Scientific Research On Net Photosythesis Rate In Related With Climate Changes - Case From Western Heilongjiang Province

Studying the relation between net photosynthesis rate and some environmental factors such as photosynthesis active radiation, temperature, relative humidity and air CO2 concentration. The results show that there are close relationships between net photosynthesis rate and environmental factors. Upon this environmental factors, photosynthesis active radiation have high influence on the net photosynthesis rate. From the analysis between different water disposal and environmnental factors, the middle water level is superior to the high water level.