• 关键词：有机碳矿化  土壤理化性质  氮、硫输入  潮汐湿地  闽江河口

• 基金项目：国家自然科学基金（No.41371127）；福建省科技计划重点项目（No.2014R1034-1）；福建师范大学亚热带河口生物地球化学创新团队项目（No.IRTL1205）；福建师范大学地理科学学院研究生创新基金项目

• 胡敏杰
• 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, 亚热带湿地研究中心, 地理科学学院, 福州 350007

• 邹芳芳
• 福建农林大学安溪茶学院, 福州 350002

• 仝川
• 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, 亚热带湿地研究中心, 地理科学学院, 福州 350007

• 任鹏
• 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, 亚热带湿地研究中心, 地理科学学院, 福州 350007

• 黄佳芳
• 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, 亚热带湿地研究中心, 地理科学学院, 福州 350007

• 李冬冬
• 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, 亚热带湿地研究中心, 地理科学学院, 福州 350007

• 摘要：通过室内培养实验，研究了氮、硫输入对闽江河口湿地土壤有机碳矿化和土壤理化性质的影响.结果表明：NH₄Cl（N1）、NH₄NO₃（N3）、K₂SO₄（S）和NH₄Cl+K₂SO₄（NS1）处理显著促进了湿地土壤有机碳矿化速率（p<0.05），较对照分别提高了76.57%、60.09%、83.20%和52.59%，并且不同处理下土壤有机碳矿化速率均表现为随培养时间的增加而递减.氮、硫输入在不同时间对湿地土壤有机碳矿化的影响不尽一致，在前6 d各处理的促进作用最明显.湿地土壤有机碳累积矿化量在不同处理下均表现为随培养时间逐渐增加，其增长速率在培养初始阶段较快，而后逐渐减慢；不同培养时间有机碳累积矿化量在N1、N3、S和NS1处理下与对照处理间均存在显著差异（p<0.05）.短期培养结束后，N3、NS1处理显著增加了湿地土壤DOC含量（p<0.05）；N1、N3、NS1和NH₄NO₃+K₂SO₄（NS3）处理均显著增加了土壤NH₄⁺-N含量（p<0.05）；KNO₃（N2）、N3、NS2和NS3处理均显著增加了土壤NO₃^--N含量（p<0.05）；S、NS1、NS2和NS3处理均显著增加了土壤SO₄^2-含量（p<0.05）.不同处理下湿地土壤Cl^-、pH、EC具有微弱的波动变化特征，但在不同处理组间均不存在显著差异（p>0.05）.多元回归分析显示，DOC、NH₄⁺-N和SO₄^2-是氮、硫输入处理下影响闽江河口湿地土壤有机碳矿化速率的主要控制因素.

• Abstract：Using laboratory incubation experiment techniques, the short-term effects of nitrogen and sulfate input on the mineralization of soil organic carbon from the tidal Cyperus malaccensis wetlands were measured in July 2015. Soil physical and chemical properties controlling the variation of soil organic carbon mineralization in Min River estuary were examined. The results showed that under aerobic conditions, the mineralization rates of soil organic carbon significantly increased by 76.57%, 60.09%, 83.20% and 52.59% in NH₄Cl, NH₄NO₃, K₂SO₄ and NH₄Cl plus K₂SO₄ treatments, respectively (p<0.05). During the incubation period, the daily mineralization rates of soil organic carbon decreased with increasing incubation time in different nitrogen and sulfate treatments. The influences of nitrogen and sulfate addition on the mineralization rates of soil organic carbon were different in different time scales, and the mineralization rates of soil organic carbon under all treatments were promoted obviously at the first six days of incubation. The cumulative mineralization of soil organic carbon increased with increasing incubation time under different nitrogen and sulfate treatments, and the increasing rate gradually declined with increasing incubation time. After the short-term incubation, dissolved organic carbon (DOC) contents of wetland soil significantly increased by NH₄NO₃ and NH₄Cl plus K₂SO₄ treatments (p<0.05); NH₄⁺-N contents significantly increased by NH₄Cl, NH₄NO₃, NH₄Cl plus K₂SO₄, and NH₄NO₃ plus K₂SO₄ treatments (p<0.05); NO₃^--N contents significantly increased by KNO₃, NH₄NO₃, KNO₃ plus K₂SO₄, and NH₄NO₃ plus K₂SO₄ treatments (p<0.05); SO₄^2- contents significantly increased by K₂SO₄, NH₄Cl plus K₂SO₄, KNO₃ plus K₂SO₄ and NH₄NO₃ plus K₂SO₄ treatments (p<0.05). The fluctuation characteristics were found in Cl^-, pH and EC contents under all treatments, but no statistically significant differences were found. Stepwise regression analysis showed that DOC, NH₄⁺-N, and SO₄^2- contents after incubation were the main driving factors affecting soil organic carbon mineralization rates in the Min River estuary tidal wetlands.

• Key words：organic carbon mineralization  soil properties  nitrogen and sulfate enrichment  tidal wetlands soil  Min River estuary

• 
  摘要点击次数： 1775 全文下载次数： 2319