不同地理种源杉木根叶功能性状与碳氮磷化学计量分析
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国家自然科学基金项目(31971674)


Analysis of Root and leaf functional traits and C,N,P stoichiometry of Cunninghamia lanceolate from different provenances
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    摘要:

    为认识地理环境因子对不同种源杉木的影响及其响应和适应特征,对生长在同质园的7个种源3年生杉木王幼树根、叶功能性状及碳氮磷化学计量与环境因子的关系进行了研究。结果表明:不同地理种源杉木功能性状种源间变异系数为7.3%-18.9%,化学计量种源间变异系数为1.6%-18.9%,均小于20%,叶、根C含量变异系数较小,说明C是植物体最稳定的元素。不同地理种源杉木幼树叶厚、比叶面积、叶组织密度、比叶重、叶干物质含量差异显著,表明杉木叶片形态具有较强的可塑性来适应不同种源地地理环境变化。不同地理种源杉木根N含量、根C∶N和根C∶P差异极显著,反映不同种源地气候与土壤养分对根系化学计量特征的潜在影响。江西文公山种源的杉木比叶面积最大,比根长、根干物质含量最小;安徽休宁种源的杉木叶片C含量、C∶P、根C∶N、N∶P最小,细根N、P含量最高;江西安福山种源的杉木细根C∶N最大,叶片N∶P、细根C、N、P含量、C∶N、C∶P最小。不同种源地经度与杉木叶组织密度、叶C∶P呈极显著正相关。随着降水梯度升高,不同种源杉木叶根N∶P、比叶面积、比叶重升高。随海拔升高和气温的降低,叶片厚度增加,叶组织密度密度减小,叶干物质含量减小,比叶面积减小。对不同地理种源杉木功能性状间的权衡关系分析表明,不同种源杉木根比表面积与比叶面积呈显著负相关且与比叶重呈极显著正相关,叶片及细根N含量与P含量均呈极显著正相关,说明杉木叶、根面积存在关联性,根长与根面积生长趋势相同,根叶对N、P元素含量的响应也相同。

    Abstract:

    The relationship between leaf and root functional traits, carbon (C), nitrogen (N) and phosphorus (P) stoichiometry and environmental factors of 3-year-old ancient Chinese fir seedlings collected from 7 different geographical provenances and sown in a homogenous orchard was analyzed to reveal the influence of geographical environment factors on different provenances of the Chinese fir and their response and adaptation characteristics. The results showed that the coefficient of variation of functional traits was 7.3% to 18.9%, and the coefficient of variation of stoichiometry provenances was 1.6% to 18.9%. The coefficient of variation of C content in leaves and roots were relatively small, indicating that C is the most stable element in the Chinese fir. There were significant differences in leaf thickness, specific leaf area, leaf tissue density, specific leaf weight, and leaf dry matter content of Chinese fir from different geographical provenances, indicating that Chinese fir leaf morphology had strong plasticity to adapt to the geographical environment variety of different provenances. The differences in root N content, root C ∶ N and root C ∶ P were extremely significant, reflecting the potential effects of climate and soil nutrients of different provenances on root stoichiometry. The provenance of Wengongshan Mountain in Jiangxi Province had the largest specific leaf area, but the specific root length and root dry matter content was the smallest. The contents of C and C ∶ P in leaves and the C ∶ N and N ∶ P in roots of the Chinese fir from Xiuning, Anhui provenance were the smallest, and the contents of N and P in fine roots was the highest. The C ∶ N of the fine roots from Anfushan, Jiangxi provenance was the largest, while the content of N ∶ P in leaves, and the contents of C, N, P, C ∶ N and C ∶ P in fine roots were the smallest. The longitude of the different geographical provenance was significantly positively correlated with the leaf tissue density and leaf C ∶ P. Following the precipitation gradient increases, the N ∶ P of leaf root, specific leaf area, and leaf mass per area increased. With altitude increasing and temperature decreasing, leaf thickness increased, leaf tissue density decreased, leaf dry matter content decreased, and specific leaf area decreased. The analysis of the trade-off relationship between the functional traits of the Chinese fir from different provenances shows that the root specific surface area of different provenances is significantly negatively correlated with the specific leaf area, and extremely significantly positively correlated with the specific leaf weight. The N and P concentrations of leaf and root are extremely significant positive correlation, so there is a correlation between the leaf area and root area of Chinese fir, the growth of root length and root area have the same trend, and the corresponding N and P element contents of roots and leaves are also the same.

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徐睿,刘静,王利艳,颜耀,马祥庆,李明.不同地理种源杉木根叶功能性状与碳氮磷化学计量分析.生态学报,2022,42(15):6298~6310

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