中盖度、低盖度3种植被类型的土壤有机碳含量、分布特征及其影响因素进行了研究。结果表明:(1)高盖度、中盖度、低盖度植被0~60 cm土壤的有机碳含量分别为4.94~25.89、4.77~13.89和3.56~11.42 g·kg~(-1),高盖度、中盖度植被20~40、40~60 cm的土壤有机碳含量与低盖度的差异显著(P<0.05);高盖度植被土壤有机碳的空间变异最大,低盖度植被居中,中盖度植被最小;(2)土壤有机碳含量与土壤水分、全氮、全磷和N/P均呈显著正相关(P<0.01),与土壤盐分、容重均呈显著负相关(P<0.01)。通过多元线性回归分析,土壤水分是影响土壤有机碳积累的关键主导因素。上述研究结果可为干旱区湿地保护、管理以及生态恢复措施的制定提供科学依据。
Wetland ecosystems Soil carbon stocks play an important role in the global carbon balance. Taking the Waukei herbaceous swamp wetland in Dunhuang Yangguang National Nature Reserve as the research object, 53 sample plots were selected and stratified sampling methods (0-20, 20-40 and 40-60 cm) Soil organic carbon content, distribution characteristics and influencing factors of three kinds of vegetation types with medium coverage and low coverage were studied. The results showed that: (1) The contents of organic C in 0 ~ 60 cm soil layer with high, moderate and low coverage were 4.94 ~ 25.89, 4.77 ~ 13.89 and 3.56 ~ 11.42 g · kg ~ (-1) There was significant difference (P <0.05) between soil organic carbon content and low coverage in 20 ~ 40 and 40 ~ 60 cm vegetation cover with middle and lower vegetation cover. The spatial variability of soil organic carbon in high vegetation cover was the highest with low vegetation coverage (2) There was a significant positive correlation between soil organic C content and soil moisture, total nitrogen, total phosphorus and N / P (P <0.01), and soil organic matter content and soil bulk density <0.01). Through multiple linear regression analysis, soil moisture is the key factor that affects soil organic carbon accumulation. The above results can provide a scientific basis for the establishment of wetland protection, management and ecological restoration measures in arid areas.