Characteristic Parameters of Light Response of Photosynthesis of Main Tree Species for Vegetation Restoration in Dry Season in Dry-Hot River Valley
Characteristic parameters of photosynthesis in response to irradiance of 13 naturally-regenerated tree species, which were used for vegetation restoration in the dry-hot river valley of the Jinsha River, were studied and several main conclusions were drawn. It was theoretical and feasible to determine the weak light range by the descending point of light using efficiency on light response curve. The subsection functions provided a well-fitted simulating curve for photosynthetic response to irradiance. The determination of weak light region had significant effect on apparent quantum yield of photosynthesis (α) and dark respiration rate (R_d), however it had not obvious effect on light compensation point (LCP), light saturation point (LSP) and maximum apparent photosynthesis rate (P_(max)). The variation ranges of α, R_d LCP,LSP, P_(max) of 13 tree species in dry March respectively were 0.020 7～0.059 2 μmol CO_2·m~(-2)s~(-1)/μmolphotons·m~(-2)s~(-1), -2.07～-0.31μmol CO_2·m~(-2)s~(-1), 14～37 μmolphotons·m~(-2)s~(-1), 1 015～1 648 μmolphotons·m~(-2)s~(-1), 3.09～19.32 μmol CO_2·m~(-2)s~(-1). There were similar rank of the 13 species among the bases of the maximum apparent photosynthesis rate, the saturation light using efficiency and apparent quantum yield of photosynthesis, which suggested that if the tree species had a higher light using efficiency in weak light region and under the saturated light, they often had a higher maximum apparent photosynthesis rate.
dry-hot river valleyvegetation restorationlight response curve of photosynthesisapparent quantum yield of photosynthesissubsection function
国家科技期刊平台
NSTL
万方数据
维普
