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11.
用流式细胞仪研究秋茄叶肉细胞大小和叶绿素含量与海水盐度的关系 总被引：4，自引：0，他引：4
采用离析的方法,应用流式细胞仪研究福建九龙江河口北岸不同地段秋茄(Kandelia candel)成熟叶片的叶肉细胞大小和叶绿素含量与海水盐度之间的关系。结果表明：叶肉细胞的大小和细胞内叶绿素含量与海水盐度的关系都呈倒“Z”字形,单位体积叶肉组织叶绿素含量与海水盐度的关系呈“N”字形。其中海水盐度为10时,秋茄单位体积叶肉组织叶绿素含量最高,细胞表面积、光合面积最大;海水盐度8～10时,随着盐度升高,单位体积叶肉组织叶绿素含量、细胞表面积向有利于提高光合强度方向发展;海水盐度在10～23时,随着盐度的升高,单位体积叶肉组织叶绿素含量、细胞表面积逐渐减小,朝提高抗盐性方向发展。从形态学的角度为阐明红树植物耐盐机理提供了资料。 相似文献
12.
The seasonal variability of leaf litter removal by crabs was observed from May 2006 to April 2007 in a Kandelia candel mangrove forest in Jiulongjiang Estuary, China. Daily average quantities of leaf fall ranged 0.85–3.86 gDW m−2 d−1, with high values in May, August, October and November. The whole-year's leaf fall was 6.48 t ha−1 yr−1 (1.81 gDW m−2 d−1). The standing stock of leaf litter on the forest floor was 7.78 gDW m−2 averaged from the whole year's data, with the lowest value in December (1.23 gDW m−2) and the highest in April (16.18 gDW m−2). Annually averaged removal (consumption on mangrove floor + burial in burrows) rate of leaf litter by crabs was 0.59 gDW m−2 d−1. High seasonal variability was observed in the removal rates of leaf litter by crabs. Removal rates in the winter months (December, January and February) were 0.07–0.09 gDW m−2 d−1, much lower than those in other months with values of 0.59–1.18 gDW m−2 d−1. Annually averaged percentage of leaf fall removed by crabs was 33%, with the highest values in September (reached 76%) and the lowest values in winter months. Of leaf litter removed by crabs, a large proportion was buried by crabs, and only 12% was consumed by crabs on the forest floor. Leaf litter removal rate, consumption rate on the forest floor, percentages of leaf fall and standing stock removed on the forest floor were significantly positively correlated with air temperature, indicating that leaf removal ability by crabs was higher in warm months than in cold months. 相似文献
13.
分别用吖啶橙染色荧光显微计数法和平皿分离计数法对秋茄内生细菌总量和可培养内生细菌数量的时空变化进行测定。结果表明,秋茄植株根茎叶内均含有大量的内生细菌,其中根茎叶内生细菌总量平均分别为4.35×107ind/g、6.31×107ind/g和5.02×107ind/g;可培养细菌总量平均分别为2.58×103cfu/g、1.76×103cfu/g和4.43×103cfu/g。其时空变化动态为:内生细菌总量根部变化基本平稳,而叶部和茎部均呈峰形变化,其峰值分别出现在5月和7月;可培养细菌数量根茎叶均呈峰形变化,根部峰值出现在9月,而茎叶部峰值均出现在3月。秋茄植株可培养的内生细菌数量占其内生细菌总量比率为(0.028.33)×10-4,秋茄植株体内仅有小部分的内生细菌为可培养,绝大多数内生细菌为不可培养或难培养。 相似文献
14.
Kangkuso Analuddin Sahadev Sharma Rempei Suwa Akio Hagihara 《Journal of Oceanography》2009,65(1):121-127
The crown foliage dynamics of Kandelia obovata (S., L.) Yong were investigated, including leaf recruitment, survival and leaf growth. Newly flushed leaves occurred successively
throughout the year, with a maximum in July and a minimum in January. The highest leaf death was in August, whereas it was
the lowest in January. The relative mortality rate of leaves seemed to depend on the season when new leaves flushed. The growth
pattern of leaves varied among seasons. The maximum leaf area was significantly larger in winter than in autumn, but showed
no significant difference between the winter and the other seasons. The half-expansion period and the intrinsic rate of increase
were respectively longer and lower in winter than in the other seasons. Therefore, leaves flushed in summer grew faster in
their initial stage and attained their maximum leaf area sooner than those flushed in winter. This most likely results from
the difference in temperature between summer and winter. The crown leaf area was almost stable throughout the year, as if
homeostatic control is likely to function. Stipule litterfall decreased significantly with increasing flower and propagule
litterfalls, indicating that a high production of flowers and propagules results in low leaf recruitment. This may be because
flower production and propagule growth impose a severe burden on K. obovata. 相似文献
15.
Analysis of cold tolerance on mangrove Kandelia candel leaf growing in different soil salinity along Jiulong River Estuary in South China showed that the cold tolerance decreased as the increase of soil salinity. The lethal temperatures of K. candel leaf were-10.4,-9.9 and-8.6℃ in Liaodong, Baijiao and Aotou, respectively. Under 1-2℃ cold stress treatment on detached leaves of K. candel, their caloric value gradually decreased, while electrolyte leakage gradually increased. The leaf＇s caloric value and electrolyte leakage in Aotou with higher soil salinity varied more largely than those in Liaodong with lower soil salinity. In K. candel leaf, total water content lowered a little, bound water content rose significantly and free water content dropped significantly with duration of cold stress. At the same time, reduction sugar, soluble sugar and starch content gradually decreased and sucrose content gradually increased. Bound water, free water and sucrose content in K. candel leaf from Aotou with higher soil salinity changed more slowly than those from Liaodong with lower soil salinity, but reduction sugar, soluble sugar and starch content in K. candel leaf from Aotou had faster variations than those from Liaodong. These data indicated that soil salinity can reduce cold tolerance of K.candel leaf by increasing negative effect of salt ions in cell membrane, inhibiting variations of water content, and aggravating consumption of material and energy. 相似文献
16.
探讨了秋茄叶中黄酮类物质的极谱特性,并进行了含量测定.结果表明,在pH值为9.18的硼砂底液中,以芦丁作对照品,秋茄叶中黄酮类化合物在峰电位Ep为-1 642 mV（vs.SCE）处产生一灵敏的二阶导数极谱波,在芦丁含量不超过1.4 mg/dm3范围内,该极谱波的峰电流（Ip）与芦丁的量之间呈良好的线性关系,据此建立了红树秋茄叶中总黄酮含量的极谱定量测定方法.该方法的检出限为0.02 mg/dm3.用此法测得红树秋茄叶中总黄酮含量为2.04%,回收率为96.4%～100.3%,相对标准偏差为3.19%,此方法灵敏、准确、干扰少. 相似文献
17.
Analysis of cold tolerance on mangroveKandelia candel leaf growing in different soil salinity along Jiulong River Estuary in South China showed that the cold tolerance decreased
as the increase of soil salinity. The lethal temperatures ofK. candel leaf were −10.4, −9.9 and −8.6 °C in Liaodong, Baijiao and Aotou, respectively. Under 1–2°C cold stress treatment on detached
leaves ofK. candel, their caloric value gradually decreased, while electrolyte leakage gradually increased. The leaf's caloric value and electrolyte
leakage in Aotou with higher soil salinity varied more largely than those in Liaodong with lower soil salinity. InK. candel leaf, total water content lowered a little, bound water content rose significantly and free water content dropped significantly
with duration of cold stress. At the same time, reduction sugar, soluble sugar and starch content gradually decreased and
sucrose content gradually increased. Bound water, free water and sucrose content inK. candel leaf from Aotou with higher soil salinity changed more slowly than those from Liaodong with lower soil salinity, but reduction
sugar, soluble sugar and starch content inK. candel leaf from Aotou had faster variations than those from Liaodong. These data indicated that soil salinity can reduce cold tolerance
ofK. candel leaf by increasing negative effect of salt ions in cell membrane, inhibiting variations of water content, and aggravating
consumption of material and energy.
Supported by the Found for Outstanding Young Teacher, the Ministry of Education, China. 相似文献
18.
Annual litter production in alien (Sonneratia apetala) and native (Kandelia obovata) mangrove forests in Shenzhen, China were compared from 1999 to 2010. S. apetala had significantly higher litter production than K. obovata, with mean annual total litter of 18.1 t ha−1 yr−1 and 15.2 t ha−1 yr−1, respectively. The higher litter production in S. apetala forest indicates higher productivity and consequently more nutrient supply to the estuarine ecosystems but may be more invasive due to positive plant-soil feedbacks and nutrient availability to this alien species. Two peaks were recorded in S. apetala (May and October), while only one peak was observed in K. obovata, in early spring (March and April). Leaf and reproductive materials were the main contributors to litter production (>80%) in both forests. These results suggest that the ecological function of S. apetala and its invasive potential can be better understood based on a long-term litter fall analysis. 相似文献
19.
福建漳江口本土红树植物秋茄替代互花米草生态修复效果定量评价 总被引：4，自引：0，他引：4
本文从生物群落结构、非生物环境质量及生态系统功能三个方面构建了滨海湿地生态修复效果定量评价指标体系,并对福建漳江口本土红树秋茄替代入侵种互花米草生态修复效果进行了定量评价。结果表明:秋茄可有效抑制互花米草的生长,其生长指标在4年修复样地和约15年修复样地的评分等级分别为"差"和"好",即红树植物生长缓慢,至少需要十余年的时间才能恢复到60%以上;修复工程的开展并未对底栖动物多样性产生显著影响,两修复样地评分均为"优";沉积物生源要素生态风险评价显示,漳江口滨海湿地受到较严重的氮污染,碳、磷含量也超过了正常范围;生态系统功能指标方面,4年样地评分低于0.8,属"劣"的级别,而约15年样地评分为2.32,属"中"的级别,其中食物网功能达到"优"的级别。两修复样地综合评分等级则为"差"和"中",表明虽然红树植物替代结合物理手段能够抑制互花米草生长,但其植物群落结构和生态系统功能的修复所需年限较长,需要投入很大的人力和资源。 相似文献
20.
不同盐胁迫时间下秋茄幼苗叶片膜脂过氧化作用的研究 总被引：16，自引：1，他引：15
对长时间和短时间盐胁迫下红树植物秋茄(Kandelin candel)叶片膜脂过氧化作用、叶绿素含量、电解质渗透率、叶片肉质化程度等与盐胁迫强度之间的关系进行了对比研究.结果表明,短时间盐胁迫和长时间盐胁迫下秋茄叶片超氧化物歧化酶(SOD)活性、丙二醛(MDA)含量、叶片肉质化程度等随盐胁迫强度的提高而有不同的变化规律.在短时间盐胁迫下,随基质盐度的提高,SOD活性(fw)变化呈“U”型,在盐度15～20处叶片SOD活性最低,MDA含量变化不明显,电解质渗透率和叶片肉质化程度先升高而后下降,在盐度20处最高;在长时间盐胁迫下,SOD活性先随盐度的提高而提高,当盐度高于10时又随盐度的提高而下降,而MDA含量随盐胁迫程度的提高而下降,电解质渗透率和肉质化程度却上升,不同盐胁迫时间下红树植物秋茄具有不同的耐盐机制.膜脂过氧化不是盐胁迫下秋茄叶片膜损伤的主要原因. 相似文献