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Photosynthetic characteristics of Phyllostachys edulis under different management modes

Forest management modes closely relate to the available light in a forest, its temperature, moisture, and nutrient status, which all influence photosynthesis. To investigate how photosynthetic characteristics respond to different management modes, we studied five bamboo forest types in Anhui Province, including one type extensively managed (I) scarce any human disturbance, one type moderately managed (II) some human cutting planless and three types intensively managed, which were amount of shoot dug 10%—15% (III), amount of shoot dug 15%—20% (IV) and amount of shoot dug less 10% with fertilizering every September (V). The results showed that 1) there was a significant difference between leaf area index (LAI) and soil and plant analyzer development ( SPAD). Moreover, the variability of LAI and SPAD values increased with increasing intensity of management. 2) The variation in light⁃response curves was similar under different management modes. In addition, a non⁃rectangular hyperbola was the best model for fitting the light⁃response curve data, with correlation coefficients greater than 0.96. Furthermore, with increasing photosynthetically active radiation (PAR), net photosynthetic rate ( Pn ), stomatal conductance ( Cd ), and transpiration rate ( Tr ) increased, but intercellular CO2 concentration (C i) decreased. Photosynthetic characteristics had higher values in forests under non⁃intensive management