关键词: 土壤, 根瘤菌, 铜, 锌, 镉, 重金属形态

Abstract: Based on the statistic data of disaster-affected agricultural area in Fujian Province from 1985 to 2004, the affecting rates and variation values of the main agro-meteorological disasters including drought, flood, wind and hailstone damage, and cool and frost injury were calculated, and five grades were classified. Through grey correlation analysis, the correlation degree between the total disaster and each of the main disasters was worked out, and the weights of the affecting factors were obtained. An integrated assessment model was built to estimate the affecting degree of the disasters in the last 25 years, and the results showed that the appearance frequency of light and medium degree disasters was 88%. The most serious disasters happened in 1999, and the lightest ones were in 1984. The harmfulness of agro-meteorological disasters on agricultural production increased with time, and the fluctuation tended to be intensified.

Key words: Soil, Rhizobia, Copper, Zinc, Cadmium, Fractionation