摘要
用量子传感器对桃、梨和苹果树冠层的透光率作了测量。两年的观测结果表明 :晴天树冠透光率 τ的日变化曲线呈 U字形 ,日平均透光率 τd 与树种和树龄的关系不大。在正常年份 ,展叶后符合关系式τd=7.85 N-0 .88,N为从 4月 1日起算的天数。而物候期变化对τd 的影响 。
Light (0.4～0.7μm) Penetration through individual peach, pear and apple tree crowns was measured with quantum sensors. Results from the 2-year experiment showed that for all the 3 fruit tree species and for normal years light penetration,τ d, can be expressed with an empirical formula, τ d= 7.85N -0.88, where N is the days counted from April 1. Varieties and ages of the trees have little impact on τ d. The effect of phenological stages on τ d can be removed by simply adjusting the formula according to phenological stages.
出处
《中国农业气象》
CSCD
北大核心
1996年第6期1-4,11,共5页
Chinese Journal of Agrometeorology
基金
国家自然科学基金资助
关键词
光热资源利用
果树冠层透光率
农林复合经营
Ecosystems of crops and fruit trees
Use of resources of light and temperature
Light penetration through crowns
