Photosynthetic performance of two poplar species in shelterbelt under water-saving irrigation in arid northwest China

摘要: Understanding the physiology of plants in arid regions under changed water availability is critical to projecting future ecosystems. A water-saving irrigation has been implemented an ecological shelter forest agricultural reclamation area located desert region northwestern Dzungaria Basin Xinjiang, China. In order understand effects on trees, two poplar species (Populus euphratica and P. russkii) growing shelterbelt were selected, their photosynthetic performance was contrasted by measuring gas exchange photochemical parameters traditional extensive flood irrigation. Results showed that reduced during had a moderate but not significant impact photosynthesis species. Populus russkii more sensitive than euphratica, latter relatively higher water-deficit resistance better exhibited capability non-photochemical quenching thermal dissipation excess excitation energy at both modes making it capable maintaining euphratica. Thermal increased photo-respiration rate together provided photo protection Both can maintain normal function photosystem The declined could be attributed inhibition. All this suggested manager feasible.