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遮荫处理对不同苗龄交让木的生长和光合特性的影响
李晓征;郝日明;任燕;
1.广西交通职业技术学院土木工程系;2.南京农业大学园艺学院 江苏南京210095;3.南京农业大学园艺学院;4.广西南宁530023;5.江苏南京210095
摘要:
运用生理生态研究方法,选取不同苗龄(二年生和五年生)的交让木的幼苗,对其光合色素、光合特性和株高增量等指标进行测试分析。结果表明,遮荫后二年生和五年生交让木的叶绿素和类乎萝卜素含量上升,Chl.a/Chl.b下降,光饱和点和补偿点下降。和对照的全光照条件相比,二年生交让木在遮荫处理下株高增量较大,最大净光合速率较高,光合优势明显;而五年生交让木表现相反趋势。揭示了不同苗龄交让木的生长及光合特性,为其科学栽培管理措施的制定提供了理论依据。
关键词:  遮荫处理    光合特性    交让木
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Fund project:国家林业局“948”项目(2001-59-01)~~
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