摘要
选择双台子河口湿地3种样地:地表有植被活体(PA)、地表有植物死体(PD)与光滩(GT),共设置21个样点,测定土壤中全氮(TN)、全磷(TP)和全钾(TK)含量,比较了不同植被覆被条件对湿地土壤中营养元素含量及分布特征的影响。结果表明:GT、PD、PA样地土壤TN平均含量分别为0.79、1.01、1.29g.kg-1;TP为0.49、0.50、0.52g.kg-1;TK为22.29、23.01、23.40g.kg-1。不同地表覆被下土壤TN含量差异显著(P<0.05),TP、TK含量差异不显著(P>0.05;P>0.05),说明植被覆被能够有效增加土壤TN含量,而对TP和TK含量影响不大。垂直方向上TN和TP含量具有相似的特征,表现为PA>PD>GT,TK为PA>GT>PD。由表层至底层,TN含量先降低而后升高,TP含量在0～30cm深度内变化不大,在30cm以下土层升高,PA增加幅度最大;TK含量由表层至底层变化较大。在PA-PD-GT的湿地退化过程中,土壤TN、TP和TK分别减少38.6%、6.9%和4.7%。
Aimed to understand the effects of different cover condition on the main nutrients contents in wetland soil,three kinds of wetland plots in Shuangtaizi estuarine,i.e.,land with living vegetation（PA）,land with dead vegetation（PD）,and bare beach（GT）,were selected,and a total of 21 soil samples were collected,with their total nitrogen（TN）,phosphorus（TP）,and potassium（TK）contents determined.In the plots GT,PD,and PA,the soil TN content was averagely 0.79,1.01,and 1.29 g·kg-1,soil TP content was averagely 0.49,0.50,and 0.52 g·kg-1,and soil TK content was averagely 22.29,23.01,and 23.40 g·kg-1,respectively.Soil TN content differed significantly with cover condition（P0.05）,but soil TP and TK contents had no significant differences among the three plots（P0.05;P0.05）,indicating that vegetation could increase soil TN content effectively,but had little influence on soil TP and TK contents.In vertical direction,soil TN and TP contents showed similar distribution pattern,i.e.,PAPDGT,while soil TK was in the order of PAGTPD.With the increase of soil depth,soil TN content decreased after an initial increase,soil TP content changed little at 0-30 cm but increased below 30 cm,with a significant increase in PA,while soil TK content changed greatly from the surface to deep layer.In the degrading process of PA-PD-GT,soil TN,TP,and TK contents decreased by 38.6%,6.9%,and 4.7%,respectively.
出处
《生态学杂志》
CAS
CSCD
北大核心
2010年第11期2117-2121,共5页
Chinese Journal of Ecology
基金
国家水体污染控制与治理科技重大专项资助项目(2008ZX07208-009)
关键词
覆被条件
全氮
全磷
全钾
cover condition
total nitrogen
total phosphorus
total potassium
