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漳江口红树林区互花米草的生长特性及其与秋茄的相对竞争力
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生态学
植物生理生态植物生理生态
    本研究调查了外来入侵植物互花米草在漳江口红树林自然保护区的分布状况。选择代表性土著红树植物秋茄,测定秋茄和互花米草成熟叶片的光合特性、叶绿素含量、渗透势、质膜透性、自由水与束缚水含量等生理特性,对比分析二者对潮间带生境的适应能力;沿漳江流域从上游到出海口设置4个样地,跟踪测定1个生长季内不同生长阶段互花米草的生长特征,探讨潮间带环境因子和互花米草的个体和群落生长之间的关系。同时,在对应的样地内,通过人工插植秋茄胚轴,定期调查秋茄胚轴的数量和秋茄幼苗的生长,探讨互花米草群落对秋茄幼苗更新生长的影响,研究结果如下:
    1. 漳江口红树林自然保护区沿江不同盐度梯度下都有互花米草的生长分布,相比红树植物,互花米草具有较宽的生态幅度,盐度适应范围也较广(2‰~30‰),且不同盐度具有不同的分布状况,说明互花米草可以通过自身的表型可塑性来调节适应不同的环境水平。
    2. 在相同环境条件下,互花米草叶片的净光合速率均高于红树植物秋茄,且差异极显著(p<0.01),其中在秋茄分布下限的样地中,互花米草的净光合速率是秋茄的2.14倍;秋茄叶片的蒸腾速率及气孔导度随着盐度的升高速度下降较快,且低于互花米草;不同样地的互花米草叶绿素含量均高于秋茄,叶绿素a的含量最高可以达到1.13±0.15 mg.g-1;互花米草的渗透势较低,最低只有-3.50±0.12 Mpa,能够在较高的盐境条件下积累更多的渗透调节物质,具有较强的渗透调节能力,同时,电解质外渗率高于秋茄,可以通过自身的调节机制来减少细胞膜所受的伤害,从而适应恶劣的环境胁迫;互花米草与秋茄的含水量差异极显著(p<0.01),比秋茄具有更高的束缚水含量,保水能力较好,说明相对于红树植物,互花米草在生理上具备一定的优势,而正是由于互花米草在生理上的优势可能导致其与红树植物之间竞争上的优势,从而使其能够在红树林群落中成功入侵。
    3. 互花米草主要以无性繁殖的方式扩散,苗期是快速扩散时期,在互花米草与红树植物分布集中区,互花米草在苗期的扩散距离最大,可达到238±20 cm,适当的盐度(15‰左右)可以促进互花米草的繁殖扩散,25‰以上的高盐度对互花米草的繁殖扩散则有明显的抑制作用;土壤有机质含量与互花米草的生长呈极显著正相关(p<0.01),盐度对互花米草的生长有显著的抑制作用,随着沿江盐度的增加,互花米草的株高、基径、叶面积都显著降低,在25‰以上的高盐度,互花米草生长才开始受到较大的抑制;单株生物量也是随着盐度的升高呈现下降的趋势,但是盐度在15‰左右互花米草具有较大的单位面积生物量,这表明15‰左右的盐度是互花米草群体生长的最适范围。4.秋茄胚轴的萌芽生长一般在1个月左右,潮汐的涨落、潮间带螃蟹等动物的啃食以及滩涂的盐度等都会影响胚轴的固着生长,以最上游样地中的固着率最高,达到97.5%,最下游样地的固着率只有22.5%;在秋茄幼苗的生长过程中,光照是极其重要的因素,由于互花米草遮荫的影响,秋茄幼苗的生长缺乏正常的光照而生长缓慢,茎杆纤细,叶片由于光照不足部分失绿;到了生殖生长期以后,互花米草全部倒伏,秋茄幼苗由于互花米草的倒伏覆盖完全失去光照,最终全部死亡。 [英文摘要]:     This study investigated the distribution of the invasive plant Spartina alterniflora along the Zhangjiang River in Fujian. Choosed the representational indigenous mangrove species Kandelia obovata, photosynthetic characteristics, chlorophyll content, osmotic potential, membrane permeability, free water and bound water content and other physiological characteristics of mature leaves of K. obovata and S. alterniflora were measured, and their adaptability to the intertidal habitats were analyzed. According to the distribution of plant community, this study set up four sample plots along the Zhangjiang River from the upstream to the downstream, growth characteristics of S. alterniflora in differeant growth phases were measured within one year, and the relationship between environmental factors and the growth of S. alterniflora were analyzed. At the same time, in the corresponding plots, we survey the number of K. obovata hypocotyl and the growth of K. obovata seedings through artificial implantation of K. obovata hypocotyl, the influence of the S. alterniflora community to the growth of K. obovata seedings were discuss. And the research results are as follows:
    1. S. alterniflora can grow and propagate along the river under different salinity gradients in Zhangjiang Estuary, compared to mangrove species, it has a wider ecological amplitude, as for the wider scope to adapt the salinity (2‰~30‰), and a different distributional state to different salinity. Show that S. alterniflora can adapt themselves to the different level of environment by phenotypic plasticity.
    2. In the same environmental conditions, the chlorophyll content and net photosynthetic rate in S. alterniflora are higher than K. obovata, and the difference is significant (p<0.01); the transpiration rate and stomatal conductance of K. obovata leaf decline more quickly as the salinity decreasing, and lower than the S. alterniflora; S. alterniflora has lower osmotic potential and can accumulate a lot of material that can regulate the osmotic potential in the environment that has higher salt level. At the same time, its electrolyte extravasation rate is higer than those of K. obovata, and it can reduce the harm to the cytoplasm throgh its self-regulatory ability, so that which can adjust the extream environment. The water content between S. alterniflora and K. obovata are quite different (p<0.01). The S. alterniflora has higer bond water content than that of K. obovata, which indicate that S. alterniflora has better ability of stranding the water.
    3. S. alterniflora proliferates by asexual reproduction. The seeding stage spreads rapidly. The appropriate salinity (about 15‰) stimulated the proliferation of the S. alterniflora while higer salinity (above 25‰) inhibited its proliferation. As the salinity increasing along the the river, the height, basal diameter and leaf area of the S. alterniflora are decreasing significantly. In the salintiy level of 25‰, the growth of the S. alterniflora start to be inhibited. Above-ground biomass of the individual decreased with the increase of the salinity. Howerer, the S. alterniflora has higher above-ground biomass per area which indicate that the 15‰ salinity is the most appropriate salinity of the growth of the groups of the S. alterniflora.
    4. Hypocotyl of K. obovata can germinate within one month. Boitic and abiotic factors such as inter-tidal animal predation, tidal fluctuation, light and salinity could affect the fixation of the hypocotyl of the K. obovata. During the growth of the seedlings, light is an important factor. Being sheltered by the S. alterniflora, the seedlings of K. obovata grow slowly which has thinner stems and yellow leaves. Most of all, mature S. alterniflora plants were lodged in autumn, the seedlings of K. obovata were sheltered completely and died for starving of light. [参考文献]:     [1] Adam P. Saltmarsh Ecology [M]. Cambridge: Cambridge University Press. 1990.
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