崇明东滩湿地不同植物群落下沉积物中CO2和N2O的释放动态研究

印杰; 汤逸帆; 崔洪磊; 韩建刚; 李萍萍

doi:10.3969/j.issn.1000-2006.2016.04.005

崇明东滩湿地不同植物群落下沉积物中CO₂和N₂O的释放动态研究

印杰,汤逸帆,崔洪磊,韩建刚,李萍萍

南京林业大学学报（自然科学版） ›› 2016, Vol. 40 ›› Issue (04) : 29-34.

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南京林业大学学报（自然科学版） ›› 2016, Vol. 40 ›› Issue (04) : 29-34. DOI: 10.3969/j.issn.1000-2006.2016.04.005

专题报道(Ⅱ)

崇明东滩湿地不同植物群落下沉积物中CO₂和N₂O的释放动态研究

印杰,汤逸帆,崔洪磊,韩建刚^*,李萍萍^*

作者信息 +

Emissions of CO₂ and N₂O in sediments with different vegetation types in Chongming Dongtan wetland

YIN Jie, TANG Yifan, CUI Honglei, HAN Jiangang^*, LI Pingping^*

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文章历史 +

摘要

湿地生态系统温室气体排放与植物群落之间的关系是近年来全球气候变化研究的热点。为揭示滨海湿地不同植物群落下沉积物中温室气体的释放规律,以崇明东滩为原型区域,采集光滩(无明显植物覆被)、互花米草、互花米草-芦苇共生及芦苇等4个采样带沉积物样品,观测CO₂和N₂O的释放特征。结果表明:互花米草、互花米草-芦苇、芦苇群落的沉积物中CO₂累积释放量(1 066～1 105 mg/kg)显著高于光滩((846±22)mg/kg),但3种植物群落之间并无显著差异(P<0.05)。结合CO₂累积释放量与沉积物中全氮含量(ω(TN))之间的显著正相关关系(P<0.05),可以认为,湿地沉积物全氮含量对CO₂释放的影响可能比植物群落大。相比较而言,芦苇群落下沉积物中N₂O累积释放量为(0.41±0.01)mg/kg,明显高于互花米草-芦苇群落的(0.32±0.01)mg/kg、互花米草群落的(0.23±0.01)mg/kg和光滩的(0.21±0.00)mg/kg。这表明,芦苇群落有利于沉积物中N₂O的产生或释放。未来对滨海湿地N₂O排放进行调控与评估过程中,芦苇及其生境的作用应当给予重点关注。

Abstract

The relationship of greenhouse gases emissions and vegetation types in wetlands is becoming a hotspot with global climate changes. The present study aims to characterize the emissions of greenhouse gases in sediments with different vegetations community in typical coastal wetlands. Sediment samples were collected from three vegetation communities of Phragmites australis, Spartina alterniflora, the intergrowth area of the two species and mudflat(no vegetation)in Chongming Dongtan wetland. The samples were incubated for 60 days and measured the releases of CO₂ and N₂O. The results showed that the total emissions of CO₂ in sediments under vegetations community(1 066-1 105 mg/kg)were much higher than those in mudflat((846±22)mg/kg)(P<0.05). No significant difference was found among 3 vegetation communities. Combined with the significant positive correlation between the total emissions of CO₂ and ω(TN)in sediments(P<0.05), the fact that can be deduced that ω(TN)in sediments rather than under the vegetation types community acts as a key role in control of CO₂ emissions from sediments. In contrast, the total emissions of N₂O in sediments with Ph. australis((0.41±0.01)mg/kg)were substantially higher than that under S. alterniflora ((0.23±0.01)mg/kg), the intergrowth area of the two species((0.32±0.01)mg/kg)and mudflat((0.21±0)mg/kg), respectively. This suggested that Ph. australis possibly facilitates the production and emissions of N₂O in sediment in the wetland. It is worth further studying on the roles of Ph. australis for the control and evaluation of N₂O emissions in a coastal wetland.

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印杰,汤逸帆,崔洪磊,韩建刚,李萍萍. 崇明东滩湿地不同植物群落下沉积物中CO₂和N₂O的释放动态研究[J]. 南京林业大学学报（自然科学版）. 2016, 40(04): 29-34 https://doi.org/10.3969/j.issn.1000-2006.2016.04.005

YIN Jie, TANG Yifan, CUI Honglei, HAN Jiangang, LI Pingping. Emissions of CO₂ and N₂O in sediments with different vegetation types in Chongming Dongtan wetland[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2016, 40(04): 29-34 https://doi.org/10.3969/j.issn.1000-2006.2016.04.005

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基金

收稿日期:2015-11-23 修回日期:2016-01-11
基金项目:国家自然科学基金项目(41375149); 国家林业公益性行业科研专项项目(201404305); 江苏省“青蓝工程”资助项目(苏教师[2016]15号); 江苏高校优势学科建设工程资助项目(PAPD)
第一作者:印杰(1599167430@qq.com), 主要负责CO₂测定实验及相关内容写作; 汤逸帆(422523942@qq.com),主要负责N₂O测定实验及相关内容写作。*通信作者:韩建刚(hanjiangang76@126.com),教授,指导论文的资料整理,文字修改; 李萍萍(lipingping@ujs.edu.cn),教授,指导论文的选题、结构组织与对策修改。
引文格式:印杰,汤逸帆,崔洪磊,等. 崇明东滩湿地不同植物群落下沉积物中CO₂和N₂O的释放动态研究[J]. 南京林业大学学报(自然科学版),2016,40(4):29-34.