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不同地理种源杉木细根呼吸及其与形态、化学性状的关系研究

Fine Root Respiration and Its Relationship with Morphological and Chemical Traits of Cunninghamia lanceolata Provenances

    摘要
  • 摘要:
    目的 ：分析不同种源杉木细根呼吸及其形态、化学性状的差异，增进对根系呼吸与其他根系特征之间联系的理解。
    方法 ：以江西大岗山杉木种源同质园的10个种源为对象，对杉木细根呼吸及其形态、化学性状的种源间差异以及各指标间的关联性开展了研究。
    结果 ：杉木细根呼吸、细根形态性状和化学性状的种源间变异系数分别为40.42%、18.82%～22.88%、7.84%～19.73%。不同种源杉木细根呼吸存在显著差 异（p<0.05），浙江开化种源细根呼吸速率最大（7.97 ± 1.08 nmol·g−1·s−1），重庆永川种源最小（1.63 ± 0.40 nmol·g−1·s−1）；不同种源杉木细根形态性状、化学性状也呈显著差异（p<0.05），福建建瓯种源具有最大的比根长（579.17 ± 17.11 cm·g−1）、根比表面积（139.97 ± 10.18 cm2·g−1）；浙江开化种源具有最大的根C含量（458.12 ± 5.40 g·kg−1）、N含量（10.58 ± 0.02 g·kg−1）、N : P（17.85 ± 0.29）;江西分宜本地种源具有最大的根组织密度（0.62 ± 0.12 g·cm−3）、以及最小的根N含量（6.38 ± 0.11 g·kg−1）、C : P（481.39 ± 8.94）、N : P（10.64 ± 0.41）。对杉木细根呼吸及其形态、化学性状间的权衡关系分析表明，细根呼吸与根系氮含量之间呈显著正相关（p<0.05），与比根长、根组织密度的相关性较小。
    结论 ：不同地理种源杉木细根对环境变化的适应策略存在差异，细根呼吸与根形态性状的关联较小，主要与根N含量关系密切。

     

    Abstract:
    Objective : To analyze the difference of fine root respiration and its morphological and chemical characters among different provenances of Cunninghamia lanceolata for understanding the relationship between root respiration and other root characteristics.
    Methods: Based on the 10 provenances of Chinese fir (Cunninghamia lanceolata (Lamb.) Hook.) provenances homogenous garden in Dagangshan, Jiangxi Province, the variation between provenances of fine root respiration, morphology and chemical traits of Chinese fir and the correlation among different traits were studied.
    Results: The coefficient of variation of fine root respiration, fine root morphological traits and chemical traits among provenances of Chinese fir were 40.42%, 18.82%~22.88% and 7.84%~19.73%, respectively. There were significant differences in fine root respiration among provenances (p<0.05). The fine root respiration rate was the highest in Kaihua Zhejiang provenances (7.97 ± 1.08 nmol·g−1·s−1) and the lowest in Yongchuan provenances (1.63 ± 0.40 nmol·g−1·s−1 nmol·g−1·s−1). The morphological and chemical characters of fine roots of Chinese fir from different provenances were also significantly different (p<0.05). The provenances of Jian 'ou Fujian had the largest specific root length (579.17 ± 17.11 cm·g−1), root specific surface area (139.97 ± 10.18 cm2·g−1). The root C content (458.12 ± 5.40 g·kg−1) and N content (10.58 ± 0.02 g·kg−1) were the largest in Kaihua Zhejiang provenance; The local provenances of Fenyi Jiangxi Province had the largest root tissue density (0.62 ± 0.12 g·cm−3), and the lowest root N content (6.38 ± 0.11 g·kg−1), C:P (481.39 ± 8.94), N:P (10.64 ± 0.41). The trade-off analysis of fine root respiration, morphological and chemical traits of Chinese firprovenances showed that there was a significant correlation between fine root respiration and root nitrogen content (p<0.05), but insignificant correlation with specific root length and root tissue density.
    Conclusion : The adaptation strategies of fine roots of Chinese fir provenances to environmental changes are different. The correlation between fine root respiration and root morphological traits is little, and it is mainly related to root N content.

     

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