Research on limiting factors of photosynthesis in Coptis chinensis leaves under short-term drought An analytical method on limiting factors of urban ecological supporting system and its application to Guangzhou City A study on successional trends of plant communities within aerial seeding region of the Alxa Desert A Study of Rangeland Productive Potential and Limiting Factors in Inner Mongolia Autonomous Region A review on the functions of nitrogen-fixers in terrestrial ecosystems Research on limiting factors of photosynthesis in Coptis chinensis leaves under short-term drought