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闽江河口湿地土壤速效磷时空分布与来源

章文龙1,2,3,曾从盛1,2,3**,陈晓艳1,林伟1   

  1. 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)
  • 出版日期:2015-01-10 发布日期:2015-01-10

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

ZHANG Wen-long1,2,3, ZENG Cong-sheng1,2,3**, CHEN Xiao-yan1, LIN Wei1   

  1. (1School of Geographical Sciences, Fujian Normal Universities, Fuzhou 350007, China; 2Key Laboratory of Humid Subtropical Ecogeographical Process of Ministry of Education, Fuzhou 350007, China; 3 Research Centre of Wetlands in Subtropical Region, Fuzhou 350007, China)
  • Online:2015-01-10 Published:2015-01-10

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。
 

关键词: 生理塑性, 进化, 人工选择, 表型塑性, 旱地小麦

Abstract: 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 Minjiang River estuary of eastern China in May, August and November, 2013. The mean concentrations of soil AP in May (3.53±1.15 mg·kg-1) and August (3.23±1.15 mg·kg-1) were significantly 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 fluctuant decrease from high tidal marsh to middle tidal marsh and the higher value was observed in Phragmites australis soil compared with that in Cyperus malaccensis soil (P<0.05). Additionally, we observed that soil AP decreased 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 considered as main sources of soil AP in the different vegetation growth periods.

Key words: phenotypic plasticity, dryland wheat, physiological plasticity, artificial selection, evolution