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王雪,郭雪莲,郑荣波,王山峰,刘双圆,田伟.放牧对滇西北高原纳帕海沼泽化草甸湿地土壤氮转化的影响.生态学报,2018,38(7):2308~2314 本文二维码信息
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放牧对滇西北高原纳帕海沼泽化草甸湿地土壤氮转化的影响
Effects of grazing on nitrogen transformation in swamp meadow wetland soils in Napahai of Northwest Yunnan
投稿时间:2017-05-15  修订日期:2017-11-14
DOI: 10.5846/stxb201705150893
关键词纳帕海  放牧干扰  矿化作用  硝化作用  反硝化作用
Key WordsNapahai  grazing disturbance  mineralization  nitrification  denitrification
基金项目国家自然科学基金项目(41563008,41001332);云南纳帕海国际重要湿地2015年生态效益补偿试点项目
作者单位E-mail
王雪 西南林业大学国家高原湿地研究中心, 昆明 650224  
郭雪莲 西南林业大学国家高原湿地研究中心, 昆明 650224 guoxuelian2009@hotmail.com 
郑荣波 西南林业大学化学工程学院, 昆明 650224  
王山峰 西南林业大学国家高原湿地研究中心, 昆明 650224  
刘双圆 西南林业大学国家高原湿地研究中心, 昆明 650224  
田伟 云南香格里拉市纳帕海湿地管理局, 迪庆 674400  
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摘要:
选择位于滇西北高原纳帕海国际重要湿地内的典型沼泽化草甸湿地为研究对象,采用原位土柱室内控制实验法研究了放牧干扰(猪翻拱扰动和牲畜践踏)对沼泽化草甸湿地土壤氮转化的影响。研究结果表明,放牧活动显著提高了沼泽化草甸湿地表层土壤的容重和pH值,降低了土壤含水率、TOC、TN和NH4+-N含量,而对NO3--N含量影响不显著。放牧干扰下沼泽化草甸湿地土壤的矿化速率和硝化速率均表现为猪翻拱扰动样地(ZG) > 牲畜践踏样地(JT) > 对照样地(CK);表现为ZG > JT > CK。放牧干扰促进了沼泽化草甸湿地土壤的矿化和硝化作用,猪的翻拱活动比牲畜践踏活动对土壤氮矿化和硝化作用的促进作用更显著。放牧干扰下沼泽化草甸湿地土壤的反硝化速率表现为ZG > CK > JT,猪的翻拱活动促进了土壤N2O气体的排放,而牲畜践踏活动抑制了土壤N2O气体的排放。相关性分析表明,受放牧干扰的沼泽化草甸湿地土壤的矿化和硝化速率均与土壤容重、pH呈显著正相关,与土壤含水率、NH4+-N、TOC、TN含量呈显著负相关;反硝化速率与TOC含量呈显著负相关。
Abstract:
In this study, the typical swamp meadow wetland in Napahai, a Wetland of International Importance, in Northwest Yunnan was selected as the research site. Nitrogen transformations in swamp meadow wetland soils under the influence of grazing disturbance were measured and analyzed using in situ column interior control experiment methods. The results showed that the soil bulk density and pH were increased, and the soil moisture content, total organic carbon content, total nitrogen content, and NH4+-N content were decreased in surface soils with grazing disturbance. The mineralization and nitrification rates of swamp meadow wetland soils with the influence of grazing disturbance showed a significant decrease:pig arch > cattle-trampled > control. Both pig arch and cattle-trampled sites enhanced the mineralization and nitrification rates. Denitrification rates of swamp meadow wetland soils with the influence of grazing disturbance showed a significant decrease:pig arch > control > cattle-trampled (P < 0.05). Pig arch sites promoted N2O release but cattle-trampled sites inhibited N2O release. In contrast, both the mineralization and nitrification rates of swamp meadow wetland soils with the grazing disturbance had a significant positive correlation with soil bulk density and pH, and a significant negative correlation with soil moisture content, NH4+-N content, TOC, and TN. Denitrification rate had a significant negative correlation with TOC.
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