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为了揭示青藏高原高寒草甸生态系统植被变化对碳储量的影响,以原生矮嵩草草甸、退化草甸、人工草地以及农田为研究对象,对比分析了该4种不同土地格局下生态系统的有机碳现状。以原生矮嵩草草甸土壤碳储量为基准对不同类型高寒生态系统的碳增汇潜力进行了估算。结果表明:不同类型生态系统的碳储量和碳增汇潜力有很大差异,在0—40cm土层中,(1)原生草甸碳储量最高,达到17098 g C/m2,退化草甸、人工草地和农田的有机碳汇增加潜力分别为:5637、3823、1567 g C/m2。(2)对于退化草甸和人工草地,土壤有机碳含量和密度明显低于原生草甸和农田。(3)地下生物量碳储量主要集中在0—20cm,且原生草甸地下生物量的碳储量比其他3个植被类型高3.6—5倍。总体上,青藏高原草地生态系统存在巨大的碳增汇潜力。
In order to reveal the effects of vegetation changes on carbon storage of alpine meadow ecosystem in the Qinghai-Tibet Plateau, the effects of the four types of ecosystem on the carbon storage were studied with the native Kobresia meadow, degraded meadow, artificial grassland and farmland as the research objects Status of organic carbon. Carbon sink potential of different types of alpine ecosystems was estimated based on soil carbon storage of native Kobresia humilis meadow. The results showed that there was a great difference between the carbon storage and carbon sink potential of different types of ecosystems. Among the 0-40 cm soil layers, (1) the carbon storage of primary meadow was the highest, reaching 17098 g C / m2, degraded meadow, artificial The potential increases of organic carbon sinks in grassland and farmland are respectively 5637, 3823 and 1567 g C / m2. (2) For degraded meadow and artificial grassland, the content and density of soil organic carbon were significantly lower than those of native meadow and farmland. (3) The underground biomass carbon reserves are mainly concentrated in 0-20cm, and the carbon stocks of the underground biomass in native meadow are 3.6-5 times higher than the other three vegetation types. In general, there is a huge carbon sink potential for grassland ecosystems in the Qinghai-Tibet Plateau.