IMPROVED PERFORMANCE OF PHOTOSYNTHETIC LIGHT RESPONSE EQUATIONS WITH UNIFIED PARAMETERS FOR RICE LEAVES WITH DIFFERENT SPAD VALUES

摘要

Haloxylon ammodendron and H. persicum are important part of the desert ecosystems, particularly in shifting sand duneareas, and these plants are common in the Jungar Basin of the northwestern China. To obtain basic information for theconservation and reintroduction of these two species, we studied the impact of water supply and sowing depth on the seedlingemergence. Our results showed that proportion and rate of emergence increased with quantity of irrigation rate and sowingdepth initially and then it declined, leading to the seedling mortality. Seeds, which were sown for 0.5 cm or 1.0 cm depth andhaving 20 mm of water supply, resulted in the highest emergence percentage and rate, whereas surface sowing of 0 cm depthand 10 mm of water supply led to 100% of seedling mortality within 30 days. Based on these results and taking into accountthe pattern of precipitation in the Jungar Basin, sowing of H. ammodendron and H. persicum for 0.5–1.0 cm depth before thesnow cover begins melting in early spring is a critical point for the artificial restoration of these plants.