水淹频率增加对闽江河口湿地土壤硝化作用的影响  

Effects of Increasing Flooded Frequency on Soil Nitrification in the Min River Estuarine Wetlands

作　　者：陈美田[1] 章文龙[1,2] 高灯州 曾从盛[1,2,3] 

机构地区：[1]福建师范大学地理科学学院,福州350018 [2]湿润亚热带生态地理过程教育部重点实验室,福州350007 [3]福建师范大学亚热带湿地研究中心,福州350007

出　　处：《亚热带资源与环境学报》2016年第4期23-28,共6页Journal of Subtropical Resources and Environment

基　　金：国家基础科学人才培养基金(J1210067);福建师范大学大学生省级创新创业训练计划项目(201410394067)

摘　　要：研究河口湿地土壤硝化作用对水淹频率的响应,对于认识海平面上升背景下湿地土壤氮素循环具有重要意义。选取闽江河口湿地为研究区,通过测定区内6、7和8月高潮滩(偶尔水淹)和中潮滩(频繁水淹)表层土壤的硝化速率,并进一步通过原位培养实验,探讨水淹频率增加对土壤硝化作用的影响。结果表明:1)观测期内,偶尔水淹样地土壤硝化速率的平均值(8.02、2.82和4.28 nmol·g^(-1)·h^(-1))均小于频繁水淹样地土壤硝化速率的平均值(10.54、7.41和14.82 nmol·g^(-1)·h^(-1)),差异显著。2)原位培养实验表明,除了培养初期(30 d)外,水淹频率增加(从4.15%增加到37.11%)显著促进了土壤硝化作用,培养60 d和90 d后,硝化速率高出的比例分别为241%和121%。3)频繁水淹样地土壤pH、有机碳、全氮和全磷分别显著高于偶尔水淹样地的相应值。Studying estuarine wetlands＇ soil nitrification is useful to understanding wetlands＇ soil ni- trogen cycle in the context of sea level rise. A field study was carried out in the Min River estuarine wetlands, and the soil nitrification were determined in high tidal flat （ occasionally flooded） and middle tidal flat （frequently flooded）. Moreover, effects of increasing flooded frequency on soil nitrification were analyzed by incubation method in situ. The result indicated that： 1 ） In the observation period, the soil nitrification rate are respectively 8. 02 nmol ·g- 1 . h - i, 2. 82 nmol · g - 1 · h - 1 , 4. 28 nmol · -1 -1 g · h , lower than those of frequently flooded area （10.54, 7.41 and 14. 82 nmol- g-1 . h-l）; 2） The field trial show that, except for the culture stage （30 d） , there was apparently as 241% and 121% increase in the soil nitrification rate after 60 d and 90 d, with increasing flooded frequency （in-creased from 4. 15% to 37. 11% ） ; 3） The pH, SOC, TN and TP in frequently flooded area is evi- dently higher than in the occasionally flooded area.

关 键 词：水淹频率 硝化作用 湿地土壤 闽江河口 

分 类 号：S151.9[农业科学—土壤学]