草地学报 ›› 2024, Vol. 32 ›› Issue (1): 239-247.DOI: 10.11733/j.issn.1007-0435.2024.01.025

• 研究论文 • 上一篇    下一篇

放牧、氮添加对荒漠草原植物和土壤碳氮的影响

李宏宇1,2, 高翠萍1,2, 吕广一1,2, 杨昌祥3, 张春英3, 王成杰1,2   

  1. 1. 内蒙古农业大学草原与资源环境学院, 内蒙古 呼和浩特 010011;
    2. 内蒙古农业大学草地资源教育部重点实验室, 内蒙古呼和浩特 010011;
    3. 内蒙古乌兰察布市化德县林业和草原局, 内蒙古 乌兰察布 012000
  • 收稿日期:2023-06-12 修回日期:2023-08-28 出版日期:2024-01-15 发布日期:2024-01-30
  • 通讯作者: 王成杰,E-mail:nmgcjwang3@163.com
  • 作者简介:李宏宇(1998-),女,汉族,内蒙古赤峰人,硕士研究生,主要从事草地资源生态与管理研究,E-mail:hongyuli0608@163.com
  • 基金资助:
    内蒙古自治区“科技兴蒙”国际合作引导项目(2021CG0020);国家自然科学基金项目(31960357,31460125)资助

Effects of Grazing and Nitrogen Addition on Desert Grassland Plants and Soil Carbon and Nitrogen

LI Hong-yu1,2, GAO Cui-ping1,2, LYU Guang-yi1,2, YANG Chang-xiang3, ZHANG Chun-ying3, WANG Cheng-jie1,2   

  1. 1. College of Grassland and Resource Environment, Inner Mongolia Agricultural University, Hohhot 010011, Inner Mongolia 010011, China;
    2. Key Laboratory of Grassland Resources of the Ministry of Education, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010011, China;
    3. Forestry and Grassland Bureau, Hade County, Ulanqab City, Inner Mongolia;Ulanqab, Inner Mongolia 012000, China
  • Received:2023-06-12 Revised:2023-08-28 Online:2024-01-15 Published:2024-01-30

摘要: 为了探究放牧和氮添加对内蒙古荒漠草原植物-土壤碳、氮循环的影响,在禁牧(UG,0只羊单位·hm-2)和重度放牧(HG,1.74只羊单位·hm-2)样地进行氮添加处理,各处理水平为:对照(CK,0 g·m-2·a-1)、低氮(LN,5 g·m-2·a-1)、中氮(MN,10 g·m-2·a-1)和高氮(HN,20 g·m-2·a-1)。通过对短花针茅(Stipa breviflora)叶片和土壤全碳(Total carbon,TC)、全氮(Total nitrogen,TN)、稳定碳同位素(Stable carbon isotopes,δ13C)、稳定氮同位素(Stable nitrogen isotopes,δ15N)及土壤有机碳(Soil organic carbon,SOC)、速效氮(Available nitrogen,AN)的测定分析,结果表明:放牧显著增加土壤TC、TN和AN含量(P<0.05);放牧使短花针茅叶片δ13C,δ15N值显著减小(P<0.05);氮添加使短花针茅叶片δ15N值显著减小(P<0.05)。放牧和氮添加在一定程度上均加速了短花针茅和土壤的养分循环,同时氮添加对短花针茅的氮吸收及分馏效应有一定影响,对退化草地恢复起重要作用。

关键词: 荒漠草原, 氮添加, 植物和土壤, 碳氮含量, 稳定同位素

Abstract: In order to investigate the effects of grazing and nitrogen addition on plant-soil carbon and nitrogen cycling in Inner Mongolian desert grasslands, nitrogen addition treatments were carried out in forbidden (UG, 0 sheep unit·hm-2) and heavily grazed (HG, 1.74 sheep unit·hm-2) sample plots at the following levels:control (CK, 0 g·m-2·a-1), low nitrogen (LN, 5 g·m-2·a-1), medium nitrogen (MN, 10 g·m-2·a-1) and high nitrogen (HN, 20 g·m-2·a-1), total nitrogen (TN), stable carbon isotopes (δ13C), stable nitrogen isotopes (δ15N), soil organic carbon (SOC) and available nitrogen (AN) were measured and analyzed, and the results showed that:Grazing significantly increased the content of TC, TN and AN in the soil (P<0.05);Grazing significantly reduced the values of δ13C and δ15N of the leaves of Stipa breviflora needlegrass (P<0.05);grazing significantly reduced the δ13C and δ15N values of Stipa breviflora leaves (P<0.05). To a certain extent, both grazing and nitrogen addition accelerated the nutrient cycling of fagus sylvatica and soil, and at the same time, nitrogen addition had a certain effect on nitrogen uptake and fractionation of fagus sylvatica, which is important for the recovery of degraded grassland.

Key words: Desert grassland, Nitrogen addition, Plants and soil, Carbon and nitrogen content, Stable isotopes

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