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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。
The tidal flat wetlands of Minjiang estuary were selected as the study area. The soil samples collected at different depths along the hydrological gradient in May, August and November of 2013 were used to determine the content of available phosphorus. The temporal-spatial distribution of available P in the tidal flat wetlands along the hydrological gradient was studied Characteristics of TP, Org-P and IP in soil were further determined. Path analysis was used to reveal sources of available P in soils. The results showed that the average available phosphorus in soil was 3.53 ± 1.15 and 3.23 ± 1.15 mg · kg-1 in May and August, respectively, significantly higher than that in November (1.96 ± 1.07 mg · kg-1) (P <0.05) The spatial distribution patterns of soil available P in August and November were similar. The content of soil available P fluctuated from high tide beach to mid-tide beach, and the content of available phosphorus in the reed community was significantly higher than that of the short-leaved Abercrombie Park (P <0.05) In the vertical direction, the contents of available phosphorus in the high tide land mostly decreased with the increase of depth, and the vertical variation of the tide beach was insignificant. In the early stage of plant growth (May), the soil Org-P and the closed-storage phosphorus The major source of soil available phosphorus was Org-P and iron-phosphorus (Fe-P), which were the main sources of available phosphorus during the period of vigorous growth (August) and end of growth (November)