不同形态氮输入对黄河三角洲芦苇湿地土壤有机碳矿化的影响  

Effects of Nitrogen Forms on the Decomposition of Soil Organic Carbon in the Reed(Phragmites australis) Wetlands of the Yellow River Delta

作　　者：刘晨阳 陶宝先[1] 董杰[1] 张保华[1] LIU Chen-yang;TAO Bao-xian;DONG Jie;ZHANG Bao-hua(College of Environment and Planning,Liaocheng University,Liaocheng 252059,China)

机构地区：[1]聊城大学环境与规划学院

出　　处：《滨州学院学报》2019年第2期57-66,共10页Journal of Binzhou University

基　　金：国家自然科学基金资助项目(41501099);山东省自然科学基金资助项目(ZR2016DM14);山东省本科高校教学改革研究项目(M2018X052);山东省黄河三角洲生态环境重点实验室开放基金资助项目(2081KFJJ04);聊城大学基金资助项目(318051430);聊城大学实验技术研究基金资助项目(26322170123)

摘　　要：氮沉降是影响土壤有机碳矿化的重要因素,而不同形态氮素对有机碳矿化的影响仍不清楚。为探讨不同形态氮输入对湿地土壤有机碳矿化的影响,以黄河三角洲芦苇湿地为例,通过室内培养,研究硝态氮、铵态氮和有机氮输入对土壤有机碳矿化的影响。每种氮输入类型设置对照、低、中、高4个氮输入梯度。结果表明:(1)无机氮(硝态氮和铵态氮)输入抑制表层(0~ 20 cm )土壤有机碳矿化( p <0.05),降幅为8.84%~25.63%,对中层(20~60 cm)土壤有机碳矿化无显著影响;硝态氮输入促进下层(60~80 cm)土壤有机碳矿化,增幅为23.24%~32.75%,对底层土壤(80~100 cm)有机碳矿化无显著影响;铵态氮输入促进60~100 cm深度土壤有机碳矿化,增幅为46.42%~109.7%。(2)有机氮输入抑制表层(0~20 cm)土壤有机碳矿化( p < 0.05 ),降幅为11.33%~25.93%;对20~40 cm深度土壤有机碳矿化无显著作用,对其他土层土壤有机碳矿化主要为促进作用,增幅为26.77%~231.64%。综上,硝态氮、铵态氮输入对0~100 cm深度土壤有机碳矿化无显著影响,而有机氮输入则促进0~100 cm深度土壤有机碳矿化,且有机氮输入的促进作用大于无机氮( p <0.05)。因此,有机氮输入将显著削弱研究区芦苇湿地土壤有机碳库的稳定性。Nitrogen (N) deposition is an important factor influencing the decomposition of soil organic carbon (SOC).However,little information is known about the effect of N forms on SOC decomposition.The aim of this study is to distinguish the effects of organic and inorganic N additions on SOC decomposition.An incubation experiment is conducted and the soil samples are collected from the reed ( Phragmites australis ) wetlands in the Yellow River Delta.The level of N additions is set.The results show that,(1) nitrate and ammonium additions suppressed SOC decomposition by 8.84%~25.63% in the depth of 0~20 cm,and have no effect on SOC decomposition in the depth of 20~60 cm.Nitrate addition increased SOC decomposition by 23.24%~32.75% in the depth of 60~80 cm,and had no effect on SOC decomposition in the depth of 80~100 cm.Ammonium accelerated SOC decomposition by 46.42%~ 109.7% in the depth of 60~100 cm.And (2) organic N addition decreased SOC decomposition by 11.33%~25.93% in the depth of 0~20 cm,and had no effect on SOC decomposition in the depth of 20~ 40 cm ,and increased SOC decomposition by 26.77%~231.64% in the depth of 40~100 cm.In general,nitrate and ammonium additions have no effect on SOC decomposition in the depth of 0~100 cm,and organic N addition accelerated SOC decomposition in the depth of 0~100 cm.Moreover,the positive effect of organic N addition on SOC decomposition is larger than that of inorganic N addition.Thus,organic N addition will reduce the stability of SOC pools in the reed wetlands of the Yellow River Delta.

关 键 词：无机氮 有机氮 土壤有机碳 滨海湿地 黄河三角洲 

分 类 号：S153[农业科学—土壤学]