Effects of different pruning intensity on leaf physiology and yield in Castanea henryi
In order to explore the reasonable pruning intensity of Castanea henryi, we used 7 yearsC. henryi'Huali No.3' as experimental materials to study the effects of different pruning intensities on leaf quality, min-eral element contents, photosynthesis and yield by light pruning (15% pruning), medium pruning (30% prun-ing), heavy pruning (45% pruning) and non-pruning (control) treatments. The results showed that different pruning intensity had different effects on the leaf quality of C. henryi canaliculata, and the mid-pruning had the best effect. In the upper canopy, the single leaf area was 72.92 cm2, which was 18.38% higher than the control. In the lower canopy, the SPAD valueswere 4.27%, 8.05% and 8.29% higher than those of the pruning, light pruning and control, respectively. The P, K and Ca contents in leaves, but the Ca content in medium pruning and heavy pruning was not significant, and Ca content in heavy pruned leaves was 35.56 mg·g-1. The net photosynthetic rate of the upper leaves was 12.85 μmol·m-2·s-1, the transpiration rate was 3.75 mmol·m-2·s-1 and the stomatal conductance was 0.18 mmol·m-2·s-1, which was the highest, increased by 20.3%, 12.3% and 20.0% respectively compared with the control. The intercellular CO2 concentration in the upper canopy decreased by 2.32% compared with the control. The photosynthetic parameters of C. henryi were significantly different, and the maximum photosynthetic rate, light saturation point and carboxylation efficiency were significantly higher than those of other treatments, while the light compensation point and dark respiration rate were significantly lower than those of other treatments. The yield of single plant was 10.25 kg, which was 9.58%, 10.96% and 21.61% higher than that of pruning and light pruning, respectively, while the weight of single cropping was 7.76 g. In conclusion, middle pruning could significantly improve leaf quality, photosynthetic capacity and yield of C. henryi than other treatments, and suitable pruning intensity for C. henryi fruit.
NETL
NSTL
万方数据
维普
