文献类型：期刊文献

中文题名：杭州湾潮滩湿地植物不同分解过程及其磷素动态

英文题名：Decomposition and Phosphorus Dynamics of the Litters in Standing and Litterbag of the Hangzhou Bay Coastal Wetland

作者：邵学新[1,2] 梁新强[1] 吴明[2] 叶小齐[2] 蒋科毅[2]

第一作者：邵学新

机构：[1]浙江大学环境保护研究所;[2]中国林业科学研究院亚热带林业研究所

年份：2014

卷号：0

期号：9

起止页码：3381-3388

中文期刊名：环境科学

外文期刊名：Environmental Science

收录：MEDLINE(收录号：25518655);CSTPCD;;Scopus;北大核心:【北大核心2011】；CSCD:【CSCD2013_2014】；PubMed;

基金：国家自然科学基金项目(31000296;41271314);林业公益性行业科研专项(201404210)

语种：中文

中文关键词：杭州湾;枯死物;分解;磷;影响因素

外文关键词：Hangzhou Bay;;litter;;decomposition;;phosphorus;;influencing factors

分类号：X173;X52

摘要：湿地植物枯死物分解影响湿地营养物质循环.为分析杭州湾潮滩植物枯死物分解过程和磷素动态,开展了3种优势植物芦苇(Phragmites australis)、互花米草(Spartina alterniflora)和海三棱藨草(Scirpus mariqueter)立枯阶段的观测和分解袋法模拟实验.结果表明,观测期间立枯干物质量逐渐降低,180 d后逐步凋落至地面;立枯磷含量则波动下降.植物分解具有明显的阶段性,初期(0~15 d)损失最快,然后降低.地下根系分解速率表现为:海三棱藨草>芦苇>互花米草,地上部分则相反.分解95%所需时间在1.2~8.3 a之间.植物磷含量先下降后上升,绝对含量则表现为净释放.分析表明,植物分解速率与C/N比没有显著的相关关系,而受C/P比的影响较大.环境因子中的大气温度对分解也有影响.立枯阶段和分解袋法模拟下植物所处的环境不同是影响两者分解过程差异的主要原因.
Wetlands litter decomposition affects wetlands nutrient cycling. The decomposition progress of standing litter was monitored and the litterbag simulation experiment was carried out in order to analyze dynamics of litter decomposition and phosphorus release in Phragmites australis( PA),Spartina alterniflora( SA) and Scirpus mariqueter( SM) marshes of Hangzhou Bay coastal wetland.Results show that the dry mass of standing litter and P concentration decrease gradually and the litter drops to the sediment surface after180 d. There are distinctive stages of the plant litter decomposition in litterbag simulation experiments. The loss rate is faster during 0-15 d than that of later days. The loss rate in root decomposition of three plants are SM > PA > SA,while the trend is opposite for that of aboveground tissues. The time needed for 95% of dry mass decomposition in the plant tissues is between 1. 2-8. 3 a. The P concentration in litters decreases rapidly in the initial stage and then increases slowly while the net P pools decreases all the time.Pearson's correlation coefficient shows that there is no significant correlation between the litter decomposition rate and C /N ratio.However,the litter C /P ratio affects greatly on plant decomposition rate. Environmental factors in the atmospheric temperature also have an impact on the decomposition rate of leaves. The different decomposition progresses between standing litter and litterbag are caused by environmental factors.