Effects of different land-use types on soil active organic carbon in the Stipa klemenaii desert steppe of Inner Mongolia

doi:10.11686/cyxb2015537

Abstract

Abstract: In order to explore variation in the contents and components of soil active organic carbon under different land-use types in the Stipa klemenaii steppe of Inner Mongolia, five field treatments were studied. These treatments included three grazing intensities, 0.50 sheep/hm² (G_0.50), 0.94 sheep/hm² (G_0.94) and 1.25 sheep/hm² (G_1.25), as well as one fenced enclosure and one tract of reclamation land. Analysis was undertaken to determine the contents of soil organic carbon (SOC), soil dissolved organic carbon (DOC), soil readily oxidizable organic carbon (ROC), soil microbial carbon (MBC) and soil physical and chemical properties: total nitrogen (TN), total phosphorus (TP), and carbon nitrogen ratio (C/N). The results showed that the contents of SOC, TN, TP and C/N were in the following order: enclosure>G_0.50>G_0.94>reclamation>G_1.25. The contents of soil organic carbon and TN of the fenced enclosure were significantly higher than that of G_0.94, G_1.25 and the reclamation land (P<0.05). The contents of SOC, TN, TP and C/N showed a gradually decreasing trend with the increase of stocking rates. Grazing and reclamation significantly decreased the contents of DOC, ROC and MBC when compared to enclosure (P<0.05). The contents of SOC and soil active organic carbon decreased gradually with the increase of stocking rates. In general, the allocation proportion of active organic carbon increased in 0-20 cm soil layers after 4 years of fenced enclosure in the S. klemenaii steppe, whereas it decreased after grazing and reclamation. The MBC/SOC of the fenced enclosure was significantly higher than that of grazing and reclamation (P<0.05). The contents of SOC, DOC, ROC and MBC had a significant positive relationship with each other (P<0.05). Soil active organic carbon and soil physical and chemical properties had a close relationship. These results indicate that fenced enclosure enhances soil quality and improves the S. klemenaii steppe environment.

QIU Xuan, ZHAO Jian-Ning, LI Wen-Ya, ZHANG Nai-Qin, YANG Dian-Lin. Effects of different land-use types on soil active organic carbon in the Stipa klemenaii desert steppe of Inner Mongolia[J]. Acta Prataculturae Sinica, 2016, 25(9): 1-9.

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