Abstract:

Converting cultivated land into forestland is an important way for the reconstruction of degraded ecosystem. To investigate the evolution of the soil under different models of returning farmland to forest, the physiochemical properties of soil taken from several forestry lands under 7 different models of returning farmland to forest in Hechuan District in ChongQing was compared. The results showed that the physiochemical properties of the soil were greatly improved. For the total soil porosity, capillary soil porosity and clay content, those of the reforestation fields were larger than those of the slope fields. Expect of available P and K, all of the soil nutrient was enhanced after the reforestation. The quality of recovering for the soil differed with different styles of reforestation qualitatively. The soil organic matter and N in the soil reforested by Chinese prickly ash, P in the soil reforested by Paniculed goldraintree, K in the soil reforested by Metasequoia obtained the maximum respectively.