关键词: 线虫密度, 食细菌线虫, 相互作用, 土壤氮素矿化

Abstract: By using the 1982〖KG-*2〗-〖KG-*7〗2006 NASA/GIMMS half-monthly composite NDVI data of 8 km resolution and related climate data, and based on the investigations of terrain, land use, and vegetation, this paper classified Shanxi Province into 9 typical ecological areas, and analyzed the dynamic changes of annual, decadal, and monthly NDVI as well as the responses of the NDVI to precipitation, air temperature, and PSDI in the areas. The results indicated that in recent 25 years, the NDVI in the Province had an increasing trend, and exhibited an obvious annual variation. The NDVI was higher in southern part than in northern part, and in eastern part than in western part. For different ecological areas, forested area had the highest NDVI, followed by agricultural area, and pasturing area. The vegetation index in forested area increased obviously in spring, and that in most ecological areas except southern agricultural area represented single apex type. The NDVI in forested area related well with air temperature, and the correlation of NDVI with PDSI was more closely than with precipitation or air temperature. The responses of vegetation index to climate change had an obvious lag effect, and the annual variation of precipitation, especially the accumulative effect of precipitation, affected vegetation index significantly.

Key words: Nematode density, Bacteria-feeding nematode, Interaction, Soil nitrogen mineralization