Effects of Shading on Growth and Physiological Characteristics of <i>Alnus formosana</i> Seedlings

YAO Ping; SHI Xin-sheng; TAO Jian-jun

doi:10.16779/j.cnki.1003-5508.2013.03.015

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Volume 34 Issue 3

Nov. 2019

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Article Navigation > Journal of Sichuan Forestry Science and Technology > 2013 > 34(3): 69-74

YAO Ping, SHI Xin-sheng, TAO Jian-jun. Effects of Shading on Growth and Physiological Characteristics of Alnus formosana Seedlings[J]. Journal of Sichuan Forestry Science and Technology, 2013, 34(3): 69-74. doi: 10.16779/j.cnki.1003-5508.2013.03.015

Citation:

YAO Ping, SHI Xin-sheng, TAO Jian-jun. Effects of Shading on Growth and Physiological Characteristics of Alnus formosana Seedlings[J]. Journal of Sichuan Forestry Science and Technology, 2013, 34(3): 69-74. doi: 10.16779/j.cnki.1003-5508.2013.03.015

Effects of Shading on Growth and Physiological Characteristics of Alnus formosana Seedlings

doi: 10.16779/j.cnki.1003-5508.2013.03.015

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Heishui County Forestry Bureau of Aba Tibetan and Qiang Autonomous Prefecture, Heishui 623500, Sichuan, China;Chuanxi Forestry Bureau of Aba Tibetan and Qiang Autonomous Prefecture, Lixian 623102, Sichuan, China;Urban and Rural Development College of Sichuan Agricultural University, Dujiangyan 611800, Sichuan, China

Received Date: 2013-01-28

Abstract

In order to understand the effects of shading on the growth of Alnus formosana,100%,50% and 15% of transmittance were simulated according to the light regimes in the forest opening,forest gap and forest canopy. Studies were made of the growth and physiological characteristics of A. formosana seedlings planted in different shading treatments. The results showed that with shading intensity increasing,plant height and base diameter showed the trend of first increasing and then decreasing,while net photosynthetic rate(Pn),transpiration rate(Tr) and stomatal conductance(Gs) gradually reduced except for intercellular CO₂ concentration(Ci). Under different shading conditions,chlorophyll a(Chla),chlorophyll b(Chlb) and total chlorophyll content increased with transmittance decreasing,however,carotenoids(Car) content,chlorophyll a/b(Chla/b) and lamina mass per unit area(LMA) were opposite. In addition,with the reduction of light intensity,soluble sugar exhibited first decreasing and then increasing,while proline(pro) content gradually increased in leaves of A. formosana seedlings. Therefore, it was suggested that A. formosana seedlings could not adapt to the high-light environments outside forest,but moderate shading,that is to say,canopy gaps would benefit the seedling growth. At the same time,it also provided a scientific reference for forestation,breeding and vegetation recovery.
- A. formosana;
- Shading;
- Growth;
- Physiological;
- Photosynthesis;
- Osmoregulation
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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Proportional views

Effects of Shading on Growth and Physiological Characteristics of Alnus formosana Seedlings

doi: 10.16779/j.cnki.1003-5508.2013.03.015

Heishui County Forestry Bureau of Aba Tibetan and Qiang Autonomous Prefecture, Heishui 623500, Sichuan, China;Chuanxi Forestry Bureau of Aba Tibetan and Qiang Autonomous Prefecture, Lixian 623102, Sichuan, China;Urban and Rural Development College of Sichuan Agricultural University, Dujiangyan 611800, Sichuan, China

Received Date: 2013-01-28

Key words:

Abstract: In order to understand the effects of shading on the growth of Alnus formosana,100%,50% and 15% of transmittance were simulated according to the light regimes in the forest opening,forest gap and forest canopy. Studies were made of the growth and physiological characteristics of A. formosana seedlings planted in different shading treatments. The results showed that with shading intensity increasing,plant height and base diameter showed the trend of first increasing and then decreasing,while net photosynthetic rate(Pn),transpiration rate(Tr) and stomatal conductance(Gs) gradually reduced except for intercellular CO₂ concentration(Ci). Under different shading conditions,chlorophyll a(Chla),chlorophyll b(Chlb) and total chlorophyll content increased with transmittance decreasing,however,carotenoids(Car) content,chlorophyll a/b(Chla/b) and lamina mass per unit area(LMA) were opposite. In addition,with the reduction of light intensity,soluble sugar exhibited first decreasing and then increasing,while proline(pro) content gradually increased in leaves of A. formosana seedlings. Therefore, it was suggested that A. formosana seedlings could not adapt to the high-light environments outside forest,but moderate shading,that is to say,canopy gaps would benefit the seedling growth. At the same time,it also provided a scientific reference for forestation,breeding and vegetation recovery.