黄河口不同恢复阶段湿地土壤N2O产生过程对氮输入的响应

doi:10.13287/j.1001-9332.201604.030

应用生态学报 ›› 2016, Vol. 27 ›› Issue (4): 1135-1144.doi: 10.13287/j.1001-9332.201604.030

黄河口不同恢复阶段湿地土壤N₂O产生过程对氮输入的响应

孙志高^1*,孙文广²

¹福建师范大学地理研究所/湿润亚热带生态地理过程教育部重点实验室, 福州 350007;
²路易斯安那州立大学植物、环境与土壤科学系, 巴图鲁日 70803

收稿日期:2015-08-13 修回日期:2016-01-25 出版日期:2016-04-22 发布日期:2016-04-22
通讯作者: zhigaosun@163.com
作者简介:孙志高, 男, 1979年生,博士,研究员,博士生导师. 主要从事河口湿地生物地球化学过程研究. E-mail: zhigaosun@163.com
基金资助:
本文由国家自然基金面上项目(41371104, 41171424)、福建省“闽江学者奖励计划”项目和福建省高等学校“新世纪优秀人才计划”项目资助

Effects of exogenous nitrogen on N₂O production processes in wetland soils of different restoration phases in the Yellow River estuary.

SUN Zhi-gao^1*, SUN Wen-guang²

¹Institute of Geo-graphy/Ministry of Education Key Laboratory of Humid Subtropical Eco-geographical Process, Fujian Normal University, Fuzhou 350007, China;
²School of Plant, Environment and Soil Science, Louisiana State University, Baton Rouge 70803, USA

Received:2015-08-13 Revised:2016-01-25 Online:2016-04-22 Published:2016-04-22
Supported by:
This work was supported by the National Natural Science Foundation of China (41371104, 41171424), the Award Program for Minjiang River Scholar in Fujian Province and the Program for New Century Excellent Talents in Fujian Province Universities.

摘要/Abstract

摘要： 以黄河口生态恢复前后未恢复区(R₀)、2007年恢复区(R₂₀₀₇)和2002年恢复区(R₂₀₀₂)的芦苇湿地为研究对象,研究了不同形态氮输入对湿地土壤N₂O产生过程的影响与贡献.结果表明: 硝态氮(NO₃^--N)输入对恢复区湿地土壤N₂O总产生量的影响远远大于铵态氮(NH₄⁺-N),但两者均抑制了R₀土壤的N₂O总产生量.尽管NO₃^--N输入对R₂₀₀₂表层土壤N₂O总产生量的影响明显大于R₂₀₀₇,但二者的N₂O产生量均随氮输入量的增加而增加.恢复区湿地土壤的反硝化作用和硝化细菌反硝化作用受NO₃^--N输入的影响明显,而R₀土壤产生N₂O的生物过程受其影响并不显著.尽管NH₄⁺-N输入对湿地土壤N₂O的总产生量影响不大,但其输入整体促进了R₀土壤的硝化细菌反硝化作用、R₂₀₀₇土壤的硝化作用和R₂₀₀₂土壤的非生物作用.比较而言,NO₃^--N输入对R₀、R₂₀₀₇和R₂₀₀₂湿地土壤N₂O产生的非生物作用主要表现为抑制,NH₄⁺-N输入则整体提高了R₀和R₂₀₀₂湿地土壤非生物作用的N₂O产生量,这与不同形态氮输入对土壤pH的调节作用密切相关.研究发现,NO₃^--N输入大大增加了湿地土壤的N₂O总产生量,改变了原有湿地土壤生物作用和非生物作用的贡献模式,故生态恢复工程导致的营养盐输入(NO₃^--N)应受到特别关注.

Abstract: The effects of exogenous nitrogen on N₂O production processes in the soils of un-restoration wetland (R₀), restoration wetland since 2007 (R₂₀₀₇) and restoration wetland since 2002 (R₂₀₀₂) of the Yellow River estuary were studied, and the contributions of different processes in N₂O production were determined. Results showed that the N₂O production of restoration wetland soils (R₂₀₀₂ and R₂₀₀₇) with NO₃^--N addition was much higher than that with NH₄⁺-N addition, but both NH₄⁺-N and NO₃^--N additions demonstrated inhibition on the N₂O production of soils in R₀. Although the effect of NO₃^--N addition on the total N₂O production of topsoil in R₂₀₀₂ was significantly higher than those in R₂₀₀₇, the values in R₂₀₀₂ and R₂₀₀₇were greatly increased with increasing NO₃^--N addition. The denitrification and nitrifier denitrification processes in restoration wetland soils (R₂₀₀₂ and R₂₀₀₇) were greatly affected by NO₃^--N addition, but no significant influence on the non-biological processes of soil in R₀ was observed. Although NH₄⁺-N addition did not produce significant effects on the total N₂O production of wetland soils, the nitrifier denitrification process in R₀ soil, the nitrification process in R₂₀₀₇ soil and the non-biological process in R₂₀₀₂ soil were generally stimulated. In R₀ and R₂₀₀₂ soils, the N₂O produced by non-biological processes was generally eleva-ted with NH₄⁺-N addition, while with NO₃^--N addition, the non-biological processes generating N₂O in R₀, R₂₀₀₂ and R₂₀₀₇ soils were generallyinhibited, which was closely correlated with the regulation of soil pH caused by the import of exogenous nitrogen. This study found that the enrichment of NO₃^--N greatly enhanced the total N₂O production of wetland soils and significantly altered the original contribution patterns of biological and non-biological processes to N₂O production. Thus, special attention should be paid on the influences of nutrient import (particularly NO₃^--N enrichment) induced by ecological restoration project on N₂O production of wetland soils.

孙志高,孙文广. 黄河口不同恢复阶段湿地土壤N₂O产生过程对氮输入的响应[J]. 应用生态学报, 2016, 27(4): 1135-1144.

SUN Zhi-gao, SUN Wen-guang. Effects of exogenous nitrogen on N₂O production processes in wetland soils of different restoration phases in the Yellow River estuary.[J]. Chinese Journal of Applied Ecology, 2016, 27(4): 1135-1144.

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黄河口不同恢复阶段湿地土壤N₂O产生过程对氮输入的响应

Effects of exogenous nitrogen on N₂O production processes in wetland soils of different restoration phases in the Yellow River estuary.

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