根系获取和叶子分配之间的相关性揭示了放牧如何促进植物利用
Jirui Gong1, Liangyuan Song2, Zihe Zhang1
1State Key Laboratory of Earth Surface Processes and Resource Ecology, MOE Engineering Research Center of Desertification and Blown-sand Control, Faculty of Geographical Science, Beijing Normal University, Beijing, 100875, China.
Plant physiology and biochemistry : PPB
|February 27, 2024
概括
牧场增强了草原 (P) 的吸收和利用在主导草,中国草 (Leymus chinensis) 和大 (Stipa grandis). 中等放牧强度优化了植物生长和P的使用,支持可持续的畜牧生产.
科学领域:
- 生态生态学 生态生态学
- 植物生理学 植物生理学
- 生物地质化学生物地质化学
背景情况:
- 过度放牧和 (P) 缺乏限制了草原的可持续性.
- 了解草地上植物P策略是管理草原生态系统的关键.
- 叶子P分配和根P获取是关键的适应机制,但它们对放牧的反应尚不清楚.
研究的目的:
- 研究放牧如何影响叶子P分数,根P获取特征和莱姆斯chinensis和Stipa grandis的基因表达.
- 确定在不同放牧强度下P分配,根特征和土壤特性之间的相关性.
- 澄清P利用策略在植物补偿生长和可持续畜牧业生产中的作用.
主要方法:
- 在内蒙古的一个牧场强度梯度的实地研究.
- 对叶子P分数,根P获取特征和L. chinensis和S. grandis的基因表达的分析.
- 评估树根球和土壤质量和土壤质量.
主要成果:
- 放牧诱导了补偿生长,增加了树根球P的可用性,并在两种物种中减少了P的限制.
- 林氏素 (L. chinensis) 显示叶子代谢物P的增加,与根排泄物和无机P吸收有关.
- 斯.格兰迪斯表现出叶子核酸P的增加,与细根,根排泄物和上调的防御/P代谢基因有关.
- 有效的根P动员和吸收特征,以及增加的叶子代谢P,支持在放牧下的植物生长,在耕种类型之间存在差异.
结论:
- 在牧场下的植物补偿生长得到了有效的根 P 调动和吸收以及增加的叶子代谢 P 分数的支持.
- 在放牧期间观察到P分配和根特征的特定物种反应.
- 中等的牧场强度促进了最高的植物生产率和P度,为可持续的畜牧生产提供了基础.
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