不同放牧強度對荒漠草原土壤活性有機碳的影響

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中圖分類號：S812.2 文獻標識碼：A 文章編號：1007-0435（2025）08-2541-07

doi：10.11733/j.issn.1007-0435.2025.08.014

Abstract：The effects of different grazing intensities on soil active organic carbon in desert steppe were studied to understand the regulation mechanism of grazing on soil organic carbon，aiming to provide a theoretical basis for reasonable control of grazing intensity. In this study，desert steppe with Stipa breviflora as a dominant spe cies in Inner Mongolia was used as the research object to determine the content of soil organic carbon and its active components，soil physical and chemical properties，abovegroundand belowground biomass and liter amount. The results showed that the soil organic carbon （SOC） content in the non-grazing treatment was significantly higher than that in the grazing treatment （ P<0.05 .With the increase of grazing intensity，the soil total nitrogen（TN） content decreased gradually，and the soil alkaline nitrogen（AN） in non-grazing treatment was significantly higher than that in grazing treatment （ P<0.05 .The soil bulk density（BD）and pH value increased gradually，and the non-grazing treatment was significantly lower than that in grazing treatment （ ?P< O.05）.Aboveground biomass（AGB），belowground biomass（BGB）and liter（L）decreased with the increase of grazing intensity. The corelation analysis of SOC and its components and physical and chemical properties showed that SOC content was significantly positively correlated with soil TN，AN，aboveground biomass （AGB） and content，and SOC content was significantly negatively correlated with soil BD and pH. The results of this study showed that overgrazing significantly reduced soil organic carbon.Therefore，it is recommended to maintain grazing intensity at light grazing（1.54 sheep‘ hm-2?a-1） can effectively maintain grassland productivity and protect soil organic carbon.

Key words：Grazing intensity;Desert steppe;Soil organic carbon;Biomass

在陸地生態(tài)系統(tǒng)的構(gòu)成中，草地生態(tài)系統(tǒng)占據(jù)了至關(guān)重要的位置，它覆蓋了大約5000萬 km2 的土地，并且擁有 28%～39% 的陸地土壤碳儲備，具有極大的碳匯潛力[1-2]，因此，即使草地生態(tài)系統(tǒng)土壤有機碳（Soilorganiccarbon，SOC）含量的微小變化也可能影響全球碳循環(huán)[3]。（剩余11789字）