青海省不同高寒草地土壤主要养分及可溶性有机碳特性研究
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摘要
为探索不同高寒草地类型中土壤有机碳、养分和可溶性有机碳的含量差异以及可溶性有机碳分布特征,以青海省4个高寒草地类型土壤0～10 cm和10～20 cm土层为研究对象,分析了土壤有机碳、全氮、全磷、全钾、可溶性有机碳含量,以及可溶性有机碳芳香性指数和腐殖化指数,并进一步探讨了可溶性有机碳含量与土壤有机碳、各养分含量之间的相关性。结果表明,不同高寒草地类型各土层土壤中全氮、有机碳、可溶性有机碳含量由高到低的顺序依次为:高寒草甸类>高寒草甸草原类>高寒草原类>高寒荒漠类,且不同类型之间差异显著(P<0.05)。随着土层的加深,土壤全氮、有机碳含量有降低趋势。不同类型高寒草地各土层土壤中可溶性有机碳的芳香性指数和腐殖化指数表现出与此相同的变化趋势。不同高寒草地各土层中可溶性有机碳与土壤全氮、有机碳含量之间均呈现出显著正相关关系(P<0.05)。综上所述,高寒草甸和高寒草甸草原土壤有机碳、全氮、可溶性有机碳含量较高,结构复杂。可溶性有机碳的芳香性指数和腐殖化指数在一定程度上能够反映土壤养分状况。
This study aimed to explore the differences in soil carbon, soil nutrients and soluble organic carbon, and their correlation with soil nutrient levels in 4 different types of alpine grassland in Qinghai province. Measurements made included: soil organic carbon, total nitrogen, total phosphorus, total potassium, and soluble organic carbon in the 0-10 cm and 10-20 cm soil layers. Correlations between soluble organic carbon and organic carbon and nutrients were determined. The results showed that the ranking of the grassland types for contents of total nitrogen, organic carbon and soluble organic carbon in tested soil layers was alpine meadow>alpine meadow steppe>alpine steppe>alpine desert, with the differences being significant(P<0.05). As expected, the soil total nitrogen and organic carbon content tended to decrease with increasing soil depth. The soluble organic carbon aromaticity and humus indexes for the different alpine grassland types had the same rankings as for total nitrogen and organic carbon, above. There was a significant positive correlation between soluble organic carbon and soil total nitrogen and organic carbon(P<0.05). It was concluded that the contents of organic carbon, total nitrogen and soluble organic carbon in alpine meadow and alpine meadow steppe were high, and the structure of organic matter was complex. The soluble organic carbon aromaticity and humus indices were, to a certain degree, indicative of soil nutrient status.
This study aimed to explore the differences in soil carbon, soil nutrients and soluble organic carbon, and their correlation with soil nutrient levels in 4 different types of alpine grassland in Qinghai province. Measurements made included: soil organic carbon, total nitrogen, total phosphorus, total potassium, and soluble organic carbon in the 0-10 cm and 10-20 cm soil layers. Correlations between soluble organic carbon and organic carbon and nutrients were determined. The results showed that the ranking of the grassland types for contents of total nitrogen, organic carbon and soluble organic carbon in tested soil layers was alpine meadow>alpine meadow steppe>alpine steppe>alpine desert, with the differences being significant(P<0.05). As expected, the soil total nitrogen and organic carbon content tended to decrease with increasing soil depth. The soluble organic carbon aromaticity and humus indexes for the different alpine grassland types had the same rankings as for total nitrogen and organic carbon, above. There was a significant positive correlation between soluble organic carbon and soil total nitrogen and organic carbon(P<0.05). It was concluded that the contents of organic carbon, total nitrogen and soluble organic carbon in alpine meadow and alpine meadow steppe were high, and the structure of organic matter was complex. The soluble organic carbon aromaticity and humus indices were, to a certain degree, indicative of soil nutrient status.
引文
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