5. CONCLUSION
Drought and heat stress generally inhibited the characteristic indexes of alpine meadow plants. The effect of a single factor on height and LWC was greater than that of multiple factors combined, and the photosynthetic indexes were more sensitive to multiple factors combined than a single factor. Additionally, the response of four alpine meadow plant species to SM was more sensitive than that to DT. Moreover, our results showed that the Pn and Tr of K. humilis and P. annua had similar response patterns to stress; the same was true for the response patterns of the same photosynthetic characteristics of O. ochrocephala andS. pulchra . Overall, K. humilis and P. annuaadapted to and resisted less the stress treatment than O. ochrocephala and S. pulchra . The findings of this study reveal the regularities and differences in the response patterns of different functional groups of plants to environmental stress in an alpine meadow. Additionally, our results provide a theoretical basis for the rational utilization of grassland resources in alpine meadows in the context of climate change.
ACKNOWLEDGMENTS
This work was supported by the National Natural Science Foundation of China (31672475), Natural Science Foundation of Qinghai Province (2019-ZJ-908), National Key Research and Development Program of China (2016YFC0501901), and the Second Comprehensive Scientific Investigation of the Tibetan Plateau (2019QZKK0302).
AUTHOR CONTRIBUTIONS
Formal analysis, Li Ma; data curation, Zhonghua Zhang; data curation Bingrong Zhou; software, Manhou Xu; writing-review and editing, Huakun Zhou. All authors have read and agreed to the published version of the manuscript.
CONFLICT OF INTEREST
The authors declare no conflict of interest
DATA ACCESSIBILITY STATEMENT
If the paper has a chance to be accepted, the authors will deposit their data in Dryad