Effects of transplantation and potassium fertilizer on the photosynthetic characteristics and chlorophyll content of Dalbergia odorifera
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Abstract
Dalbergia odorifera T. Chen was used to analyze the effects of transplantation and potassium fertilizer on its photosynthetic characteristics and chlorophyll content. Results showed that the maximum net photosynthetic rate of plants after root pruning was 19.25%, 34.79%, 40.88%, and 219.86% higher than that of de-crowning, full-crown transplantation, CK, and de-crown transplantation. The maximum light saturation point(LSP) occurred under de-crowning treatment, and the maximum light compensation point(LCP) occurred under root pruning. The net photosynthetic rate(Pn) and transpiration rate(Tr) were highest under root pruning treatment. Compared with CK, the contents of Chla, Chlb, Chl(a + b), and Car were all higher under root pruning, de-crowning, and full-crown transplantation. Chla, Chlb, and Chl(a + b) all increased with the increase in potash fertilizer. The maximum net photosynthetic rate increased with the increase in potassium fertilizer dosage. The LSP value was largest under K2 treatment. As the amount of potash fertilizer increased, Pn and Cond showed a tendency to increase. The Chla/Chlb ratio under CK treatment was significantly higher than that under K1 and K2. Root pruning, de-crowning, and applying potash fertilizer significantly increased the chlorophyll content of D. odorifera, which was beneficial for photosynthesis and the promotion of plant growth.
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