Subjects: Biology >> Botany >> Applied botany submitted time 2021-04-29 Cooperative journals: 《广西植物》
Abstract： In this study, the functional traits of annual branchlets and leaves of Tsoongiodendron odorum, an endangered species, were sampled and measured along five different latitude gradients in Guangxi. The variation of biomass distribution and leaf functional traits along the latitude gradient were discussed. The results were as follows: (1) The total branchlet weight and total leaf weight tends to allometric growth relationship with the increase of latitude, and its biomass tends to the construction of branchlets. (2) The functional traits of the leaves showed the same pattern:increases with latitude from south to north, its leaf area, and leaf mass decreases with increasing latitude; leaf thickness, leaf dry matter content, stomatal length, stomatal area, stomatal density showed a trend of gradual increase; specific leaf area, leaf water content and stomatal width increase at first and then decrease, and overall showed a trend of gradual decrease, leaf tissue density decreases and then increases, indicated that T. odorum can respond to changes in the geographical environment through the plasticity of the leaf shape. (3) Specific leaf area was significantly positively correlated with leaf moisture content, but negatively correlated with leaf fresh weight, leaf dry matter content, and stomatal density. There was a significant negative correlation between leaf dry matter content and leaf water content, which means that T. odorum could respond to the change of geographical environment by adjusting and balancing the character combination of leaves. (4) CCA analysis shows that slope is the most significant variable affecting the functional traits of T. odorum, the mean annual temperature also has a significant impact on the functional traits of T. odorum, the mean annual precipitation, and relative humidity have a certain intensity effect on plant functional traits, but not significantly. The functional traits of T. odorum are mainly affected by environmental factors such as slope and mean annual temperature. The research results are helpful to understand the adaptation characteristics of T. odorum to the environment, and its response mechanism to latitude variation is of great significance.
Subjects: Biology >> Botany >> Applied botany submitted time 2020-08-02 Cooperative journals: 《广西植物》
Abstract：植物功能性状种间性状变异反映不同物种的生活史对策，种内变异反映了同一物种不同个体应对不同环境的性状应答。人工林均一的环境有利于深入分析不同树种种内和种间变异。本研究以南宁良凤江林场的四种乡土珍贵阔叶树种（观光木Tsoongiodendron odorum、红锥Castanopsis hystrix、灰木莲Magnolia blumei和望天树Parashorea chinensis）为研究对象，对其叶功能性状的种内和种间变异进行研究，结果表明：（1）同一高度的四种植物的大部分叶功能形状差异显著，只有极少数叶功能性状差异不显著。相较于其他三种植物，红锥的叶鲜重、叶厚度、叶面积、叶干重、比叶面积和叶含水率较小，但红锥的比叶重、叶干物质量和叶组织密度较大。（2）不同高度的叶功能性状存在差异，不同的树种差异表现不同。高度对叶功能性状的影响：灰木莲＞望天树＞观光木＞红锥。随着高度的变化，9种叶功能性状中，叶厚度和叶组织密度表现最稳定，叶面积和叶干重变化较大；比叶面积呈下降趋势，比叶重呈上升趋势。（3）随着树龄的增大，灰木莲的叶功能性状变化最大，红锥的叶功能性状表现最稳定，树龄对叶功能性状的影响：灰木莲＞观光木/望天树＞红锥。9种叶功能性状中，受到树龄影响最大的是叶厚度和叶组织密度，影响最小的是叶鲜重、叶干重和叶面积；四种树种的叶功能性状随树龄的变化差异显著，但不具有明显规律性。（4）叶干物质量与叶厚度相关性不显著，叶含水率与叶厚度、叶面积、叶干重和比叶重相关性不显著，其余各功能性状存在一定的相关性。
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