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赵连春,赵成章,陈静,王继伟,李群.秦王川湿地不同密度柽柳枝-叶性状及其光合特性.生态学报,2018,(5).http://dx.doi.org/10.5846/stxb201702230296  
秦王川湿地不同密度柽柳枝-叶性状及其光合特性
Photosynthetic characteristics and twig-leaf traits of different densities of Tamarix gansuensis in Qinwangchuan wetland
投稿时间:2017-02-23  修订日期:2017-10-19
DOI: 10.5846/stxb201702230296
关键词功能性状  光合特性  秦王川湿地  不同密度  资源利用
Key Wordsfunctional traits  photosynthetic characteristics  Qinwangchuan wetland  different density  resource utilization
基金项目国家自然科学基金(41461013和91125014)
作者单位E-mail
赵连春 西北师范大学地理与环境科学学院 zhaolianchun@126.com 
赵成章 西北师范大学地理与环境科学学院 zhaocz601@163.com 
陈静 西北师范大学地理与环境科学学院  
王继伟 西北师范大学地理与环境科学学院  
李群 西北师范大学地理与环境科学学院  
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摘要:
枝、叶是植物的两个重要功能器官,密度制约下其生长关系不仅是植物个体发育过程的表现,也是植物与环境互相作用的结果,对于理解竞争条件下植物的资源利用策略具有重要意义。在兰州市秦王川国家湿地公园保育区,将柽柳(Tamarix ramosissma)种群分为Ⅰ(0.1-0.35棵﹒m-2)、Ⅱ(0.35-0.6棵﹒m-2)和Ⅲ(0.6-0.85棵﹒m-2)3个密度梯度,应用标准化主轴估计(standardized major axis estimation, SMA)法,研究了不同密度下,柽柳枝长度与叶面积、叶数量的生长关系及叶片光合特性。结果表明:随着柽柳种群密度的增加,群落土壤含水量逐渐增加,土壤容重、PH值和电导率逐渐减小;柽柳平均高度、郁闭度、枝长度和叶面积呈逐渐增大趋势,冠幅、基径、分枝角度、叶数量和光合有效辐射呈逐渐减小趋势;叶面积指数、净光合速率、蒸腾速率和气孔导度先增加后减小。枝长度与叶面积、叶数量在不同的密度梯度下显著正相关(P < 0.05),随着密度梯度的增加,枝长度与叶面积的回归斜率逐渐减小(P < 0.05),枝长度和叶数量回归斜率不变(P < 0.01),截距沿着y轴显著的正向移动。柽柳种群低密度下倾向于较小枝长度、叶面积和较大分枝角度、叶数量的枝叶构建模式并降低气孔导度、光合速率和蒸腾速率、提高水分利用效率,高密度下则选择较大枝长度、叶面积和较小分枝角度和叶数量的垂直空间拓展模式,并显著提高气孔导度、光合速率和蒸腾速率、降低水分利用效率,反映了密度制约下湿地植物的表型可塑适应机制和资源利用策略。
Abstract:
Twig and leaf of plant are the two most important functional organs, and their allometric relationship under the restriction of density is not only the expression of individual development, but also the result of interplay between the plant and the surroundings, which plays an important role in understanding the resource utilization strategies of plant. The Tamarix ramosissma communities were divided into three density gradients in Qinwangchuan national wetland park of Lanzhou, such as high density(0.1-0.35 trees?m-2), medium density(0.35-0.6 trees?m-2) and low density(0.6-0.85trees?m-2). We studied the relationship between the twig and the leaf growth by the method of standardized major axis estimation, and learned the photosynthetic characteristics of the leaves. Results showed that, with the increase of the density, the soil moisture increased, the soil bulk density, PH value, electric conductivity decreased, the plant height, canopy closure, twig length, leaf area increased, the crown width, branch diameter, bifurcation angle, leaf number, photosynthetically active radiation decreased, the leaf area index, net photosynthetic rate, transpiration rate, stomatal conductance increased then decreased. There was a significantly negative correlation (P < 0.05) between the twig and the leaf. With the increasing of the density, the regressive slope between the twig length and the leaf number was the same, but the intercept of it made positive shift along y axis, the regressive slope between the twig length and the leaf area decreased, which showed that there was an allometric relationship between the twig and the leaf. All these means that the Tamarix ramosissma was inclined to use the twig-leaf constructive mode of shorter twig length, less leaf area, bigger bifurcation angle, more leaf number in the low density, under such circumstances it decreased stomatal conductance, net photosynthetic rate, transpiration rate, and increased the water use efficiency. On the other hand, it used the expansion mode of longer twig length, larger leaf area, less bifurcation angle and leaf number in the high density, it increased stomatal conductance, net photosynthetic rate, transpiration rate, decreased the water use efficiency. All these reflected the phenotypic plastic adaption to the environment and the resource utilization strategy.
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