Effects of Grazing Intensities on the Leaf Anatomical Structure of Plants in an Alpine Meadow in the Qinghai-Tibetan Plateau

doi:10.11733/j.issn.1007-0435.2023.10.013

Acta Agrestia Sinica ›› 2023, Vol. 31 ›› Issue (10): 3018-3025.DOI: 10.11733/j.issn.1007-0435.2023.10.013

Effects of Grazing Intensities on the Leaf Anatomical Structure of Plants in an Alpine Meadow in the Qinghai-Tibetan Plateau

XIAO Qing¹, LIN Zhen-rong¹, JIANG Feng-yan¹, SHI Li-na¹, ZHAO Hong-xin², LI Yong-yuan³, QI Jin-xian³, DANG Zhi-ying⁴, DONG Quan-min⁵, ZHOU Hua-kun⁶, SHAO Xin-qing¹

1. College of Grassland Science and Technology, China Agricultural University, Beijing 100193, China;
2. Qinghai Feeding Grass Technology Promotion Station, Xining, Qinghai Province 810000, China;
3. Yeniugou Forest Farm, Qilian County, Qinghai Province, Haibei Tibetan Autonomous Prefecture, Xining, Qinghai Province 810499, China;
4. Forest Farm in Qilian County, Qinghai Province, Haibei Tibetan Autonomous Prefecture, Xining, Qinghai Province 810499, China;
5. Academy of Animal Husbandry and Veterinary Sciences of Qinghai University, Qinghai Academy of Animal Husbandry and Veterinary Sciences, Key Laboratory of Adaptive Management of Alpine Grassland in Qinghai Province, Xining, Province Qinghai 810016, China;
6. Northwest Institute of Plateau Biology, Chinese Academy of Science, Key Laboratory of Restoration Ecology of Cold Area in Qinghai Province, Xining, Qinghai Province 810001, China

Received:2023-04-28 Revised:2023-07-20 Online:2023-10-15 Published:2023-11-02

放牧强度对高寒草甸优势植物叶片解剖结构的影响

肖晴¹, 林轸荣¹, 姜风岩¹, 石丽娜¹, 赵洪鑫², 李永元³, 祁进贤³, 党志英⁴, 董全民⁵, 周华坤⁶, 邵新庆¹

1. 中国农业大学草业科学与技术学院, 北京 100193;
2. 青海省饲草料技术推广站, 青海西宁 810000;
3. 青海省祁连县野牛沟林场, 青海海北藏族自治州 810499;
4. 青海省祁连县林场, 青海海北藏族自治州 810499;
5. 青海大学畜牧兽医科学院, 青海省畜牧兽医科学院, 青海省高寒草地适应性管理重点实验室, 青海西宁 810016;
6. 中国科学院西北高原生物研究所, 青海省寒区恢复生态学重点实验室, 青海西宁 810001

通讯作者: 邵新庆,E-mail:shaoxinqing@163.com
作者简介:肖晴(2002-),女,汉族,江西九江人,本科生,主要从事草地恢复生态学研究,E-mail:xiaoqing200314@163.com;林轸荣(1997-),男,汉,福建宁德人,硕士研究生,主要是从事草地恢复生态学研究
基金资助:
国家自然科学基金面上项目（32161785和31971746）和青海省创新平台建设专项（2022-ZJ-Y02）资助

Abstract

Abstract: To explore the response mechanism of leaf anatomical structure of dominant plants to grazing. We analyzed the effects of four grazing treatments:no grazing,light grazing,moderate grazing and heavy grazing on the leaf anatomical structural traits of the dominant plants,Kobresia humilis and Stipa purpurea based on a 6-year long-term grazing platform in alpine meadows in Qinghai-Tibetan Plateau. The results showed that grazing disturbance caused a decrease in leaf length and leaf protective tissue thickness of S. purpurea. Increased grazing intensity caused a decrease in leaf length,leaf thickness and maximum xylem vessel diameter and an increase in cuticular thickness and adaxial epidermis thickness of Kobresia humilis. Grazing reduced the difference of maximum xylem vessel diameters among different transport path lengths of the dominant plants. Therefore,leaf anatomical structures were highly plastic and grazing induced adaptive changes of leaf morphological structures of dominant plants in alpine meadows to adapt to grazing disturbances. Further,K. humilis is more sensitive to grazing than S. purpurea.

Key words: Leaf anatomical structure, Alpine meadow, Grazing intensity, Kobresia humilis, Stipa purpurea

摘要： 为探明优势植物叶片解剖结构对放牧的响应机制，本研究以青藏高原高寒草甸为研究对象，依托6年的长期放牧平台，分析了不放牧、轻度放牧、中度放牧和重度放牧4种放牧处理对优势植物矮生嵩草（Kobresia humilis）和紫花针茅（Stipa purpurea）叶解剖结构性状的影响。结果显示：放牧干扰造成紫花针茅叶长减小、叶保护组织厚度整体呈下降趋势；放牧强度的增加导致矮生嵩草叶长减小、叶厚变薄、最大导管直径减小，角质层厚和近轴面表皮细胞厚呈上升趋势。放牧会缩小优势植物最大导管直径在不同运输路径长度间的差异。因此，放牧促使高寒草甸优势植物的叶形态结构产生适应性变化以适应放牧干扰，反映了叶解剖结构具有高度的可塑性，并且矮生嵩草对放牧的敏感性较强。

关键词: 叶片解剖结构, 高寒草甸, 放牧强度, 矮生嵩草, 紫花针茅

CLC Number:

S821.4+3

XIAO Qing, LIN Zhen-rong, JIANG Feng-yan, SHI Li-na, ZHAO Hong-xin, LI Yong-yuan, QI Jin-xian, DANG Zhi-ying, DONG Quan-min, ZHOU Hua-kun, SHAO Xin-qing. Effects of Grazing Intensities on the Leaf Anatomical Structure of Plants in an Alpine Meadow in the Qinghai-Tibetan Plateau[J]. Acta Agrestia Sinica, 2023, 31(10): 3018-3025.

肖晴, 林轸荣, 姜风岩, 石丽娜, 赵洪鑫, 李永元, 祁进贤, 党志英, 董全民, 周华坤, 邵新庆. 放牧强度对高寒草甸优势植物叶片解剖结构的影响[J]. 草地学报, 2023, 31(10): 3018-3025.

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Effects of Grazing Intensities on the Leaf Anatomical Structure of Plants in an Alpine Meadow in the Qinghai-Tibetan Plateau

放牧强度对高寒草甸优势植物叶片解剖结构的影响

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