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Effects of Rest Grazing on Organic Carbon Storage in Stipa grandis Steppe in Inner Mongolia, China

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文摘 This study was aimed to evaluate the potential effects of rest grazing on organic carbon storage in Stipa grandis steppe of Inner Mongolia, China. Using potassium dichromate heating method, we analyzed the organic carbon storage of plant and soil in Stipa grandis steppe after rest grazing for 3, 6, and 9 yr. The results indicated that as the rest grazing ages prolonged, the biomass of aboveground parts, litter and belowground plant parts (roots) of the plant communities all increased, meanwhile the C content of the biomass increased with the rest grazing ages prolonging. For RG_0, RG_(3a), RG_(6a), and RG_(9a), C storage in aboveground vegetation were 60.7, 76.9, 82.8 and 122.2 g Cm~(-2), respectively;C storage of litter were 5.1, 5.8, 20.4 and 25.5 g Cm~(-2), respectively;C storage of belowground roots (0-100 cm) were 475.2, 663.0, 1 115.0 and 1 867.3 g Cm~(-2), respectively;C storage in 0-100 cm soil were 13.97, 15.76, 18.60 and 32.41 kg Cm~(-2), respectively. As the rest grazing ages prolonged, the organic C storage in plant communities and soil increased. The C storage of belowground roots and soil organic C was mainly concentrated in 0-40 cm soil body. The increased soil organic C for RG_(3a) accounted for 89.8% of the increased carbon in vegetation-soil system, 87.2%for RG_(6a), and 92.6%for RG_(9a). From the perspective of C sequestration cost, total cost for RG_(3a), RG_(6a), and RG_(9a) were 2 903.4, 5 806.8 and 8 710.2 CNY ha~(-1), respectively. The cost reduced with the extension of rest grazing ages, 0.15 CNY kg~(-1) C for RG_(3a), 0.11 CNY kg~(-1) C for RG_(6a) and 0.04 CNY kg~(-1) C for RG_(9a). From the growth characteristics of grassland plants, the spring was one of the two avoided grazing periods, timely rest grazing could effectively restore and update grassland vegetation, and was beneifcial to the sustainable use of grassland. Organic C storage for RG_(9a) was the highest, while the cost of C sequestration was the lowest. Therefore, spring rest grazing should be encouraged because it was proved to be a very efifcient grassland use pattern.
来源 Journal of Integrative Agriculture ,2014,13(3):624-634 【核心库】
DOI 10.1016/s2095-3119(13)60720-0
关键词 rest grazing ; Stipa grandis steppe ; organic carbon density ; organic carbon storage ; carbon sequestration beneifts
地址

Environmental Protection and Monitoring Institute, Ministry of Agriculture, Tianjin, 300191

语种 英文
文献类型 研究性论文
ISSN 2095-3119
学科 地质学;环境科学基础理论
基金 was supported by the National Natural Science Foundation of China ;  the Key Technologies R&D Program of China during the 12th Five-Year Plan period
文献收藏号 CSCD:5097633

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