To determine the soil fertility of pure Castanopsis hystrix forest, C. hystrix –Pinus elliottii mixed
forest and pure P. elliottii forest in the south subtropical area, soil pH values, organic matter, total nitrogen, total
phosphate, total potassium, hydrolysable nitrogen, available phosphate, and available potassium was chosen as
evaluation indicators. Soil fertility was analyzed by grey correlative degree analysis, and ranked by correlation
degrees comprehensively. The results indicated that the contents of organic matter, total nitrogen, hydrolysable
nitrogen, available phosphate and available potassium had decline tendency with the increase of soil layer depth,
while pH value, the content of total phosphate and total potassium have no difference in five different soil layers.
The grey correlative degree analysis shows the best soil fertility was observed in pure C. hystrix forest, followed by C. hystrix –P. elliottii mixed forest, and pure P.elliottii forest has poorest soil fertility status.
|