东寨港不同植物群落土壤微生物量碳氮及养分特征

Soil Microbial Biomass Carbon,Nitrogen and Nutrient Characteristics of Different Plant Communities in Dongzhai Port

对海南东寨港红树林不同植物群落的土壤理化性质、土壤微生物量生物量碳氮及养分含量进行分析。结果表明:1)土壤微生物生物量碳(MBC)和土壤微生物生物量氮(MBN)变化范围分别为135.83~1171.24 mg/kg和35.13~232.89 mg/kg,不同植物群落间MBC和MBN含量变化规律基本一致且均存在显著差异,其中白骨壤和红海榄群落土壤MBC和MBN含量最低;2)东寨港红树林湿地土壤TC∶TN∶TP均值为76∶4∶1,土壤微生物生物量MBC∶MBN均值为5∶1,不同位置不同树种组成的群落土壤养分和微生物生物量碳氮及其化学计量比存在显著差异;3)相关性分析表明,东寨港红树林湿地土壤微生物生物量碳氮与土壤养分存在紧密关系,能作为该区土壤碳氮变化的早期生物指示指标。

This paper conducted the analysis of soil physical and chemical properties,soil microbial biomass,carbon and nitrogen,and nutrient content of different mangrove plant communities in Dongzhai Port.The results showed that:1)The variation ranges of soil microbial biomass carbon and nitrogen(MBC and MBN)were 135.83-1171.24 mg/kg and 35.13-232.89 mg/kg,respectively.The variation laws of MBC and MBN contents among different plant communities were basically the same and there were significant differences.Among them,the soil MBC and MBN contents of Avicennia marina and Rhizophora stylosa communities were the lowest.2)The average soil TC∶TN∶TP of Dongzhai Port was 76∶4∶1,average MBC∶MBN was 5∶1.There were significant differences in soil nutrients,microbial biomass carbon and nitrogen,and in their stoichiometric ratios among communities with different tree species at different locations.3)Correlation analysis showed that there was a close relationship between soil microbial biomass carbon and nitrogen and soil nutrients in Dongzhai Port mangrove wetland,which could be used as an early biological indicator of soil carbon and nitrogen change in this area.