植物的功能特征和生物多样性可以揭示生态系统功能对放牧的反应
Shan Jiang1, Jinghui Zhang1, Yiwei Tang1
1Ministry of Education Key Laboratory of Ecology and Resource Use of the Mongolian Plateau & Inner Mongolia Key Laboratory of Grassland Ecology, School of Ecology and Environment, Inner Mongolia University, Hohhot 010021, China.
The Science of the total environment
|July 24, 2023
概括
畜牧放牧通过减少地面生物质 (AGB) 和改变功能特征,影响沙漠草原植物群落. 在具有收购性植物特征的多种社区中观察到更高的放牧影响,导致生长速度减缓.
科学领域:
- 生态生态学 生态生态学
- 植物的功能特征 植物的功能特征
- 生态系统动态生态系统动态
背景情况:
- 植物的功能特征影响生态系统对放牧等干扰的反应.
- 沙漠草原的牲畜放牧,植物特征和地表生物量 (AGB) 之间的关系仍然不清楚.
- 了解这些相互作用对于管理牧场至关重要.
研究的目的:
- 调查畜牧放牧对蒙古高原沙漠草原植物群体结构和功能特征的影响.
- 为了确定牧场是否对收购性特征或高生物多样性社区的影响更大,AGB.
- 分析放牧影响,植物特征和多样性指数之间的相关性.
主要方法:
- 在放牧和控制社区测量了22个功能特征.
- 分析了放牧对AGB的影响,社区加权平均 (CWM) 特征,物种多样性和功能多样性 (FD).
- 使用日志响应比率 (LRR) 估计的牧场影响,并检查了与植物生长和CWM特征的相关性.
主要成果:
- 放牧增加了CWM干物质含量和C:N比率,同时降低了CWM高度,特定叶面积 (SLA),N和P含量.
- 地表生物量 (AGB) 减少,而在牧场下,物种多样性和功能多样性 (FD) 增加.
- 较高的LRR (牧场影响) 发现在具有收获性叶片特征和较高生物多样性的社区,植物生长较低.
结论:
- 植物特征和生物多样性预测AGB对放牧的反应,具有收购性特征和高多样性导致更大的放牧影响.
- 牧场诱导的特征转移表明一种避免策略,可能会增强适应低资源环境的适应性.
- 草食动物的选择性食是减少AGB的关键驱动力,首选的补丁可能会恢复得更慢,生物量减少.
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