Advanced   Register
XTBG OpenIR  > 全球变化研究组  > 期刊论文

title: Effects of precipitation exclusion on N2O emissions in a savanna ecosystem in SW China
author: Li, Jing;  Jin, Yanqiang;  Liu, Yuntong;  Zhang, Yiping;  Grace, John;  Song, Qinghai;  Sha, Liqing;  Lin, Youxing;  Chen, Aiguo;  Li, Peiguang;  Fei, Xuehai
Issued Date: 2018
Abstract: Savanna ecosystems play a crucial role in global N2O emissions. However, our understanding of N2O emissions under limiting precipitation conditions is lacking. This study evaluates the effects of precipitation reduction on soil N2O fluxes from a woody savanna ecosystem in Yunnan Province, Southwest China. Precipitation exclusion shelters were installed above the tree canopy, and four total treatments were established as follows: a control (CK) and precipitation exclusions of 30% (PE3), 50% (PE5), and 70% (PE7). Two years (2015-2016) of N2O fluxes, soil temperature and soil water content data were collected. The N2O fluxes were generally low, ranging from 0.039 to 0.245 mg N m(-2) day(-1), and they were strongly linked to precipitation events. Additionally, the N2O fluxes during the rainy season were significantly greater than those during the dry season. The maximum N2O flux was observed in August, and the minimum flux occurred in December. Precipitation exclusion had a significant negative influence on the N2O fluxes. The N2O emissions of CK, PE3, PE5, and PE7 were 0.20, 0.17, 0.13, and 0.12 kg N ha(-1) yr(-1), respectively. With the exacerbation of precipitation exclusion, the decrease rate of precipitation exclusion on the N2O emissions increased over the entire year (eventually reaching 41.8% in PE7), but the decrease rate of precipitation exclusion on the soil N2O emission during the dry season was stronger than that during the rainy season. Additionally, the proportion of dry season N2O emissions to total annual emissions decreased (from 45% to 41%), and that of rainy season N2O emissions to total annual emissions increased (from 55% to 59%) over the year, whereas they exhibited a stable trend from PE5. The data show that the Yuanjiang savanna is a net source of N2O; precipitation reduction decreases the N2O emissions in the savanna regions, indicating that precipitation reduction can only slow the increase in the N2O concentration in the atmosphere and can therefore slow global warming. In addition, the N2O emissions during the dry season may play a significant role in total N2O emissions and be more sensitive to precipitation reduction than those during rainy season. These possibilities should be considered in future studies, especially in those ecosystems that experience substantial inter-annual climatic fluctuations.
Source: ATMOSPHERIC ENVIRONMENT
Related URLs: 10.1016/j.atmosenv.2018.05.035
Appears in Collections:全球变化研究组_期刊论文

Files in This Item:

File SizeFormat
Effects of precipitation exclusion on N2O emissions in a savanna ecosystem in SW China.pdf923KbAdobe PDFView  Download


全文许可: Creative Commons 署名-非商业性使用-相同方式共享 3.0

Recommended Citation:
Li, Jing,Jin, Yanqiang,Liu, Yuntong,et al. Effects Of Precipitation Exclusion On N2o Emissions In A Savanna Ecosystem In Sw China[J]. Atmospheric Environment,2018,187(X):1-8.

SCI Citaion Data:
Service
 Recommend this item
 Sava as my favorate item
 Show this item's statistics
 Export Endnote File
Google Scholar
 Similar articles in Google Scholar
 [Li, Jing]'s Articles
 [Jin, Yanqiang]'s Articles
 [Liu, Yuntong]'s Articles
CSDL cross search
 Similar articles in CSDL Cross Search
 [Li, Jing]‘s Articles
 [Jin, Yanqiang]‘s Articles
 [Liu, Yuntong]‘s Articles
Scirus search
 Similar articles in Scirus
Related Copyright Policies
Null
Social Bookmarking
  Add to CiteULike  Add to Connotea  Add to Del.icio.us  Add to Digg  Add to Reddit 
所有评论 (0)
暂无评论
 
评注功能仅针对注册用户开放,请您登录
您对该条目有什么异议,请填写以下表单,管理员会尽快联系您。
内 容:
Email:  *
单位:
验证码:   刷新
您在IR的使用过程中有什么好的想法或者建议可以反馈给我们。
标 题:
 *
内 容:
Email:  *
验证码:   刷新

Items in IR are protected by copyright, with all rights reserved, unless otherwise indicated.

 

 

Valid XHTML 1.0!
Powered by CSpace