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中国沙漠 ›› 2025, Vol. 45 ›› Issue (2): 119-128.DOI: 10.7522/j.issn.1000-694X.2024.00109

• • 上一篇    

放牧强度对红砂( Reaumuria soongorica )灌丛土壤碳氮磷化学计量比及繁殖性状的影响

汪正蛟一1,2,3,5(), 陈敏1,2,3(), 王怀海1,2,3,5, 白浩江4,5, 宋兆斌1,2,3,5, 张晓雪1,2,3,5   

  1. 1.中国科学院西北生态环境资源研究院,干旱区生态安全与可持续发展国家重点实验室,甘肃 兰州 730000
    2.中国科学院西北生态环境资源研究院,乌拉特荒漠草原研究站,甘肃 兰州 730000
    3.中国科学院西北生态环境资源研究院,寒区旱区逆境生理与生态重点实验室,甘肃 兰州 730000
    4.中国科学院西北生态环境资源研究院,奈曼沙漠化研究站,甘肃 兰州 730000
    5.中国科学院大学,北京 100049
  • 收稿日期:2024-07-02 修回日期:2024-11-11 出版日期:2025-03-20 发布日期:2025-03-26
  • 通讯作者: 陈敏
  • 作者简介:汪正蛟一(1999—),男,甘肃兰州人,硕士研究生,主要从事荒漠生态学和植物繁殖生态学方面研究。E-mail: wzjy1124@163.com
  • 基金资助:
    中国科学院西部之光A类项目(E129050301)

Effects of grazing intensities on soil carbonnitrogenphosphorus stoichiometric ratiosin andreproductive traits of Reaumuria soongorica

Zhengjiaoyi Wang1,2,3,5(), Min Chen1,2,3(), Huaihai Wang1,2,3,5, Haojiang Bai4,5, Zhaobin Song1,2,3,5, Xiaoxue Zhang1,2,3,5   

  1. 1.Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands /, Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    2.Urat Desert-grassland Research Station /, Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    3.Key Laboratory of Stress Physiology and Ecology in Cold and Arid Region /, Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    4.Naiman Desertification Research Station, Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China
    5.University of Chinese Academy of Sciences,Beijing 100049,China
  • Received:2024-07-02 Revised:2024-11-11 Online:2025-03-20 Published:2025-03-26
  • Contact: Min Chen

摘要:

荒漠草原生态系统在维持生态平衡和防止土地退化方面具有重要作用,但由于其脆弱性,易受到放牧等人类活动的影响。植物通过从土壤中获取并分配资源来确保生长和繁殖。然而,不同放牧条件下土壤养分含量及其化学计量比对植物繁殖性状的影响仍不明确。本研究通过在内蒙古乌拉特荒漠草原的长期试验,探讨了禁牧、中度放牧、重度放牧强度对荒漠草原优势物种红砂(Reaumuria soongorica)灌丛土壤化学计量比及繁殖特性的影响。结果显示:(1)放牧显著影响土壤养分含量及其化学计量比,促进土壤中全碳和全氮积累,降低全磷含量,适度放牧可优化土壤表层C∶N;随着放牧强度增加,土壤C∶N、C∶P和N∶P呈现增长趋势,影响植物对养分的吸收利用。(2)土壤C∶N被认定为影响植物繁殖的关键因子。红砂灌丛有机质分解可能受磷元素限制,而生长繁殖更多受氮元素限制。(3)放牧通过改变土壤养分和化学计量比,间接影响了红砂的生长和繁殖。红砂通过减少种子数量、提高种子质量应对放牧压力。放牧显著降低了红砂的平均种子数,但提高了种子的百粒重、结籽率和雌性适合度。

关键词: 放牧强度, 土壤化学计量比, 繁殖性状, 雌性适合度

Abstract:

The desert steppe ecosystem plays a crucial role in maintaining ecological balance and preventing land degradation, but its vulnerability makes it highly susceptible to human activities such as grazing. Plants acquire and allocate resources from the soil, which is essential for their growth and reproduction. However, research on the effects of soil nutrient content and stoichiometry among different grazing conditions on plant reproductive traits is still limited. This study conducted long-term experiments with three different grazing intensities (e.g., no-grazing, moderate grazing, and heavy grazing) in Inner Mongolia to explore how grazing intensity affects the soil stoichiometry and reproductive traits of the dominant species of the desert steppe, Reaumuria soongorica. The results demonstrated that: (1) Grazing significantly affects soil nutrient content and stoichiometry, promoting the accumulation of total carbon (TC) and total nitrogen (TN) while reducing total phosphorus (TP) levels. Moderate grazing can adjust the C∶N on the soil surface. With increasing grazing intensity, the soil C∶N, C∶P, and N∶P showed an upward trend, impacting shrubs’ nutrients absorption and utilization. (2) The soil C∶N has been recognized as a critical factor influencing plant reproduction. The decomposition of organic matter in R. soongorica may be limited by phosphorus, and its growth and reproduction are more limited by nitrogen. (3) Grazing influences the growth and reproduction of R. soongorica shrubs by affecting soil nutrients contents and stoichiometry. In response to grazing, R. soongorica reduced seed quantity but enhance seed quality. Grazing significantly reducing the mean number of seeds, while increasing the hundred-grain weight, seed-setting rate, and female fitness. Our study provided important scientific basis for the protection of the Yellow River Basin and the desert grassland degradation and restoration.

Key words: grazing intensity, soil stoichiometric, reproduction traits, female fitness

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