Effects of Prescribed Fire on Meadow Soil Chemical Properties in Nanwenghe Nature Reserve.

The Nanwenghe Nature Reserve is located in the Daxing'anling forest region, which is abundant meadow resource which is prone to fire in fire season every year. In this paper, the change in the soil chemical properties of burned stands was emphasized. The results showed that: (1) Soil organic matter (SOM) concentration in burned stands showed an extremely significant difference from that in the control stands (p < 0.01). Alkali-hydrolysable N, available K and total N in the burned stands were significantly lower than those in the control stands (p < 0.05). (2) Total P, total K, pH and available P in the burned stands were not significantly different from the concentrations in the control stands (p > 0.05). (3) Available K, total N, total P and total K concentration showed no significant difference from June to September. The pH values increased with a variance of 8%, and pH values in July, August and September were significantly different from those in June. SOM concentrations obtained in July, August and September increased significantly, compared to the concentrations in June (p < 0.05). Alkali-hydrolysable N showed a decreasing trend for all conditions. [ABSTRACT FROM AUTHOR]