在部分根区干燥下草光合作用:日间模式及其非口腔局限性
Yadong Wang1, Qiuchi Zhang1, Mingxiu Ju1
1College of Grassland Science, Inner Mongolia Minzu University, Tongliao 028000, China.
Plants (Basel, Switzerland)
|June 13, 2025
概括
部分根区干燥 (PRD) 缺水会通过口腔和非口腔的限制来降低的光合作用. 过度灌可以增强光合作用和产量,提高水的生产力.
科学领域:
- 植物生理学 植物生理学
- 农业科学 农业科学
- 环境科学 环境科学
背景情况:
- 在部分根区干燥 (PRD) 下影响植物光合作用的胃因子得到了充分研究.
- 非口腔因素和光合作用和PRD下的土壤水分之间的直接关系仍然未被充分探索.
研究的目的:
- 评估不同灌水平 (过度灌,充分灌,中度缺水,严重缺水) 对在PRD下白叶光合作用日间变化的影响.
- 研究在不同土壤湿度条件下光合作用中口腔和非口腔限制的作用.
- 为了确定土壤水分和的关键光合作用参数之间的关系.
主要方法:
- 对草进行了四次灌处理.
- 测量了光合作用率 (Pn),口腔导电率 (Gs),细胞间CO2度 (Ci) 和透气率 (Tr) 的日间变化.
- 在10厘米和20厘米深处的土壤含水量和光合作用参数之间进行了相关性分析.
主要成果:
- 所有缺水水平都降低了叶的光合作用率 (Pn),中度和严重的缺水导致中午的"光合作用午餐休息".
- 在上午11:30之前,口腔限制主导了Pn的减少,而此后非口腔限制成为主导因素.
- 过度灌增加了Pn和透气率 (Tr),增加了33.1%的干草产量,并提高了水的生产力. 在PRD下的温和水资源赤字使得产量减少了18.6%.
结论:
- 门口和非门口机制都会导致PRD缺水条件下草光合作用减少.
- 土壤的湿度,特别是在浅水深 (10厘米),显著影响光合作用性能.
- 过度灌有利于保持高的光合作用率,提高的产量和水的生产力.
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