论文部分内容阅读
研究了95个桉树林的土壤肥力。按母岩将95个林分土壤合并为花岗岩、石灰岩、紫色砂岩、砂页岩、玄武岩发育的土壤类型,分析各类土壤的理化性质与桉树生长的关系。结果表明:花岗岩发育成的土壤的容重较小,非毛管孔隙较多,通气好,持水量一般;各种养分都处于中等或偏低水平,但在5种母岩形成的土壤中多处于较高水平,整体土壤肥力较高;石灰岩发育成的土壤容重最小,毛管孔隙和最大持水量大,非毛管孔隙较小,故保水能力强,通气差,全N含量在5种土壤中稍低,其它养分含量均较高,整体土壤肥力高;紫色砂岩发育成的土壤容重大,非毛管孔隙极少,通气差,持水量小,全K和速效K含量位于5种土壤之首,其它养分含量低,整体的土壤肥力低;砂页岩发育成的土壤毛管孔隙度小,非毛管孔隙度大,通气好,在5种土壤中全N含量较高,其它养分含量处于中等或较低水平,土壤肥力较差;玄武岩发育成的土壤容重中等、毛管孔隙少、非毛管孔隙中等,全P和有效P含量在5种土壤中较高,其余养分含量较低,土壤肥力较低。将桉树林地与其它林地的土壤理化性质比较可知,桉树林地的土壤容重大,通气不良,持水能力差,有机质、全N、全K、速效N、速效K含量低。
The soil fertility of 95 eucalyptus forests was studied. According to the parent rock, 95 stands of soil were combined into the soil types of granite, limestone, purple sandstone, sand shale and basalt. The relationship between the physicochemical properties and the growth of eucalyptus was analyzed. The results showed that the granite developed soil had smaller bulk density, more non-capillary pores, better aeration and more water holding capacity. All kinds of nutrients were at medium or low level. However, High soil fertility, higher soil fertility; limestone developed to the smallest bulk density, capillary porosity and maximum water holding capacity, non-capillary pores smaller, so the water retention capacity, poor ventilation, the total N content of 5 kinds of soil slightly lower, The contents of other nutrients were high and the overall soil fertility was high. The purple sandstone developed into a large volume of soil with few non-capillary pores, poor aeration and low water holding capacity. The contents of total K and available K were the highest among the five soils. Low, and low overall soil fertility. The capillary porosity developed by sand shale was large, the non-capillary porosity was good, and the aeration was good. Among the five soils, the total N content was higher and the other nutrient contents were at medium or lower levels. Soil fertility is poor; basalts develop into medium weight, less capillary pores, medium non-capillary pores, higher total P and available P content in the five soils with lower nutrient contents and lower soil fertility. Comparing the soil physical and chemical properties of eucalyptus woodlands with other woodlands, the eucalyptus forestland is characterized by large soil volume, poor aeration, poor water holding capacity, low organic matter, total N, total K, available N and available K.