Acta Agrestia Sinica ›› 2015, Vol. 23 ›› Issue (2): 271-276.DOI: 10.11733/j.issn.1007-0435.2015.02.009

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Ecological Responses of Belowground Biomass and Soil Characteristics to Different Grazing Rest Modes in Alpine Meadow-Steppe

LI Wen, CAO Wen-xia, XU Chang-lin, SHI Shang-li, LI Xiao-long, ZHANG Xiao-jiao, LIU Hao-dong   

  1. Grassland Science College of Gansu Agricultural University, Grassland Ecosystem Key Laboratory of Ministry of Education, Sino-U.S. Research Centers for Sustainable Grassland and Livestock Management, Lanzhou, Gansu Province 730030, China
  • Received:2014-03-31 Revised:2014-06-12 Online:2015-04-15 Published:2015-03-25

不同休牧模式对高寒草甸草原土壤特征及地下生物量的影响

李文, 曹文侠, 徐长林, 师尚礼, 李小龙, 张小娇, 刘皓栋   

  1. 甘肃农业大学草业学院 草业生态系统教育部重点实验室 中-美草地畜牧业可持续发展研究中心, 甘肃 兰州 730070
  • 通讯作者: 曹文侠
  • 作者简介:李文(1987-),男,甘肃会宁人,硕士研究生,主要研究方向为草地生态与资源管理,E-mail:670410113@qq.com
  • 基金资助:

    国家自然科学基金(31360569);现代农业产业技术体系(CARS-35);甘肃省退牧还草科技支撑项目(2012-252-2)资助

Abstract:

Belowground biomasses and soil characteristics of non-grazing during growing stage, non-grazing in summer and non-grazing for the whole year patterns were investigated in the alpine meadow-steppe of Qinghai-Tibet Plateau. The bulk densities, soil compaction, soil water contents, organic matter and root biomasses of the three patterns were compared and analyzed. The results showed that the bulk densities and soil compaction of non-grazing during growing stage pattern were lower than those of non-grazing in summer pattern. The soil water content of non-grazing during growing stage pattern was higher than that of non-grazing in summer pattern. The organic carbon and root biomasses of non-grazing during growing stage pattern were higher than those of non-grazing in summer pattern in the 0~30 cm soil layers. Non-grazing for the whole year pattern made root biomass distribute in the surface layer of soil, while non-grazing in summer pattern significantly increased the root biomass of 10~20 cm soil layer compared to other grazing patterns. Therefore, non-grazing for a short period is one of the main ways of improving production ability and ecological rehabilitation for degraded grassland.

Key words: Alpine meadow-steppe, Rest grazing patterns, Soil characteristics, Belowground biomass

摘要:

以土壤特征及地下生物量为主要指标研究了东祁连山高寒草甸草原对全生长季休牧、传统夏季休牧和禁牧的响应,以期为该区草地恢复、保护和管理提供支撑.结果表明:与传统夏季休牧相比,禁牧和全生长季休牧改良了高寒草甸草原0~20 cm土壤物理结构,降低了土壤的紧实度,但对深层土壤影响较小;禁牧和全生长季休牧不同程度地改善了高寒草甸草原土壤的持水能力;禁牧显著增加了0~30 cm土壤有机碳含量,全生长季休牧增加了高寒草甸草原表层土壤有机碳含量;禁牧极显著增加了0~10 cm土层根系生物量,而传统夏季休牧草地10~20 cm土层的根系生物量显著高于禁牧与全生长季休牧.说明短期禁牧和全生长季休牧是提升青藏高原高寒草甸草原生产力与生态恢复的重要措施之一.

关键词: 高寒草甸草原, 休牧模式, 土壤特征, 地下生物量

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