内蒙古典型草原生态系统定位研究最新进展

中国科学院内蒙古草原生态系统定位研究站最近几年在草原生态系统多功能、草原生态系统碳循环与温室气体、气候变化对植物群落结构影响长期观测、草原生态系统退化与恢复过程、草原生态系统硫生物地球化学循环、放牧生态系统管理等领域取得较大进展。研究结果指出，农垦活动使有机碳损失34％，草原植被——土壤系统是甲烷的弱汇；20多年来，这一地区气候变化有变暖趋势，冬季增温明显，春季干旱进一步加剧，影响初级生产力生产；系统提出草原退化是草原生态系统退化，并对退化阶段进行了划分；在内蒙古冷蒿小禾草退化草原施用硫肥对提高初级生产力与羊毛性能方面有明显效果。

Update Progress on Grassland Ecosystem Research in Inner Mongolia Steppe

The studies on multi_functions of grassland ecosystem, carbon cycling and trace gases, long_term monitoring of climate change and its effect on grassland ecosystem, degradation and restoration processes of grassland ecosystem, sulful cycling and effect of sulful fertilizer on grazing ecosystem, and grazing ecosystem management have took a great progress at the Inner Mongolia Ecosystem Research Staton (IMGERS) since 1998. The results showed that organic carbon in soil was seriously affected by the conversion from grassland to cropland, it decreased by 34%, the soil_vegetation system was a light sink of atmospheric CH 4. the warming trend was observed at IMGERS in the recent 20 years, especially in winter. Temperature increases in the winter have aggravated the drought in spring in this region, hence the grassland productivity is decreased. Grassland degradation is grassland ecosystem degradation. The S fertilizer application could increase S concentration in grasses, productivity of communities of pasture and wool production and quality.