6个优良杉木家系的生长、光合和氮磷养分利用效率差异  

Differences in Growth,Photosynthetic Capacity,N and P Use Efficiency among 6 Superior Cunninghamia lanceolata Families

作　　者：陈娜[1] 朱鹏[1] 陈良华[1] 胡红玲[1] 张健[1] 肖玖金[1] 杨汉波 CHEN Na;ZHU Peng;CHEN Lianghua;HU Hongling;ZHANG Jian;XIAO Jiujin;YANG Hanbo(Forestry Ecological Engineering in the Upper Reaches of the Yangtze River Key Laboratory of Sichuan Province,National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River,Rainy Area of West China Plantation Ecosystem Permanent Scientific Research Base,Institute of Ecology&Forestry,Sichuan Agricultural University,Chengdu 611130,China)

机构地区：[1]长江上游林业生态工程四川省重点实验室,长江上游森林资源保育与生态安全国家林业和草原局重点实验室,华西雨屏区人工林生态系统研究长期科研基地,四川农业大学生态林业研究所,成都611130

出　　处：《四川农业大学学报》2020年第4期449-456,共8页Journal of Sichuan Agricultural University

基　　金：四川省科技计划资助(2019YJ0416,2016NYZ0035-01,2019YJ0427)。

摘　　要：【目的】生长监测和光合生理机制研究可为杉木优良家系的早期选择和科学评价提供理论依据。【方法】从国家杉木工程中心引进62个第3代杉木半同胞家系建立子代测定林,以本地的1.5代杉木为对照(CK),以生长优于本地杉木的6个杉木家系为对象,研究它们的生长性状、光合特征及其与氮(N)、磷(P)利用效率的内在关系。【结果】3号家系的株高和地径最大,显著高于CK、26和42号家系(P<0.05);家系间的最大光合速率(Pmax)、表观量子效率(Q)、光呼吸速率(Rd)、光饱和点(LSP)和补偿点(LCP)的差异均不显著(P>0.05),但家系间叶绿素a、b及总叶绿素含量的差异显著,26号家系最高,3号家系最低;家系间N、P养分含量及其光合利用效率的差异不显著。相关分析表明,生长性状与Pmax、Q、叶N含量呈显著负相关;具有较高LSP和较低Rd的家系,生长表现更好。N、P化学计量比特征表明幼龄期杉木的生长主要受N的限制,生长较差的家系采取保守的N、P利用策略。【结论】杉木生长性状不仅与净光合速率有关,更与光合总叶面积紧密相关,生长更好的家系对N、P养分需求量更大。综合来看,3、23和43号家系最为优良,可进一步从中筛选优良单株。【Objective】Growth monitoring and studying in photosynthetic physiology of Cunninghamia lanceolata families can provide theoretical basis for early selection and scientific evaluation of superior C.lanceolata families.【Method】We introduced a total of 62 third-generation C.lanceolata families from the National C.lanceolata Engineering Center and built a half-sib progeny testing plantation in Sichuan Province,using a local 1.5-generation C.lanceolata family as the control(CK).In our study,six of C.lanceolata families that grew better than CK were selected as materials to detect their differences in growth,photosynthetic capacity,nitrogen(N)and(P)phosphorus content and their use efficiency.【Result】No.3 family showed the maximum height and basal diameter,which were significantly higher than those of CK,No.26 and 42 family.There was no significant difference in light-saturated photosynthetic rate(Pmax),apparent quantum efficiency(Q),dark respiration rate(Rd),light saturated point(LSP),and light compensation point(LCP)among all families.However,differences in content of chlorophyll a(Chl a),b(Chl b)and total amount of chlorophyll(TC)were significant among the families.The maximum chlorophyll amount(Chl a,,Chl b and TC)was found in leaves of No.26 family,but the minimum chlorophyll amount(Chl a,Chl b and TC)was detected in leaves of No.3 family.There was no significant difference in N,P content and their use efficiency among the families.Correlation analysis indicated that height of C.lanceolata families was negatively related with Pmax,Q and leaf N content.The families with higher LSP but lower Rd showed better growth conditions.The stoichiometric ratio of N to P indicated that growth of C.lanceolata was mainly limited by N at the early stage,and families with relatively slower growth rate may adopt conservative N and P use strategies.【Conclusion】These results suggested that growth of C.lanceolata is not only related to photosynthetic rate,but also closely to total photosynthetic area of tree crown.In co

关 键 词：杉木 优良家系 光合性状 化学计量特征 氮磷利用效率 

分 类 号：S722.5[农业科学—林木遗传育种] S791.27[农业科学—林学]