Factors influencing mangroves intertidal zonation

红树林生态系统中存在明显的分带现象,影响其分带的因素包括自身因素和环境因素。自身因素主要有繁殖方式的差异、繁殖体散布能力(包括大小、形状、漂浮性等)和定植能力(如根萌时间等)、繁殖体能量积累(从花到成熟繁殖体单位质量的能量增加值)、幼苗解剖和生理学特征。环境因素主要有土壤理化条件(如盐度、氧化还原状况、pH、硫含量)和生物因素(动物啃食、种间竞争)。上述每种因素在特定的区域都有可能成为影响红树林分带的主要因素。It is obvious that the mangrove forest ecosystem has zonation phenomenon, and the factors influencing mangrove zonation including inherent and environmental factors. Inherent factors include the difference in reproduction types, dispersal capacity of propagule (size, shape, buoyancy, etc.) and anchoring ability (such as rooting time), propagule energy accumulation (increasing energy per unit mass from flower to mature propagule), anatomical and physiological characteristics of seedlings. Environmental factors include soil physiochemical conditions (salinity, redox, pH and sulfur content) and bio-factors (animal predation, interspecific competition). Each factor described above may be the main factor influencing mangrove zonation in a special region.教育部新世纪优秀人才计划项目;; 国家自然科学基金资助项目(40476040

Fractal characteristics and related affecting factors of particle size distribution in mangrove soils in Dongzhai Harbor of Hainan

应用分形理论分析了海南东寨港红树林土壤粒径分布的分形特征及其影响因素,海南东寨港土壤的分形维数为2.302～2.575,分形维数的大小与土壤中的粘粒、盐分、有机质、全氮含量呈显著正相关,外滩红树林土壤的分形维数低于中滩和内滩;随着土壤质地由砂壤土、轻壤土、中壤土、重壤土的变化,分形维数逐渐增大;从陆到海土壤分形维数逐渐减小。群落类型、土壤质地、滩位、含盐量、有机质、全氮含量等是影响海南东寨港红树林土壤分形维数的主要因子。The analysis with fractal theory on the fractal characteristics and related affecting factors of particle size distribution in mangrove soils in Dongzhai Harbor of Hainan showed that the fractal dimension of mangrove soils ranged from 2.302-2.575.There was a significant positive linear relationship between the fractal dimension and the contents of soil clay,salts,organic matter and total nitrogen.The fractal dimension was lower in outside beach than in middle and inner beach,and changed with soil texture,being in the order of sandy loam<light loam<medium loam<heavy loam.From land to sea,the fractal dimension decreased gradually.The main factors affecting the fractal dimension were community type,soil texture,beach position,soil salinity,and organic matter and total nitrogen contents.教育部新世纪优秀人才计划(NCET);; 国家自然科学基金资助项目(40476040

Coagulation Performance of Flocculants Composed of Polysilic Acid and Al30

制备了一种新型的复合聚硅铝三十（PSiAl30）类絮凝剂，与常规聚合氯化铝PAC（以Al13为主）和Al30絮凝剂作对比，通过烧杯混凝实验，考察了其对腐殖酸一高岭土悬浊液的混凝效果。结果表明，复合硅的PSiAl30系列既有Al30的电中和能力，又起吸附架桥作用。PSiAl30圳絮凝剂对水体酸碱度影响小，可适用于低碱度水体。弱碱性范围内，硅，铝比为0．05的PSiAl30有最高的TOC去除率，最低的投药量，并能显著提高对非芳烃类的去除能力

Coagulation Performance of Flocculants Composed of Polysilic Acid and Al_(30)

A new type of flocculant composed of polysilic acid and Al_30(PSiAl_30) was synthesized.Comparing with Al_30 and traditional PAC dominated by Al_13,its performance on coagulation of humic kaoline suspension was studied.Results showed that the composites may exert both charge neutralization as Al_30 and bridge absorption as polysilic acid.PSiAl_30 is more adaptable for application in aquatic system with low alkalinity since it less affects pH of suspension.PSiAl_30 with Si/Al molar ratio of 0.05 is optimal in coagulation for the highest TOC removal,lowest dosage and improving the removal of non-aroma matters in humic acid significantly.</p

Effect of Kandelia candel mangrove restoration on sediment phosphorus in Jiulongjiang estuary

以光滩为对照,分别在白礁选取5、6、8a生秋茄(Kandelia candel)人工林以及天然秋茄林为样地,在草埔头选取20a生和44a生秋茄人工林为样地,比较分析了福建九龙江口秋茄红树林恢复对底质总磷和有效磷的影响.结果表明:白礁和草埔头秋茄人工红树林的总磷和有效磷含量随红树林恢复时间的增加而增高.白礁天然秋茄林和草埔头秋茄人工林的总磷随底质深度增加而减少,有效磷在中下层含量较高.潮位对草埔头总磷有显著影响,由外滩到内滩,其总磷含量逐渐增加.九龙江口秋茄红树林早期恢复阶段的底质总磷和有效磷缺乏,5a生秋茄人工林底质总磷和有效磷分别为0.68g/kg和2.99mg/kg.Effects of the restoration of Kandelia candel mangroves on soil total phosphorus and available phosphorus were investigated in Jiulongjiang estuary.At Baijiao,one five-year old replanted forest,one six-year old replanted forest,one eight-year old replanted forest,one nature mature forest and one plot of barren beach were selected.Meanwhile,one twenty-year old replanted forest,one forty-four-year old replanted forest and one barren beach plot at Caoputou were selected.Results indicated that the total and available phosphorus increased with restoration time at Baijiao and Caoputou.Total phosphorus decreased with sediment depth,while available phosphorus was usually high in mid and lower layers at Baijiao and Caoputou.Tide level had remarkable effects on the distribution of total phosphorus resulting in lower phosphorus content in the outer flat than in the inner.In Jiulongjiang estuary,the sediments in replanted K.candel mangroves were both short of total and available phosphorus,especially during the early phases of mangrove development,which were 0.68g/kg and 2.99mg/kg respectively in five-year old replanted forest.国家自然科学基金资助项目(40476040);; 福建省自然科学基金资助项目(D0410006