Hu Min-Jie, Ren Peng, Huang Jia-Fang, Tong Chuan
Research Centre of Wetlands in Subtropical Region, Key Laboratory of Humid Sub-tropical Eco-geographical Process of the Ministry of Education, School of Geographical Sciences, Fujian Normal Universities, Fuzhou 350007, China.
Huan Jing Ke Xue. 2016 Sep 8;37(9):3606-3615. doi: 10.13227/j.hjkx.2016.09.044.
In April 2015, using enclosed static opaque chamber-GC techniques, the short-term effects of nitrogen and sulfate addition on the CH and CO emissions were measured in the marsh in the high tidal flat of the Minjiang River estuary, and the key factors controlling the variation of CH and CO were examined. The influences of nitrogen and sulfate addition on the CH and CO emissions were different in different time scales. CH emission increased significantly under the NHCl (NH) and NHNO+KSO (NS) additions (<0.01), COemission increased significantly with NS addition (<0.05), but CH and CO emissions demonstrated an obvious fluctuation pattern with KNO (NO) and KSO(S) additions. Compared with the control (CK), average CH emissions increased by 286.36% and 122.73%, respectively, in the NH and NS addition treatments, average CO emissions increased by 39.92% and 34.24%, respectively, with the NH and NS additions treatments. The nitrogen and sulfate addition changed the temporal variation of CH and COemissions from the wetlands in growing season. Significant correlations were found among CO, CH emissions, and soil temperature, electrical conductivity (EC), DOC (dissolved organic carbon) and NH-N (<0.05 or <0.01) in the treatments with NH and NS additions; and soil temperature, EC, DOC and NO-N (<0.05 or <0.01) in the treatments with NO and NS additions. Temperature, EC and nitrogen availability were the dominant factors controlling the temporal variations of CH and COemissions in estuarine tidal marsh ecosystem.
2015年4月，采用封闭式静态不透明箱-气相色谱技术，在闽江河口高潮滩湿地测定了添加氮和硫酸盐对CH和CO排放的短期影响，并研究了控制CH和CO变化的关键因素。添加氮和硫酸盐对CH和CO排放在不同时间尺度上的影响不同。添加NH₄Cl（NH）和NH₄NO₃+K₂SO₄（NS）后CH排放显著增加（P<0.01），添加NS后CO排放显著增加（P<0.05），但添加KNO₃（NO）和K₂SO₄（S）后CH和CO排放呈现明显的波动模式。与对照（CK）相比，NH和NS添加处理中平均CH排放分别增加了286.36%和122.73%；NH和NS添加处理中平均CO排放分别增加了39.92%和34.24%。添加氮和硫酸盐改变了生长季湿地CH和CO排放的时间变化。在添加NH和NS的处理中，CO、CH排放与土壤温度、电导率（EC）、溶解有机碳（DOC）和NH₄⁺-N之间存在显著相关性（P<0.05或P<0.01）；在添加NO和S的处理中，与土壤温度、EC、DOC和NO₃⁻-N之间存在显著相关性（P<0.05或P<0.01）。温度、EC和氮有效性是控制河口潮汐沼泽生态系统中CH和CO排放时间变化的主导因素。
