草地学报

草地学报 ›› 2026, Vol. 34 ›› Issue (3): 917-928.DOI: 10.11733/j.issn.1007-0435.2026.03.016

• 研究论文 • 上一篇    

环境因子和围栏封育对藏北高寒草甸常见牧草耐寒生理指标的影响

陈林耀1,2, 刘楠3, 马娇林3, 郭荣明3, 夏茂林3, 万运帆1, 武建双1,2   

  1. 1. 中国农业科学院农业环境与可持续发展研究所, 北京 100081;
    2. 中国农业科学院国家南繁研究院, 海南 三亚 572024;
    3. 西藏自治区动物疫病预防控制中心(西藏自治区畜牧总站), 西藏 拉萨 850000
  • 收稿日期:2025-05-08 修回日期:2025-09-18 发布日期:2026-03-23
  • 通讯作者: 武建双，E-mail：wujianshuang@caas.cn
  • 作者简介:陈林耀（2001-），男，汉族，福建清流人，硕士研究生，主要从事青藏高原高寒植物抗逆生理研究，E-mail：chenlinyao123@out?look.com；
  • 基金资助:
    西藏自治区科技计划重点研发及转化重点项目“基于牧草产量和营养品质耦合的藏北羌塘高寒草地承载力研究”（XZ202501ZY0042）资助

Effects of Environmental Factors and Livestock Grazing Exclusion on Physiological Indicators of Cold-Tolerance of Common Forage Species in Alpine Meadows on North Tibet Plateau

CHEN Lin-yao1,2, LIU Nan3, MA Jiao-lin3, GUO Rong-ming3, XIA Mao-lin3, WAN Yun-fan1, WU Jian-shuang1,2   

  1. 1. Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China;
    2. National Nanfan Research Institute, Chinese Academy of Agricultural Sciences, Sanya, Hainan Province 572024, China;
    3. Tibet Autonomous Region Animal Disease Control Center (Tibet Animal Husbandry Service Center), Lhasa, Xizang 850000, China
  • Received:2025-05-08 Revised:2025-09-18 Published:2026-03-23

PDF

摘要： 低温是影响高寒草甸植物生长的关键环境因子。本研究选取高寒草甸4类功能群常见植物，测定其耐寒生理指标，探究封育、气候、土壤及群落特征的影响路径。结果表明：（1）耐寒生理指标在物种和功能群之间差异显著，封育无显著影响；（2）在群落水平上，丙二醛、过氧化物酶、过氧化氢酶与降水正相关，超氧化物歧化酶与气温正相关，可溶性糖、超氧化物歧化酶与土壤氮含量负相关，可溶性糖、可溶性蛋白与土壤磷含量负相关，脯氨酸、可溶性糖、过氧化氢酶与物种丰富度及香农指数负相关，脯氨酸与辛普森指数负相关，地上生物量与丙二醛和过氧化氢酶负相关（P<0.05）；（3）结构方程结果显示，高寒草甸植物地上生物量受气温和抗氧化酶活性直接影响，其路径强度分别为0.39和-0.41；土壤养分和群落结构通过细胞间渗透压调节物质间接影响抗氧化酶活性，其作用强度为-0.13和-0.18；降水通过抗氧化酶活性间接地影响地上生物量，其作用强度为-0.30。建议未来着重探究耐寒生理指标与环境因子交互作用对高寒草甸植物生存的影响机理。

关键词: 高寒草甸, 群落加权平均值, 放牧管理, 植物功能群, 土壤养分

Abstract: Low-temperature stress is a critical factor regulating plant growth in alpine meadows on the Tibetan Plateau. This study selected common forage species from four functional groups in alpine meadows in North Tibet， measured their cold-tolerance-related physiological indicators， and explored the impact pathways of livestock grazing exclusion， climatic conditions， soil nutrients， and plant community structural regimes. The results showed that （1） cold tolerance-related physiological indicators were significantly different among species and plant functional groups （P<0.05） without significant differences between inside and outside of the fences for grazing exclusion； （2） at the community level， malondialdehyde （MDA）， peroxidase （POD）， and catalase （CAT） activities were positively correlated with growing season precipitation （GSP）； superoxide dismutase （SOD） activity was positively correlated with growing season temperature （GST）； soluble sugar （SS） and SOD were negatively correlated with soil total nitrogen （STN）； SS and soluble protein （SP） were negatively correlated with soil total phosphorus （STP）； proline （Pro）， SS， and CAT were negatively correlated with species richness and the Shannon-Wiener index； Pro was negatively correlated with the Simpson's diversity index； and aboveground biomass （AGB） was negatively correlated with MDA and CAT （P<0.05）； （3） the structural equation modeling （SEM） revealed that AGB was directly affected by temperature and antioxidant enzyme activity， with path coefficients of 0.39 and -0.41， respectively. Soil nutrients and community structure indirectly affected antioxidant enzyme activity through osmoregulatory substances， with effect sizes of -0.13 and -0.18， respectively. Precipitation affected AGB indirectly through antioxidant enzyme activity， with an effect size of -0.30. It is recommended to elucidate the mechanisms underlying interactions between cold tolerance-related physiological indices and environmental variables on plant survival in alpine meadows in further studies.

Key words: Alpine meadow, Community-weighted mean, Livestock grazing management, Plant functional groups, Soil nutrients

中图分类号: