CO2 efflux under different grazing managements on subalpine meadows of Shangri-La, Northwest Yunnan Province, China
文献类型：期刊论文
| 作者 | Wang Jun ; Sha Liqing ; Li Jianzhou ; Feng Zhili |
| 刊名 | Acta Ecologica Sinica
 |
| 出版日期 | 2008 |
| 卷号 | 25期号:8页码:3574-3583 |
| 中文摘要 | 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. |
| 公开日期 | 2017-01-04 |
| 源URL | [http://ir.xtbg.org.cn/handle/353005/10206]  |
| 专题 | 西双版纳热带植物园_全球变化研究组 |
| 推荐引用方式 GB/T 7714 | 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. |
| APA | Wang Jun,Sha Liqing,Li Jianzhou,&Feng Zhili.(2008).CO2 efflux under different grazing managements on subalpine meadows of Shangri-La, Northwest Yunnan Province, China.Acta Ecologica Sinica,25(8),3574-3583. |
| MLA | Wang Jun,et al."CO2 efflux under different grazing managements on subalpine meadows of Shangri-La, Northwest Yunnan Province, China".Acta Ecologica Sinica 25.8(2008):3574-3583. |
入库方式： OAI收割
来源：西双版纳热带植物园
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。