Characteristics and Temperature Effect of Soil Nitrogen Mineralization from Alpine Marsh Wetlands with Different Degradation Degree in Zoige

doi:10.11733/j.issn.1007-0435.2021.05.019

Acta Agrestia Sinica ›› 2021, Vol. 29 ›› Issue (5): 1025-1033.DOI: 10.11733/j.issn.1007-0435.2021.05.019

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Characteristics and Temperature Effect of Soil Nitrogen Mineralization from Alpine Marsh Wetlands with Different Degradation Degree in Zoige

LI Meng¹, HU Rong², PU Yu-lin¹, ZHANG Shi-rong³, LI Ting¹, JIA Yong-xia¹, LI Yun¹

1. College of Resources Science, Sichuan Agricultural University, Chengdu, Sichuan Province 611130, China;
2. Wulong Agricultural and Rural Committee, Chongqing 408500, China;
3. College of Environment Sciences, Sichuan Agricultural University, Chengdu, Sichuan Province 611130, China

Received:2020-11-14 Revised:2021-01-04 Online:2021-05-15 Published:2021-06-02

若尔盖不同退化程度高寒沼泽湿地土壤氮矿化特征及温度效应

李梦¹, 胡容², 蒲玉琳¹, 张世熔³, 李婷¹, 贾永霞¹, 李云¹

1. 四川农业大学资源学院, 四川成都 611130;
2. 重庆武隆区农业农村委员会, 重庆 408500;
3. 四川农业大学环境学院, 四川成都 611130

通讯作者: 蒲玉琳,E-mail:pyulin@sicau.edu.cn
作者简介:李梦(1994-)，女，汉族，新疆伊宁人，硕士研究生，主要从事土壤碳氮养分循环研究，E-mail：limeng5156@163.com
基金资助:
国家自然科学基金项目（41401328）；中国科学院开放基金（kxysws1606）资助

Abstract

Abstract: Clarifying soil nitrogen mineralization and its response to climate warming is of great significance for ecological restoration in degraded alpine marsh wetlands. During the degradation from relative pristine marshes (RPM) to lightly degraded marsh (LDM),moderately degraded marsh (MDM) and heavily degraded marsh (HDM),the characteristics and the effects of temperature on soil nitrogen mineralization were studied using waterlogged incubation method. The results showed that the accumulations of ammonium nitrogen,ammonification rate and nitrogen mineralization potential among different marshes with different degradation degree ranked in the following order:MDM>RPM>LDM>HDM. Compared with RPM,the rate of soil mineralization nitrogen (ammonification rate) slowed down at 5~15℃,while accelerated at 20~25℃ in degraded marshes. The accumulations of ammonium nitrogen and ammonification rate increased with the increase of temperature in each wetland soil. However,the temperature sensitivity of soil ammonification was reduced by marsh degradation,and it was significantly higher in HDM than that in LDM and MDM. Therefore,when the mean monthly temperature was lower than 15℃ for years in Zoige,the degradation of alpine marsh wetlands reduced soil ammonification rate,nitrogen supply potentiality,the temperature sensitivity of ammonification and the availability of soil nitrogen.

Key words: Zoige, Marsh degradation, Accumulation of ammonium nitrogen, Ammonification rate, Temperature effect

摘要： 为明晰退化高寒沼泽湿地土壤氮矿化及其对气候变暖的响应，本研究采用淹水培养法研究相对原生沼泽（RPM）向轻度退化沼泽（LDM）、中度退化沼泽（MDM）、重度退化沼泽（HDM）退化过程中土壤氮矿化特征及温度效应。结果表明：不同退化程度土壤铵态氮累积量、氨化速率和氮矿化势的大小都是MDM>RPM>LDM>HDM；退化沼泽土壤氨化速率相较于RPM在5~15℃时减慢，在20~25℃时加快；4种湿地土壤铵态氮累积量和氨化速率均随温度升高而增大；沼泽退化降低了氮矿化的温度敏感系数，且HDM显著高于LDM和MDM。因此，在若尔盖多年月均气温低于15℃的条件下，高寒沼泽湿地退化降低了土壤氨化速率、供氮潜力和氨化作用的温度敏感性，减小了土壤氮的可利用性。

关键词: 若尔盖, 沼泽退化, 铵态氮累积量, 氨化速率, 温度效应

CLC Number:

S812

LI Meng, HU Rong, PU Yu-lin, ZHANG Shi-rong, LI Ting, JIA Yong-xia, LI Yun. Characteristics and Temperature Effect of Soil Nitrogen Mineralization from Alpine Marsh Wetlands with Different Degradation Degree in Zoige[J]. Acta Agrestia Sinica, 2021, 29(5): 1025-1033.

李梦, 胡容, 蒲玉琳, 张世熔, 李婷, 贾永霞, 李云. 若尔盖不同退化程度高寒沼泽湿地土壤氮矿化特征及温度效应[J]. 草地学报, 2021, 29(5): 1025-1033.

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Characteristics and Temperature Effect of Soil Nitrogen Mineralization from Alpine Marsh Wetlands with Different Degradation Degree in Zoige

若尔盖不同退化程度高寒沼泽湿地土壤氮矿化特征及温度效应

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