摘要
在湿地生态系统氮循环过程中,湿地土壤养分供给状况及可利用水平与氮素含量存在直接关系。以贵州草海湿地自然演替下植物群落表层土壤氮素含量作为研究对象,探讨4种典型湿地植物群落(牛筋草、李氏禾、香薷和芦苇)土壤中硝态氮、铵态氮、速效氮和总氮含量以及不同土壤团聚体粒径下湿地土壤氮素的空间分布特征。结果表明:①各植物群落土壤阳离子交换量与总氮含量分布趋势基本一致,其中芦苇群落土壤中阳离子交换量、速效氮和总氮含量最高;②各植物群落不同粒径土壤团聚体速效氮和总氮含量均无显著差异(p>0.05),芦苇群落土壤硝态氮含量在各粒径土壤团聚体中含量均低于其他植物群落,李氏禾群落土壤氨态氮含量在不同粒径土壤团聚体中存在显著差异(p<0.05)。植物群落表层土壤氮素含量分布受植物种类及自身凋落物、降雨量和地势、微生物活动和有机质等因素的影响,土壤硝化作用受到抑制或促进,各植物群落铵态氮和硝态氮含量分布有显著差异(p<0.05)。
In the process of nitrogen cycling in wetland ecosystem,there is a direct relationship between the supply and availability of wetland soil nutrients and nitrogen content.The nitrogen content which existing in the surface soil of the plant community under the natural succession of the Caohai Wetland in Guizhou Province was selected as the research object.The surface soil of four typical wetland plant communities(i.e.Goosegrass,Leesgrass,Elsholtzia and Phragmites)were collected,the content of nitrate nitrogen,ammonium nitrogen,available nitrogen and total nitrogen in four kinds of phytocoenosium as well as the spatial distribution characteristics of wetland soil nitrogen under different soil aggregate particle sizes were studied.The results show these as follows.The distribution trend of soil cation exchange capacity and total nitrogen content in each plant community was basically the same.The contents of cation exchange capacity,available nitrogen and total nitrogen in the soil of Phragmites communis were the highest.The contents of available nitrogen and total nitrogen in soil aggregates with different particle sizes in each plant community had no significant difference(p>0.05).In the Phragmites community,the contents of nitrate nitrogen in the soil aggregates with different size were the lowest.In the Leesgrass community,the contents of ammonium nitrogen in the soil aggregates with different sizes were significantly different(p<0.05).The distribution of nitrogen contents in the surface of the plant community was affected by plant species and its own litter,rainfall and topography,microbial activities and organic matte et al.factors.As a result,soil nitrification was inhibited or promoted,and the final manifestation was that the distribution of ammonium nitrogen and nitrate nitrogen in each plant community was significantly different(p<0.05).
作者
王硕
吴云杰
张明意
潘青春
田鑫
苏春花
WANG Shuo;WU Yun-jie;ZHANG Ming-yi;PAN Qing-chun;TIAN Xin;SU Chun-hua(School of Eco-Environmental Engineering,Guizhou Minzu University,Guiyang 550025,China;Research Center for Karst Wetland Ecology,Guizhou Minzu University,Guiyang 550025,China)
出处
《科学技术与工程》
北大核心
2021年第35期14962-14968,共7页
Science Technology and Engineering
基金
国家自然科学基金(31860178)
贵州省科技计划项目([2018]1075)
贵州省大学生创新创业项目(2018520234)。
关键词
湿地
群落
氮素
团聚体
阳离子交换量
wetland
community
nitrogen
aggregates
cation exchange capacity
