2013天目山野外生物学实习小论文 牛膝叶倾角与乔木盖度关系的研究 曹旖宁”严冰·姚睿捷·张博伦 (复旦大学生命科学学院,上海200433) 摘要:叶倾角是农作物的重要参数之一,它影响作物的光合作用,从而影响产量。在非农作物中,叶倾角对其生 长也有重要影响。植物具有自适性,会根据其对光通量的需求自主调节叶倾角,从而达到最有利于自身生长的状 态。牛膝上方乔木影响牛膝接受的光照强度,从而影响其叶倾角。我们试图证明乔木盖度与牛膝叶倾角余弦值之 的线性关系。 关键词:光合作用,光照强度,自适性 Relationship between leaf angle of Achyranthes bidentata and coverage of trees above Yining Cao, Bing Yan, Ruijie Yao, Bolun Zhang School of Life Sciences, Fudan University, Shanghai 200433 Abstract: It is well-known that leaf angle, as an important parameter of crop, has a great influence on production through the process of photosynthesis. In a similar way, the leaf angle of non-crop is essential to its growth as well, which has much less attention. As we all know, plants are self-adjustable and self-adaptable. They tend to make the most of energy in light, by changing its leaf angle, which leads to the best condition in growth. We picked up Achyranthes bidentata in Western Tianmu Mountain, an ideal subject for measurement of leaf angle. Illumination intensity, which was quantified as coverage of trees above, was considered to be the main factor of leaf angle. We tried to figure out the relationship between leaf angle and coverage of trees above, which was something linear in hypothesis, in order to understand the influence illumination has on leaf angle and the way plants adapt to the environment Key words: photosynthesis, illumination intensity, self-adaptable 牛膝( Achyranthes bidentata),为苋科牛膝属多年生草本植物,茎分枝对生。其主要生于山坡林 下,海拔200-1750米处,并于除东北外的全国各处均有分布。牛膝作为一种极为常见的植物品种,广 泛分布在本次野外实习考察的各个区域中。在具体观察过程中,我们发现,每株牛膝,其叶片的表现 形态各有不同,集中表现在叶片倾斜角度(即叶倾角)的不同。同时,我们也发现,牛膝的生长高度 导致它必定受到来自于上层高大乔木的遮蔽影响(即盖度)。而这将改变每一株个体接收的光照强度 那么也自然会影响到最终的生长结果。 针对具体农作物的研究已经表明,叶倾角可以较好的反映出植株个体所受光照强度,并且这两者 存在着联系,且针对每一种特定作物品种,其叶倾角与光照的关系并不相同。在这里,我们利用了传 统的测量方法,并结合了重力感应设备及计算机图像处理程序,希望找出牛膝叶倾角同其所处区域高 大乔木盖度的直接关系,并解释造成这一关系的原因。2013 天目山野外生物学实习小论文 牛膝叶倾角与乔木盖度关系的研究 曹旖宁* 严冰* 姚睿捷* 张博伦* （复旦大学生命科学学院，上海 200433） 摘要：叶倾角是农作物的重要参数之一，它影响作物的光合作用，从而影响产量。在非农作物中，叶倾角对其生 长也有重要影响。植物具有自适性，会根据其对光通量的需求自主调节叶倾角，从而达到最有利于自身生长的状 态。牛膝上方乔木影响牛膝接受的光照强度，从而影响其叶倾角。我们试图证明乔木盖度与牛膝叶倾角余弦值之 间的线性关系。 关键词：光合作用，光照强度，自适性 Relationship between leaf angle of Achyranthes bidentata and coverage of trees above Yining Cao*， Bing Yan*， Ruijie Yao*， Bolun Zhang* School of Life Sciences, Fudan University, Shanghai 200433 Abstract：It is well-known that leaf angle, as an important parameter of crop, has a great influence on production through the process of photosynthesis. In a similar way, the leaf angle of non-crop is essential to its growth as well, which has much less attention. As we all know, plants are self-adjustable and self-adaptable. They tend to make the most of energy in light, by changing its leaf angle, which leads to the best condition in growth. We picked up Achyranthes bidentata in Western Tianmu Mountain, an ideal subject for measurement of leaf angle. Illumination intensity, which was quantified as coverage of trees above, was considered to be the main factor of leaf angle. We tried to figure out the relationship between leaf angle and coverage of trees above, which was something linear in hypothesis, in order to understand the influence illumination has on leaf angle and the way plants adapt to the environment. Key words：photosynthesis, illumination intensity, self-adaptable 牛膝（Achyranthes bidentata），为苋科牛膝属多年生草本植物，茎分枝对生。其主要生于山坡林 下，海拔 200-1750 米处，并于除东北外的全国各处均有分布。牛膝作为一种极为常见的植物品种，广 泛分布在本次野外实习考察的各个区域中。在具体观察过程中，我们发现，每株牛膝，其叶片的表现 形态各有不同，集中表现在叶片倾斜角度（即叶倾角）的不同。同时，我们也发现，牛膝的生长高度， 导致它必定受到来自于上层高大乔木的遮蔽影响（即盖度）。而这将改变每一株个体接收的光照强度， 那么也自然会影响到最终的生长结果。 针对具体农作物的研究已经表明，叶倾角可以较好的反映出植株个体所受光照强度，并且这两者 存在着联系，且针对每一种特定作物品种，其叶倾角与光照的关系并不相同。在这里，我们利用了传 统的测量方法，并结合了重力感应设备及计算机图像处理程序，希望找出牛膝叶倾角同其所处区域高 大乔木盖度的直接关系，并解释造成这一关系的原因