江西省大岗山湿地松林土壤性质的变化

重点论述在江西省大岗山山下林场清除灌丛和其它次生植被的迹地上栽植湿地松，发育至中龄林、近熟林时土壤性质的变化规律。研究结果表明：次生植的土壤容重明显比湿地松澡龄林和近熟林的高，次生植被土壤的最大持水量则明显地低于中龄林和近熟林，非毛管孔隙度和总孔隙度也明显要和近熟林土壤遥低；中龄林土壤中细菌和放线菌的数量最少，真菌数量则随着树不断增大呈蛔的趋势；湿地松中龄林的土壤氧化还原酶活性明显比次生植被和近熟

Change of Soil Properties under Slash Pine in Dagangshan,Jiangxi Province

This article deals with the varied regulations of soil properties under slash pine plantation in Shanxia Forest Farm,Dagangshan,Jiangxi Province when it comes to the middle age and near matured age after planting on the slashing with cleared brush and other second plantation.The result shows that soil volume weight of the second plantation is obviously higher than that of the middle aged and near matured slash pine plantation,but maximum water holding capacity,non capillary pore and total capillary pore are just contrary.Quantity of bacteria and actinomycetes is the lowest in the middle aged soil and quantity of fungi rises while time goes by.Activity of oxido reductase in the middle aged slash pine plantation is obviously lower than that in the near matured aged plantation and second plantation.Organic nutrient runs higher when trees come older,but content of available phosphate in reverse.