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Differential Responses of Age-related Leaf Photosynthetic Characteristics of Pinus armandii and Pinus tabuliformis to Gap-model Thinning
Authors
包维楷
赵庆霞
Publication date
1 January 2018
Publisher
Doi
Cite
Abstract
[目的]通过对比研究华山松和油松不同叶龄针叶形态、光合速率、叶绿素和叶氮含量对林窗式疏伐的响应,探讨林窗大小、叶龄和树种对林窗式疏伐后叶光合特性响应的影响.[方法]2008年在30年生华山松和油松混交人工林中,设置对照、小林窗( 80 m~2 )和中林窗( 110 m~2 )处理, 2013年以对照样地内和林窗边缘华山松和油松为研究对象,测定其当年生、1年生和2年生叶比叶重( LMA) 、单位叶面积叶绿素a( Chl a) 、叶绿素b含量( Chl b) 、氮含量( N) 、最大净光合速率( Amax) 、光合氮利用效率( PNUE)等指标.[结果]小林窗和中林窗疏伐对叶光合特性影响一致,均对当年生叶影响不显著,但显著改变了1年生和2年生叶绿素含量、N和PNUE,提高了其Amax.华山松叶LMA、叶绿素含量、N、Amax均低于油松,两树种多年生叶对林窗式疏伐的响应也明显不同:林窗边缘华山松1年生和2年生叶LMA和N与对照差异不显著,但叶绿素含量低于对照,PNUE和Amax显著高于对照;林窗边缘油松1年生和2年生叶LMA和PNUE与对照差异不显著,但N和Amax显著高于对照.[结论]80 110 m~2林窗疏伐显著改变叶光合特性,提高其光合潜力;林窗疏伐影响1年生和2年生叶光合特性,对当年生叶影响不显著;华山松和油松对林窗式疏伐的响应特征存在差异
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Last time updated on 28/10/2019