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Flavonoids in plants is very important in its ecological role and economic value. The dynamic features of flavonoids content
in different organs of larch (Larix gmelinii) at different light and temperature conditions were investigated in this study. Results showed that the order of flavonoids
content in different organs from high to low was 7.78% (stem bark)>2.79% (leaves) >1.72% (branches) >1.19% (stem xylem)and
different organs had a great seasonal variation in flavonoids content, but the change of flavonoids content at different temperature
was not obvious in different organs., The content of flavonoids in barck had, a positive correlation with temperature (R
2=0.75), but that in other organs had slight variation with the change of temperature. For all the tested organs, the flavonoids
content in summer and autumn was approximately 3–4 times higher than in spring and winter. This is attributed to the great
stress from environmental physical variables such as UV radiation, high temperature that induce the accumulation of flavonoids.
The flavonoid content of sun leaves was evidently higher than that of shade leaves, and leaves at upper part of canopy had
a higher flavonoids content compared with that at other parts. This result indicates that sun radiation could improve flavonoids
production in leaves (R
2=0.76). The flavonoids may actively evolve in plant defenses to environmental stress, protecting larch from the damage of
high temperature and radiation, and its main function is different in different organs.
Foundation item: This paper is supported by the National Natural Science Foundation of China (30300271) and the Key Project of Chinese Ministry
of Education (104191).
Biography: WANG Wen-jie (1974-), male, Lecturer in Key Laboratory of Forest Plant Ecology, Northeast Forestry University, Harbin 150040,
P. R. China.
Responsible editor: Zhu Hong 相似文献
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大兴安岭是我国重要森林基地之一,兴安落叶松又是大兴安岭主要树种,森林面积大,蓄积量多,木材坚硬,力学强度高,可作枕木、矿柱、桩木、电杆、桥梁、建筑、车辆及其他利用。但据笔者调查,该树种普遍受小蠹虫危害,轻者引起立木枯梢,生长势衰弱,重则导致成片枯黄甚至死亡,尤其是楞堆(场)中未剥皮的原木上,危害更甚。该虫虫体小,钻入树皮下面为害,生活十分隐蔽,不轻易被发现,故国内、外目前对这方面报道甚少。据本人多年来对兴安落叶松小蠹虫区系进行专门调查,危害兴安落叶松林分的小蠹虫有20多种。现整理于后,供有关方面的参考。 相似文献
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基于树干解析的兴安落叶松人工林单木生长模型研究 总被引:1,自引:0,他引:1
大兴安岭林区兴安落叶松(Larix gmelinii)作为建群种,其人工林资源的面积、蓄积正在不断扩大,成为了大兴安岭林区森林资源的有效补充。利用内蒙古自治区第二林业监测规划院(简称林勘二院)提供的解析木原始数据,采用SPSS V19.0拟合树木生长方程,分别建立了兴安落叶松人工林单木树高和胸径生长模型,对两个模型进行检验、评价,得到其回归系数(R~2)、均方误差(MSE)以及拟合效率(EF),结果均符合模型检验标准,证明模型具有较高的稳定性和估计性。最终确定兴安落叶松人工林树高生长模型为H=22.588(1-e~(-0.032t)),胸径生长模型为■。 相似文献
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Arabinogalactan (AG) obtained from Larix gmelinii R. waS purified with the method of macroporous resin adsorption. Effects of various parameters on the adsorption, including adsorption time and temperature, the concentration and the dosage of raw AG the reused numbers of resin, were investigated. The effect of purification was tested through the removal rate of impurity and the contents of AG and impurity. The optimal condition was determined as follows: adsorbed at 30℃ for 2 h with the concentration of raw AG 〈0.1 g·mL^-1 and its dosage 〈 7 mL, the dose of resin was 3 g and reused for 4 times. On the basis of these, macroporous resin column was used for AG purification. The result showed that the AG yield could reach 68.28% with sugar content of 95.02%. The analysis of IR and UV showed that the effect of macroporous resin characteristics on the purification of AG was significant. The obtained product had the same functional groups with standard sample. 相似文献
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长白落叶松人工林全林分生长模型的研究 总被引:1,自引:0,他引:1
林分生长模型是指描述林分生长与林分状态和立地条件关系的一个或一组数学函数。关于林分生长模型的研究,是在研制各种生长过程表(收获表)中逐渐兴起的,经历了由经验回归模型到根据林分生长规律演绎出来的理论模型,由单因子的简单模型到多因子的综合模型的发展过程。目前,林分生长模型多采用RICHARDS生长方程[2,5]。该生长方程最初用于描述动物的生长,后经多人研究证明也适用于描述植物。该方程导出时只是时间变量的简单模型,经修正加入立地因子后,变为时间——立地 相似文献
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文章从更新数量、质量、生长分析等方面对草类-兴安落叶松林天然更新进行了全面研究,并提出相应经营措施。 相似文献
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兴安落叶松人工林内易燃物载量变化规律的探讨栗荣萍,罗贵平(大兴安岭林业科研所)(加格达奇林业局)朱万昌,张宏俊,刘芳生(大兴安岭林业科研所)森林火灾的发生和发展同其它燃烧一样受“三要素”的制约.即可燃物、火源和气候条件.其三者是缺一不可的、只有三者同... 相似文献
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高寒地区华北落叶松人工林生长分析 总被引:1,自引:0,他引:1
通过标准地实测和解析木计算分析表明,在甘南州引种华北落叶松是成功的,已发挥了较高的生态效益和经济效益;本文还揭示了华北落叶松幼林生长规律和发展华北落叶松最佳适生范围。 相似文献
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文章利用 85 0个调查样方和 6 5株更新苗解析木资料 ,对蒙古栎—兴安落叶松林天然更新进行了年龄结构分析和生长模拟及预测。 相似文献
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石塘—兴安落叶松林在几乎没有土壤的条件下,能够生长繁衍,一旦群落遭到破坏,是难以恢复的。通过分析石塘—兴安落叶松林的生长过程,发现其生长规律,为保护石塘—兴安落叶松林生态群落提供依据。 相似文献
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以扎兰屯地区3种不同密度33年生兴安落叶松人工林为研究对象,分析兴安落叶松人工林下物种的重要值、丰富度指数、多样性指数、均匀度指数和相似系数随林分密度的变化规律。结果表明:兴安落叶松林下共出现植物11科29属31种。草本层物种组成、植物丰富度指数、多样性指数随着林分密度的增大,均先增加后降低。各指数与林分密度的相关性分析表明,草本层的多样性指数、草本层的均匀度指数与林分密度均表现出较高的相关性。随着林分密度增大,林下共有种减少,相似系数降低。人工林密度为1 751.89株/hm2时,林下草本层物种丰富度指数、多样性指数、均匀度指数均达到最高,表明此密度下兴安落叶松人工林群落稳定性最好。 相似文献
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利用内蒙古大青山32株华北落叶松解析木数据,分析研究华北落叶松人工林的树高、胸径、年龄、材积之间的关系,并选取对数模型、理查德模型、考尔夫方程和逻辑斯蒂方程等4个常用的生长模型对树高、胸径、材积生长量进行拟合.结果表明:效果好的生长模型分别为胸径对数模型y=-24.03+ 11.28×Log(x+1.99),树高理查德模型Y=27.27×[1-Exp(-0.041 ×x)]△1 5735,材积理查德模型y=7495.55×[1-Exp(-0.001×x)]△3.13.经F检验(F <0.05) =6.94,呈显著.3个预测模型的标准误差、平均百分误差、平均绝对百分误差都非常小,平均相对误差均在±2.5%以内,预测值与实测值无显著差异(p=0.05). 相似文献