Soil nutrient and soil enzyme activity at various types of slopes in disturbed area of Xiangjiaba hydropower construction

Taking seven types of slopes in the disturbed area of Xiangjiaba construction as test objects this paper measured their soil pH, soil nutrient and soil enzyme activity. The results showed that the soil at natural forests (NF) was acidic, while the others were weakly alkaline at different degree. Variation of soil nutrients in different slopes is obvious; soil enzyme activity is also a significant difference between different slopes. The soil of D slope (Thick layer substrate, TLS) is the highest in activity of urease and invertase, the soil of natural forests (NF) is the highest in activity of neutral phosphatase, while the soil in natural forests (NF) is the lowest in activity of catalase. The soil of discarded residue (DR) is the lowest in activity of urease, invertase and neutral phosphatase except catalase. Soil pH and soil nutrient factors and enzyme activities showed some differences between C, D, E three slopes that were using the same remediation technology thick layer substrates. The analysis of correlation indicates that the activities of four soil enzymes were highly correlated not only with each other, but also were closely with soil organic matter, available nitrogen, total nitrogen, suggested that integrated enzymatic activity could be used to indicate and estimate soil fertility of artificial remediation slopes in the disturbed area.