绵羊在典型的草原中践踏土壤有机碳库存的并发和遗留影响,中国
Lan Li1, Xiong Zhao He2, Jing Zhang1
1State Key Laboratory of Herbage Improvement and Grassland Agro-ecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, Engineering Technology Research Center for Ecological Restoration and Utilization of Degraded Grassland in Northwest China, National Forestry and Grassland Administration, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China.
Journal of environmental management
|August 9, 2024
概括
模拟的绵羊践踏影响草原土壤碳和植物生物质. 低强度的践踏,特别是在40 hoofprints m-2时,随着时间的推移,有利于生态系统功能和土壤健康.
科学领域:
- 生态生态学 生态生态学
- 土壤科学 土壤科学
- 生物地质化学生物地质化学
背景情况:
- 牧场显著影响生态系统中的土壤碳 (C) 动态.
- 非性相互作用,如草食动物的践踏,影响土壤过程,但其影响是复杂的.
- 在实地实验中,将踩踏的并发和遗留效应分开是具有挑战性的.
研究的目的:
- 调查模拟羊践踏草原生态系统属性的并发和遗留影响.
- 为了确定不同强度的践踏对土壤生物地质化学和植物社区的影响.
- 为典型的草原生态系统确定最佳的牧场管理策略.
主要方法:
- 进行了为期2年的模拟绵羊践踏实验,进行了四次强度治疗 (0,40,80,120 hoofprints m-2).
- 测量包括地面生物量 (AGB),地下生物量 (BGB),土壤有机碳 (SOC),土壤营养物质的可用性 (N, P) 和土壤散装密度 (BD).
- 在治疗年 (2017年) 评估了并发效应,并在停止践踏后两年 (2019年) 评估了遗留效应.
主要成果:
- 同时踩踏降低了AGB,射击C度和土壤可用的N和P,同时增加了土壤散装密度,并在更高的强度下降了SOC库存.
- 遗留效应显示植物多样性和BGB增加,但土壤可用的N和P减少.SOC库存在T80.0下降.
- 低强度践踏 (T40) 显示了有益的遗留效应,保持了大多数植物和土壤功能,表明适合适应性管理.
结论:
- 短期,低强度的践踏可以保持草原功能,而其遗留效应可能是有益的.
- 踩踏强度为40 hoofprints m-2 (相当于2.7羊ha-1) 是典型的草原适应性管理的最佳.
- 在更高的养殖率下维持生态系统功能需要诸如旋转和季节性放牧等策略,以允许植被和土壤恢复.
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