林业科学2011，Vol.47Issue(4)：107-113,7.
杨树农田防护林带单木叶面积的变化
Variation of Leaf Area in Individual Tree for Poplar Shelterbelts
摘要
Abstract
Leaf area (LA) as an essential part of crown structure affects both the growth of forests and protective effects of shelterbelt. The variation in specific leaf area (SLA) and leaf area with position in the crown was investigated for 5 -year-old and 7-year-old Populus × euramericana cv. “74/76” stand in Henan Eastern Plain. Allometric equations describing the leaf area of the entire crown were developed. The results showed that SLA on individual tree were 136. 6,138. 2 cm2 ·g-1 in 5-year-old and 7-year-old trees, respectively. However, leaf area on individual tree was significantly influenced by tree age, on average it were 45.4,85. 8 m2 in 5-year-old and 7-year-old trees, respectively. Specific leaf area and leaf area were significantly by the position in the crown. Specific leaf area increased significanfiy from the top to the bottom of the crown. Leaf area increased significanfiy from the top to the bottom of the crown for 5-year-old stand,however, it in the middle was significantly higher than that in the upper and the lower of the crown for 7-year-old stand,and both increased significantly from the interior to the exterior of the crown. There were different classes of shoots in different stand age, three classes of shoots in Populus × eurarnericana cv. “74/76” aged 5 years and four classes of shoots in it aged 7 years. Leaf area among several orders of shoots had both significantly difference for 5-year-old and 7-year-old stand. Allometric relationships of leaf area with different tree characteristics indicated that stem diameter at breast height (DBH), tree height (H) and crown length (CL) were reliable predictors of leaf area at the tree-level, however, the allometric relationships between DBH and leaf area at the tree-level were more reliable and convenient to predict the treelevel leaf area and to estimate leaf area index (LAI).关键词
叶面积/异速生长关系/冠层位置/防护林带/欧美杨107杨Key words
leaf area/ allometric relationship/ within-crown position/ shelterbelt/ Populus × euramericana cv. “ 74/76”分类
农业科技引用本文复制引用
赵东,杨喜田,樊巍,高喜荣,王齐瑞..杨树农田防护林带单木叶面积的变化[J].林业科学,2011,47(4):107-113,7.基金项目
国家"十一五"科技支撑项目"豫东平原农区农林复合系统可持续经营技术研究"(2006BAD03A0506) （2006BAD03A0506）
林业公益性行业科研专项"典型平原农区多目标农业防护林构建与可持续经营技术研究"(20070414)部分内容. （20070414）
