Short-term Effects of Pruning on the Growth and Nutrients of Marshland Poplar
In this paper the Yangtze River marshland poplar plantations in Huaining County of Anhui Province were selected as the study objects. The＇ nutrient contents in the poplar and soil before and after pruning were studied. The results showed： （1） Pruning of a certain intensity had significant effects on the height and DBH growth of poplar（p〈0.05）. The height growth increased first and then decreased, but the DBH growth increased all the time as the pruning intensity increased. （2） Pruning would reduce the total nitrogen contents in the soil, but didn＇t had significant effects on the total nitrogen, total phosphorus, available phosphorus and potassium contents （p〉0.05）. （3）Pruning didn＇t had significant effects on the nutrients of different soil depths （p 〉0.05）, but the total nitrogen, total phosphorus and available phosphorus contents decreased gradually with soil depth, while the potassium, calcium and magnesium contents were basically the same. At the same pruning intensity, the various nutrient contents in different directions were basically the same with the exception of the calcium content which reached a maximum in every direction with light pruning. （4）The total nitrogen content of roots was the highest among all the organs. At the three pruning intensities, the total nitrogen content of the branches reduced with age and that of the roots increased. Pruning had significant effects on the total nitrogen content of the upper branches （p〈0.05）. The pruning intensity had significant effects on the total nitrogen content of the medium branches and roots with diameter exceeding 5 mm（p〈0.05）. Pruning didn＇t had significant effects on the total phosphorus content of various poplar organs（p〉0.05）. Except that the calcium contents in medium branches had significant differences between the light and intensive pruning（p〈0.05）, pruning didn＇t had significant effects on the plant potassium, calcium and magnesium contents （p〉0.05）, but they tended to decrease with the growth of branches while having no significant changes with the growth of roots.
NETL
NSTL
万方数据
维普
