Mangrove Ecosystem and Its Ecological Value

论述了红树林生态系统的特点和功能 ,认为它是极其独特的生态系统。其生态价值包括有机物生产、造陆护堤、净化水体、多样性保护和生态旅游等 ,具有重要的生态保护意义This paper deals with the features and functions of the mangrove ecosystem and thinks it to be an extremely unique ecosystem.Its ecological value includes the organic matter production,epeirogeny and dike protection,water purification,diversity protection,ecological tourism,etc.and it possesses the important ecological protection significance

SEVEN METAL ELEMENT'S BIOLOGICAL ACCUMULATION AND CIRCULATION OF SONNERATIA APETALA PLANTATION IN LEIZHOU, GUANGDONG

在雷州市附城镇岚北人工生态恢复的 7a生无瓣海桑群落生物量调查的基础上 ,对所采集的无瓣海桑进行了植物体各组分样品的灰分和元素含量测定与循环分析 ,结果表明 :无瓣海桑植物体不同组分的灰分含量范围为 2 .2 7%～ 2 6 .4 1% ,以细根的含量最高 ,枯枝的含量最低 .植物体各组分中 7种元素质量分数范围分别为K 0 .11%～ 1.5 6 % ,Na0 .11%～ 1.6 6 % ,Ca 0 .2 0 %～ 2 .6 6 % ,Mg 0 .15 %～ 1.5 9% ,Fe 0 .0 4× 10 -3 ～ 9.6 4× 10 -3 ,Zn 0 .0 5× 10 -4～ 1.0 3× 10 -4,Cu0 .16× 10 -5～ 1.5 0× 10 -5.其加权平均的富集系数为 0 .0 5～ 9.70 ,其中Ca >K >Cu >Na >Mg>Zn >Fe .群落现存生物量中的累积储量分别为K 10 9.76gm-2 ,Ca 138.89gm-2 ,Na 86 .5 7gm-2 ,Mg 81.0 7gm-2 ,Fe 13.139gm-2 ,Zn 0 .4 83gm-2 ,Cu 0 .10 8gm-2 .... 【英文摘要】 Based on the former biomass survey results of the seven-aged restored Sonneratia apetala community in Lanbei, Fuchen, Leizhou, the results from the analysis on ash and elemental contents of the S. apetala samples collected from the survey showed that the ash contents of different parts of S. apetala were between 2.27%～26.41%, with the highest in fine root and the lowest in dead branch. The elemental mass fraction in different partitions of S. apetala as K 0.11%～1.56%, Na 0.11%～1.66%, Ca 0.20%～2.66%, Mg 0.15...中国-荷兰雷州半岛红树林综合管理和海岸保护项目部分资助~

Spatial pattern of dominant tree species of the secondary monsoon rain forest in Lianjiang, Guangdong Province

根据所调查样方的树种综合优势比值，对广东西部(粤西)廉江谢鞋山次生季雨林最重要的三个建群树种，进行了空间格局分析。分析方法采用了Poisson分布、负两项分布、Neyman分布的频次比较模型和聚合度指数测定以及Taylor指数和 Iwao's 方程模拟。结果表明这三个建群种均符合聚集分布。荔枝（Litchi chinensis ）和山杜英（Elaeocarpus sylvestris）两种群有基本型聚集分布的特点并表现出个体间的聚集现象。橄榄（Canarium album）有可能随着密度的增大而趋于均匀分布。树种的空间分布格局依赖于其繁殖特性之外，还受该次生季雨林保护的影响。这些主要建群种的空间格局表明进行该林区保护的迫切性。Based on the summed dominance ratios of species in sample plots, the first three dominant species (Litchi chinensis, Elaeocarpus sylvestris and Canarium album) of the secondary monsoon rain forest of Mt. Royal Shoe in Lianjiang City, western Guangdong, were chosen for analyzing their spatial distribution pattern with the analysis methods such as frequency models of Poisson Distribution, Two Negative Items Distribution, Neyman Distribution, aggregate indexes, Taylor exponential equation and Iwao's equation modeling. The results showed that these three species distributed in the congregate spatial pattern. Litchi chinensis and Elaeocarpus sylvestris had the characteristic of basic congregate population and attractive characteristic between their plants. The patterns for Canarium album may change and become more evenly distributed with the increase of density. The overall species spatial pattern also depended on the conservation of the secondary monsoon rain forest besides it was affected by the species reproduction characteristics and its growing environment. The congregate spatial patterns of three dominant species showed that it is important to conserve forest urgent conservation of the forest

Mangrove flora and associations of Leizhou Peninsula

作者简介: 韩维栋( 1963-) , 男, 江西会昌人, 博士, 副教授, 从事生态学与植物分类学教学与科研工作。[中文文摘]综述了前人对雷州半岛的红树林的研究;根据作者的调查研究报道了雷州半岛的红树林面积、树种组成、群落类型与结构。[英文文摘]This article summarized former mangrove researches in Leizhou Peninsula and descr ibed the mangrove species, associations and their structure in Leizhou Peninsula based on the author's invest igation.中荷合作雷州半岛红树林综合管理和海岸保护项目资助(IMMCP 01

钒对焙烧碳电极电化学氧化的催化作用

在酸性水溶液中。70—80℃下,含钒(0.1—0.5%)焙烧碳阳极可以被电化学氧化到 CO_2,电效达,80—90%电流密度可以维持长时间恒定(>24br)。含氧有机功能团在碳表面上形成之化学吸附键的断裂在决定速度控制环节中可能是重要的

电解精炼回收废海绵钛及对电极过程机理的初步分析

在50安培中心阴极密闭氩气保护电解槽中,采用NaCl-KCl-TiCl_3-TiCl_2熔盐,以天化钠还原之废海绵钛做可溶阳极,进行条件实验。在实验中配合熔盐中变价钛离子的化学分析、阴极沉积金属的显微照象观察以及电子探针测定,以便较深入地了解了钛电解精炼的内在规律,为下一步进行废钛合金回收奠定了基础,并且探索熔盐电解直接

不同基底非晶态镍钨合金电沉积中氢的作用

研究了三种材质基底上非晶态镍钨合金电沉积过程中阴极析出氢的影响．结果表明，玻璃碳中氢的吸收不可能发生，钯中氢的扩散和吸收是迅速的，镍的行为介乎其间．在玻璃碳上可以生成平整的、厚度较大的、有金属光泽的镍钨镀层，镍上也发现了沉积物，而钯上没有任何新相沉积，由此肯定了氢在镍钨合金诱导共析过程中的重要性

The Analysis on Woody Flora of Hua'an County, Fujian

福建华安县木本植物区系组成丰富 ,共有 86 9种 5亚种类 4 8变种 8变型 ,隶属 118科 36 5属 .其中引种栽培树种 89种 ,隶属 38科 79属 .它以热带性科属种为主体成分 ,表现出区系组成的古老特性 .在同属于中国 -日本森林植物亚区内 ,福建华安县与江西武功山和贵州荔波县在木本植物区系属的水平上具有很高的相似性 ,相似系数分别为 88.2 %和 79.1%;它在种的水平上表现为与江西武功山最为相近 ,其次为与武夷山、荔波县相近 ,然后与台湾相近 ,相似系数分别为 5 7.7%、4 3.9%、38.0 %和 33.8%.表明华安与这些地区在区系起源上的共同性和区系组成上的差异性The woody flora of Hua'an County, Fujian Province, comprises 118 families, 365 genera, 869 species, 5 subspecies, 47 varieties, and 9 forms. Its main components belong to tropical distributional patterns with ancient species origin characteristics on all taxon level (family, genus and species). The woody flora of Hua'an was analysed and compared with those of Wugong Mountain in Jiangxi Province and of Libo County in Guizhou Province, since they all belong to the China Japan Forest Distribution Sub area, and its similarity indexes of mutual distributional genera to the late two are 88.2%, and 79.1% respectively. It also shares 375 species, 330 species and 324 species woody plants as well as with similarity indexes of 57.7%?43.9%?38.0% and 33.8% with floras of Wugong Mountain, Wuyushan Mountain, Libo County and Taiwan respectively, showing both their relative degrees of flora similarities and the feature of same flora genesis

电解成型铁箔的结晶形态

铁箔的电结晶形态与电沉积条件、温度和阴极电流密度有关.晶粒间界和氢夹杂造成了铁箔电阻率和显微硬度的提高