摘要
应用海拔引起的自然温度梯度作为气候变化研究的替代系统 ,结合网袋法 ,目的在于评价气候变化对草甸草原、羊草 (L eymus chinensis)草原和大针茅 (Stipa grandis)草原混合凋落物分解过程的可能影响。结果表明 :较之当前气候 ,在气温升高 2 .7℃ ,降水基本保持不变的气候变化情景下 ,3种凋落物的分解速率分别提高了 15 .38%、35 .83%和 6 .6 8% ;而在温度升高 2 .2℃或更高 ,降水降低 2 0 %或更高的气候变化情景下 ,各种凋落物的分解速率将降低。此外 ,各种凋落物的分解动态对所模拟的气候变化情景的响应不同 ,但没有发现凋落物分解速率与凋落物本身 C、N、C/ N间的密切关系。
The objectives of this study were to assess the potential effects of climate change on the decomposition of mixed litter from three steppe communities dominated by Stipa baicalensis, Leymus chinensis, and S. grandis, respectively. We applied the buried bag method along an altitudinal temperature gradient to investigate the potential effect of climate change on litter decomposition.Under current climatic conditions, if the mean air temperature rises 2.7°C and no change occurs in precipitation, the decomposition rates of the three litter mixtures will increase 15.4%, 35.8% and 6.7%, respectively. If mean air temperature increases by 2.2°C or more in combination with a 20% or more fall in precipitation, then the decomposition rates of these litter mixtures will decrease. Different responses of decomposition to simulated climate change were observed among the three litter mixtures used in the study. The results contrasted to those reported by other researchers who found close relationships between decomposition rates, the C, N content and C/N ratio of litter mixtures.
出处
《植物生态学报》
CAS
CSCD
北大核心
2000年第6期674-679,共6页
Chinese Journal of Plant Ecology
基金
国家重大基础研究项目!(G19990 4340 7)
国家自然科学基金重点项目!(39730 110 )
中国科学院内蒙古草原生态系统定位研究站开放基金
关键词
气候变化
海拔梯度
凋落物
草原植物群落
Climate change, Altitudinal gradient, Litter mixture,Decomposition
