• 关键词：氮  植物-土壤系统  空间扩展  湿地  闽江河口

• 基金项目：国家自然科学基金面上项目（No.41971128）；福建省“闽江学者奖励计划”项目

• 师自香
• 福建师范大学湿润亚热带生态地理过程教育部重点实验室，福州 350007;福建师范大学地理研究所，福州 350007

• 孙志高
• 福建师范大学湿润亚热带生态地理过程教育部重点实验室，福州 350007;福建师范大学地理研究所，福州 350007;福建师范大学福建省亚热带资源与环境重点实验室，福州 350007

• 胡星云
• 福建师范大学湿润亚热带生态地理过程教育部重点实验室，福州 350007;福建师范大学地理研究所，福州 350007

• 陈冰冰
• 福建师范大学湿润亚热带生态地理过程教育部重点实验室，福州 350007;福建师范大学地理研究所，福州 350007

• 李亚瑾
• 福建师范大学湿润亚热带生态地理过程教育部重点实验室，福州 350007;福建师范大学地理研究所，福州 350007

• 厉彦哲
• 福建师范大学湿润亚热带生态地理过程教育部重点实验室，福州 350007;福建师范大学地理研究所，福州 350007

• 王晓颖
• 福建师范大学湿润亚热带生态地理过程教育部重点实验室，福州 350007;福建师范大学地理研究所，福州 350007

• 摘要：选取闽江河口鳝鱼滩芦苇湿地、短叶茳芏湿地及二者空间扩展过程中形成的交错带湿地为研究对象，探讨了空间扩展影响下湿地植物-土壤系统氮分布、转运特征及其影响因素.结果表明，空间扩展影响下交错带湿地土壤氮含量发生了较大改变，其全氮（TN）、铵态氮（NH₄⁺-N）含量相比芦苇湿地分别降低了15.52%和6.08%，但相比短叶茳芏湿地分别增加了20.61%和4.33%；其硝态氮（NO₃^--N）含量相比芦苇湿地及短叶茳芏湿地分别降低了5.79%和13.84%.空间扩展主要通过改变植物生态特征、土壤EC及其颗粒组成而对湿地土壤氮的空间分布产生影响.空间扩展影响下湿地植物不同器官的TN含量亦发生了明显变化.相对于空间扩展前的纯群落，空间扩展后交错带芦苇和交错带短叶茳芏各器官的TN含量均明显增加；同时，在空间扩展后的交错带群落中，短叶茳芏各器官的TN含量均高于芦苇，前者主要与交错带植被对悬浮颗粒物拦截作用增强从而导致更多养分输入有关，后者主要与交错带短叶茳芏和芦苇对氮养分吸收与转运能力的差异有关.研究发现，相较于 短叶茳芏，空间扩展过程中的芦苇无论在氮养分吸收利用还是在向地上转运氮养分方面均处于明显优势，而这可能是导致短叶茳芏生态空间逐步被芦苇占据的一个重要因素.

• Abstract：To investigate the distribution and transfer of nitrogen （N） in plant-soil system of marshes in Shanyutan of the Min River estuary and explore its influencing factors， the Phragmites australis marsh （PAM）， Cyperus malaccensi marsh （CMM） and ecotone marsh （EM， P australis and C malaccensis in EM were denoted by PA' and CM'， respectively） in the process of their spatial expansion were studied. The results showed， as affected by spatial expansion， the contents of total nitrogen （TN）， ammonia nitrogen （NH₄^--N） and nitrate nitrogen （NO₃^--N） in soils of EM showed great changes. Compared with PAM， the TN and NH₄^--N contents in soils of EM decreased by 15.52% and 6.08%， respectively. However， both TN and NH₄^--N contents in soils of EM showed increasing trend compared to CMM and the values increased by 20.61% and 4.33%， respectively. Moreover， compared with PAM and CMM， the contents of NO₃^--N in soils of EM also showed increasing trend and the values increased by 5.79% and 13.84%， respectively. The spatial distributions of N in soils of EM might be attributed to the alterations of plant ecological traits， soil EC and grain composition. As affected by spatial expansion， the TN contents in organs of different plants also showed great variations. After spatial expansion， the TN contents in organs of PA and CM increased significantly and， in EM， the values in organ of CM' were much higher than those of PA'， which was mainly depended on the nutrient input caused by the strong interception for suspended particulate matter by plants and the differences in nutrient absorption and transfer by plants in EM. This paper found that no matter in N absorption and utilization or in N transfer from roots to the aboveground parts， the PA showed distinct advantage during spatial expansion， and this was a very important reason inducing the ecological space of CM was gradually occupied by PA.

• Key words：nitrogen  plant-soil system  spatial expansion  marsh  Min River estuary

• 
  摘要点击次数： 213 全文下载次数： 253