Leaf gas exchange and photosynthesis curves of Elymus nutans and Potentilla anserina under fencing and grazing conditions in the Qilian Mountains, Northwest China
| Autor: | Zhanlei Rong, Yahua Mao, Xiaoping Wang, Junjie Liu, Chuanyan Zhao, Guangde Zhang, Yunfei Gao, Zhaoxia Guo, Lijuan Ge, Wenbin Wang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
geography
Stomatal conductance geography.geographical_feature_category 010504 meteorology & atmospheric sciences 04 agricultural and veterinary sciences Management Monitoring Policy and Law Photosynthesis 01 natural sciences Grassland Plant ecology Agronomy Compensation point Grazing 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Environmental science Respiration rate 0105 earth and related environmental sciences Earth-Surface Processes Water Science and Technology Transpiration |
| Zdroj: | Journal of Arid Land. 11:431-445 |
| ISSN: | 2194-7783 1674-6767 |
| DOI: | 10.1007/s40333-019-0009-6 |
| Popis: | Potentilla anserina L. and Elymus nutans Griseb. are dominant species in the subalpine meadows of China. Grazing is one of the most important factors that influence community structure and productivity of subalpine meadows. Understanding how grazing changes photosynthetic capability is essential for preservation and restoration of grasslands. However, information about the effects of grazing on photosynthetic capability remains inadequate. Experiments were conducted in fencing and grazing areas in the Qilian Mountains, Northwest China. The leaf gas exchange and photosynthetic curves of P. anserina and E. nutans were measured at different growth stages. Results showed that grazing decreased the values of leaf gas exchange parameters, such as net photosynthetic rate, stomatal conductance, transpiration rate, and intercellular CO2 concentration of P. anserina and E. nutans. In addition, grazing decreased the values of net photosynthetic rate-photosynthetically active radiation (PN-PAR) curve parameters, such as light-saturated net photosynthetic rate, apparent quantum efficiency, light compensation point, light saturation point, and dark respiration rate. Our results demonstrated that grazing was the primary limiting factor for photosynthesis of dominant grassland species in the study area. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink