摘要
渭北果区正在推广的旨在提高果园通风透光条件的“大改形”技术已进行几年,为对其效果进行观察,应用WinsCanopy2004a冠层分析仪对陕西渭北3种不同类型苹果园冠层及光照的有关参数进行了测定。结果表明,3类果园的平均冠下总辐射偏大(透光率高),每666.7m2留枝量偏低,说明改形对改善树体的光照条件效果明显,但是改形偏重;中冠园果树的透光率最高,小冠园最低;大冠园果树的叶面积指数最大,当年生枝量与主枝数的比例最大。
The Modified Tree Form which having the advantage of improving the light distribution in the canopy has been popularized for years in Weibei highland area, Shaanxi province. In order to study the characteristics of light distribution in the three type orchards： small canopy, middle canopy and large canopy in Weibei highland area WinsCanopy2004a for Hemispherical Image Analysis Instruments were used. The results showed that the average PPFD under the canopy of all researched orchards was a little bit too high, which means that the number of branches per ha was not enough. In Weibei area the apple trees with middle canopy had the best light permeability, but the small canopy had the lowest light permeability. The leaf area index and the ratio of current branches ＆ limbs in large canopy were maximal. When using WinsCanopy2004a for apple tree canopy analysis, the LAI2000 methods should be selected.
出处
《果树学报》
CAS
CSCD
北大核心
2007年第3期259-262,共4页
Journal of Fruit Science
基金
农业部948项目(2003-Q07)。
关键词
苹果园
冠层
透光率
改形
枝量
Apple orchard
Canopy
Light permeability
Tree form modified
Quantity of branches
