滨海红树林恢复对土壤碳氮磷含量及化学计量特征的影响

Effects of the Coastal Mangrove Restoration on the Soil Carbon,Nitrogen and Phosphorus Content and Stoichiometric Characteristics

为探究红树林恢复对土壤碳、氮、磷含量的影响,选择福鼎市人工红树林湿地、天然红树林湿地以及养殖滩涂作为研究对象,开展原位和室内分析,以探讨红树林恢复对于土壤养分动态的影响。结果表明:(1)相比于天然红树林湿地,人工红树林恢复提升了土壤氮磷含量,同时其碳含量也恢复到了天然红树林湿地的水平。(2)不同湿地类型间,养殖滩涂土壤的碳储量和磷储量最高,相比于天然红树林湿地,人工红树林恢复提升了土壤氮和磷储量。(3)不同湿地类型土壤碳氮磷比,总体表现为碳磷比>碳氮比>氮磷比;碳氮比为养殖滩涂>天然红树林>人工红树林,碳磷比和氮磷比为天然红树林>人工红树林>养殖滩涂。研究显示,随着红树林的恢复,其生态功能逐渐恢复到天然红树林的水平,但其碳储量相较于养殖滩涂并没有太大的优势。未来应开展更长时间尺度的观测与研究,以厘清红树林恢复调控土壤碳和养分动态的过程与机制。

In order to explore the effect of mangrove restoration on the soil carbon,nitrogen and phosphorus contents,the artificial mangrove wetland,natural mangrove wetland and aquaculture tidal flat in Fuding City were selected as the research objects,and the in-situ and laboratory analysis was carried out to explore the effect of mangrove restoration on the soil nutrient dynamics.The results showed that:(1)Compared with the natural mangrove wetlands,the restoration of artificial mangrove increased the soil nitrogen and phosphorus contents,and its carbon content of soil also returned to the level in the natural mangrove wetlands.(2)Among different wetland types,the carbon and phosphorus storage of soil in the aquaculture tidal flats were the highest.Compared with the natural mangrove wetland,the restoration of artificial mangrove increased the soil nitrogen and phosphorus storage.(3)The ratio of carbon,nitrogen and phosphorus in soil among different wetland types generally followed the pattern:carbon-phosphorus ratio>carbon-nitrogen ratio>nitrogen-phosphorous ratio.The carbon-nitrogen ratio of soil was the highest in the aquaculture tidal flats,followed by the natural mangroves and artificial mangroves.The carbon-phosphorus ratio and nitrogen-phosphorous ratio of soil were the highest in the natural mangroves,followed by the artificial mangroves and aquaculture tidal flats.The studies have shown that with the restoration of mangroves,their ecological functions have gradually returned to the level of natural mangroves,but their carbon storage was not much better than that of aquaculture tidal flats.In the future,the longer time-scale observation and research should be carried out to clarify the process and mechanism of mangrove restoration in regulating the soil carbon and nutrient dynamics.