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

title: CO2 efflux under different grazing managements on subalpine meadows of Shangri-La, Northwest Yunnan Province, China
author: Wang Jun;  Sha Liqing;  Li Jianzhou;  Feng Zhili
Issued Date: 2008
Abstract: Soil carbon stored on the Tibetan Plateau appears to be stable under current temperature, but it may be sensitive to global warming. In addition, different grazing systems may alter carbon emission from subalpine meadow ecosystems in this region. Using a chamber-closed dynamic technique, we measured ecosystem respiration (ER) and soil respiration (SR) rates with an infrared gas analyzer on a perennial grazing meadow (PM) and a seasonal grazing meadow (SM) of Shangri-La in the Hengduan Mountain area. Both PM and SM showed strong unimodal seasonal variations, with the highest rates in July and the lowest in January. Significant diurnal variations in respiration were also observed on PM, affected mainly by air and soil temperatures, with the highest rates at 14:00 and the lowest before dawn. Both ER and SR rates were higher on PM than on SM from June to October, suggesting that the higher grazing pressure on PM increased respiration rates on subalpine meadows. The exponential model F = aebT of soil temperature (T) explained the variation in respiration better than the model of soil moisture (W) (R2 = 0.50–0.78, P < 0.0001), while the multiple model F = aebTWc gave better simulations than did single-factor models (R2 = 0.56–0.89, P < 0.0001). Soil respiration was the major component of ER, accounting for 63.0%–92.7% and 47.5%–96.4% of ER on PM and SM, respectively. Aboveground plant respiration varied with grass growth. During the peak growing season, total ecosystem respiration may be dominated by this above-ground component. Long-term (annual) Q10 values were about twice as large as short-term (one day) Q10. Q10 at different time scales may be controlled by different ecological processes. The SM had a lower long-term Q10 than did the PM, suggesting that under increased temperature, soil carbon may be more stable with reduced grazing pressure.
Source: Acta Ecologica Sinica
Appears in Collections:全球变化研究组_期刊论文

Files in This Item:

File SizeFormat
CO2 efflux under different grazing managements on subalpine meadows of Shangri-La, Northwest Yunnan Province, China.pdf1382KbAdobe 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:
Wang Jun,Sha Liqing,Li Jianzhou,et al. Co2 Efflux Under Different Grazing Managements On Subalpine Meadows Of Shangri-la, Northwest Yunnan Province, China[J]. Acta Ecologica Sinica,2008,25(8):3574-3583.

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
 [Wang Jun]'s Articles
 [Sha Liqing]'s Articles
 [Li Jianzhou]'s Articles
CSDL cross search
 Similar articles in CSDL Cross Search
 [Wang Jun]‘s Articles
 [Sha Liqing]‘s Articles
 [Li Jianzhou]‘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