[Objective] This study aims to explore the influence of enclosure regime on the soil properties of forest land in Zigui County in the Three Gorges Reservoir Area. [Method] We collected soil from closed forest, forest ...[Objective] This study aims to explore the influence of enclosure regime on the soil properties of forest land in Zigui County in the Three Gorges Reservoir Area. [Method] We collected soil from closed forest, forest converted from farmland, and natural secondary forest in Zigui County, and measured soil texture, bulk density, porosity, organic matter, maximum water holding capacity,water content, and content of total nitrogen, total phosphorus, total potassium,alkali-hydrolyzable nitrogen, available phosphorus, and available potassium.The findings were expected to lay a theoretical basis for forest enclosure in the Three Gorges Reservoir Area. [Result] The proportion of sands and soil bulk density in natural secondary forest were significantly lower than those in forest converted from farmland and closed forest, and the soil porosity, organic matter content, maximum water holding capacity, and overall nutrient content were significantly higher than those of the rest two forests. Soil organic matter was in significantly positive correlation with soil water holding capacity, total N,total K content, alkali-hydrolyzable N content, and available K content, and in negative correlation with soil bulk density(P<0.05). The natural secondary forest with high organic matter content had satisfactory soil properties. [Conclusion]Soil restoration in closed forest and forest converted from farmland lagged behind, and it took a long time for the improvement and restoration of the soil.展开更多
文摘[Objective] This study aims to explore the influence of enclosure regime on the soil properties of forest land in Zigui County in the Three Gorges Reservoir Area. [Method] We collected soil from closed forest, forest converted from farmland, and natural secondary forest in Zigui County, and measured soil texture, bulk density, porosity, organic matter, maximum water holding capacity,water content, and content of total nitrogen, total phosphorus, total potassium,alkali-hydrolyzable nitrogen, available phosphorus, and available potassium.The findings were expected to lay a theoretical basis for forest enclosure in the Three Gorges Reservoir Area. [Result] The proportion of sands and soil bulk density in natural secondary forest were significantly lower than those in forest converted from farmland and closed forest, and the soil porosity, organic matter content, maximum water holding capacity, and overall nutrient content were significantly higher than those of the rest two forests. Soil organic matter was in significantly positive correlation with soil water holding capacity, total N,total K content, alkali-hydrolyzable N content, and available K content, and in negative correlation with soil bulk density(P<0.05). The natural secondary forest with high organic matter content had satisfactory soil properties. [Conclusion]Soil restoration in closed forest and forest converted from farmland lagged behind, and it took a long time for the improvement and restoration of the soil.
