引用本文:胡 容,叶 春,蒲玉琳,胡嗣佳,张世熔,向 双,贾永霞,徐小逊.若尔盖高寒沼泽湿地退化过程中土壤有机氮组分的演变特征[J].土壤学报,2019,56(6):1425-1435.
HU Rong,YE Chun,PU Yulin,HU Sijia,ZHANG Shirong,XIANG Shuang,JIA Yongxia,XU Xiaoxun.Evolution of Soil Organic Nitrogen Composition with Degradation of Zoige Alpine Marsh Wetland[J].Acta Pedologica Sinica,2019,56(6):1425-1435
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若尔盖高寒沼泽湿地退化过程中土壤有机氮组分的演变特征
胡 容1, 叶 春1, 蒲玉琳1, 胡嗣佳1, 张世熔2, 向 双3, 贾永霞1, 徐小逊2
1.四川农业大学资源学院;2.四川农业大学环境学院;3.中国科学院山地生态恢复与生物资源利用重点实验室,生态恢复与生物多样性保育四川省重点实验室,中国科学院成都生物研究所
摘要:
为明确湿地退化过程中土壤有机氮组分的变化及其生物有效性,采用实地采样调查、室内分析与数理统计法,研究若尔盖自然湿地保护区内相对原生沼泽(RPM)向轻度退化沼泽(LDM)、中度退化沼泽(MDM)、重度退化沼泽(HDM)退化过程中土壤有机氮组分的演变特征及与有效氮的耦合关系。结果表明,当沼泽发生中度、重度退化时,土壤全氮(TN)含量分别降低33.4%~77.8%、69.4%~93.7%(P<0.05),碱解氮(AN)含量分别降低36.8%~80.2%、57.6%~82.2%(P<0.05)。4类湿地土壤的酸解氨态氮、氨基酸态氮、未知态氮含量均按RPM、LDM、MDM、HDM的顺序降低。与RPM相比,HDM土壤酸解氨态氮与未知态氮含量分别降低66.3%~70.8%、62.2%~78.4%(P<0.05),MDM和HDM土壤氨基酸态氮含量分别降低47.2%~68.6%、85.7%~86.7%(P<0.05)。氨基糖态氮含量随着湿地退化先升高后降低。随着湿地退化程度的加剧,氨基糖态氮与酸解氨态氮占全氮的比例上升,而氨基酸态氮的比例下降。酸解氨态氮和未知态氮分别是影响RPM和HDM土壤碱解氮含量的主要有机氮组分,LDM与MDM土壤碱解氮含量却主要受有机氮组分中氨基酸态的控制。若尔盖湿地退化降低了土壤全氮及酸解组分氮含量,减弱了土壤氮“汇”功能,改变了有机氮组分对氮素有效性的贡献。
关键词:  若尔盖  湿地退化  酸解组分氮  氮素积累  氮素有效性
DOI:10.11766/trxb201812240572
分类号:
基金项目:中国科学院开放基金( kxysws1606 )和国家自然科学基金项目( 41401328 )共同资助
Evolution of Soil Organic Nitrogen Composition with Degradation of Zoige Alpine Marsh Wetland
HU Rong1, YE Chun1, PU Yulin1, HU Sijia1, ZHANG Shirong2, XIANG Shuang3, JIA Yongxia1, XU Xiaoxun2
1.College of Resources, Sichuan Agricultural University;2.College of Environment, Sichuan Agricultural University;3.Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization, CAS & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences
Abstract:
【Objective】This study was oriented to characterize the evolution of organic nitrogen composition and bioavailabilities of its components with degradation of alpine wetlands, in an attempt to provide certain basic data for restoration of degraded alpine marsh wetlands. 【Method】Soil samples were collected from 4 types of wetlands, including relatively pristine marsh (RPM), lightly degraded marsh (LDM), moderately degraded marsh (MDM), and heavily degraded marsh (HDM) in the Zoige Wetland Nature Reserve. Organic nitrogen in the soil samples were fractionated using the Bremner method. Multivariate stepwise regression analysis was performed to determine contribution of each fraction of organic nitrogen to availability of soil nitrogen.【Result】With RPM turning into MDM and HDM, soil total nitrogen (TN) decreased significantly or by 33.4%~77.8% and 69.4%~93.7%, respectively, and alkalytic nitrogen (AN) by 36.8%~80.2% and 57.6%~82.2%, respectively, in content. In terms of contents of acidolytic ammonia nitrogen, amino acid nitrogen and unknown nitrogen, the four types of wetlands exhibited an order of RPM > LDM > MDM > HDM. With a marsh degrading, amino sugar nitrogen therein increased first and then decreased in content, and the proportion of amino sugar nitrogen and ammonia nitrogen to TN increased, while that of amino acid nitrogen to TN decreased. The main organic nitrogen fraction affecting the content of soil available nitrogen in RPM and HDM was ammonia nitrogen and unknown nitrogen, respectively; whereas that in LDM and MDM was amino acid nitrogen. 【Conclusion】 Degradation of the Zoige Alpine Wetland reduced the contents of soil TN and the fraction of acidolytic nitrogen, weakened nitrogen "sink" function of the soil, and changed the contribution of each organic nitrogen fraction to nitrogen availability.
Key words:  Zoige  Wetland degradation  Organic nitrogen fractions  Nitrogen accumulation  Nitrogen availability