闽江河口湿地土壤速效磷时空分布与来源  

Spatial-temporal pattern and source of soil available phosphorus in Minjiang River estuarine wetland

作　　者：章文龙[1,2,3] 曾从盛[1,2,3] 陈晓艳[1] 林伟[1] 

机构地区：[1]福建师范大学地理科学学院,福州350007 [2]湿润亚热带生态-地理过程教育部重点实验室,福州350007 [3]福建师范大学亚热带湿地研究中心,福州350007

出　　处：《生态学杂志》2015年第1期168-174,共7页Chinese Journal of Ecology

基　　金：国家基础科学人才培养基金项目(J1210067);福建师范大学创新团队项目资助

摘　　要：选取闽江河口潮滩湿地作为研究区,于2013年5、8和11月沿水文梯度采集不同深度土壤,测定其速效磷含量,研究闽江河口潮滩湿地土壤速效磷沿水文梯度的时空分布特征;并进一步测定土壤全磷(TP)、有机磷(Org-P)和无机磷(IP)分级,利用通径分析揭示土壤速效磷来源。结果表明:5月和8月土壤平均速效磷含量分别为3.53±1.15和3.23±1.15 mg·kg-1,显著高于11月(1.96±1.07 mg·kg-1)(P<0.05);5、8和11月土壤速效磷空间分布格局相似,从高潮滩到中潮滩,其含量呈波动降低,并且表现为芦苇群落土壤速效磷含量显著高于短叶茳芏群落(P<0.05);在垂直方向上,高潮滩土壤速效磷含量大都随深度增加而降低,中潮滩其垂直变化不显著;在植物生长初期(5月),土壤Org-P和闭蓄态磷(O-P)是速效磷的主要来源;在植物生长旺盛期(8月)和生长末期(11月),土壤Org-P和铁磷(Fe-P)是速效磷的主要来源。To reveal the spatial-temporal pattern and source of soil available phosphorus （ AP ） across a subtropical tidal marsh, soil AP, total phosphorus （TP）, organic phosphorus （Org-P） and inorganic phosphorus （IP） speciation along a hydrological gradient were examined in Min- jiang River estuary of eastern China in May, August and November, 2013. The mean concentra- tions of soil AP in May （3.53±1.15 mg·kg-1 ） and August （3.23±1.15 mg·kg-1 ） were signifi- cantly higher than that in November （1.96±1.07 mg·kg-1） （P〈0.05）. The distribution patterns of soil AP in the three periods were similar, which showed a fluetuant decrease from high tidal marsh to middle tidal marsh and the higher value was observed in Phragmites australis soil com- pared with that in Cyperus malaccertsis soil （P〈0.05）. Additionally, we observed that soil AP de- creased with soil depth in high tidal marsh, while it slightly changed with soil depth in middle tidal marsh. Org-P, iron bound phosphorus （Fe-P） and occluded phosphorus （O-P） were con- sidered as main sources of soil AP in the different vegetation growth periods.

关 键 词：速效磷 时空分布 水文梯度 闽江河口 

分 类 号：S153.61[农业科学—土壤学]