修枝对滩地杨树生长和养分的短期影响  

Short-term Effects of Pruning on the Growth and Nutrients of Marshland Poplar

作　　者：刘西军[1] 黄庆丰[1] 徐小牛[1] 李文娟[1] 

机构地区：[1]安徽农业大学林学与园林学院,合肥230036

出　　处：《安徽林业科技》2012年第2期34-39,共6页Anhui Forestry Science and Technology

基　　金：国家"十一五"科技攻关项目(2006BAD03A1505)

摘　　要：以怀宁县皖河滩地杨树林为研究对象,对修枝前后林木与土壤中的养分含量进行了研究。结果表明:(1)一定修枝强度下,修枝对杨树的树高和胸径生长影响显著(P<0.05),但随着修枝强度增大对树高生长的影响是先增大后减小,而对胸径的影响是一直增大。(2)修枝会降低林地土壤全氮含量,但对土壤全氮、全磷、速效磷和钾含量影响不显著(P>0.05)。(3)修枝对不同土层深度土壤养分影响不显著(P>0.05),但全氮、全磷、速效磷含量均随着土层深度的加深而逐渐减少,钾、钙、镁含量基本相同;同一修枝强度下,各种养分含量在不同方向基本持平,只有钙的含量在每个方向都是以轻度修枝最大。(4)植物各器官中,全氮含量以根最高,3种修枝强度下,随着年龄增大枝的全氮含量降低,根的全氮含量增加。同时,修枝对上部枝的全氮含量影响显著(P<0.05);修枝强度对中部枝和大于5mm根的全氮含量影响显著(P<0.05);修枝对植物各组分全磷含量影响不显著(P>0.05);除中部枝的钙含量在轻度修剪与强度修剪有显著差异外(P<0.05),修枝对植物钾、钙、镁的影响不显著(P>0.05),但随着枝的生长钾、钙、镁的含量有降低的趋势;随着根的生长,钾、钙、镁的含量变化规律不明显。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 t

关 键 词：修枝 滩地 杨树 养分 

分 类 号：S792.11[农业科学—林木遗传育种]