多代刺槐能源林对土壤理化性质的影响

Effect of Robinia pseudoacacia energy forest at multi-generations on Soil Physical and Chemical Properties

以河南洛宁吕村林场一代,二代,三代刺槐能源林为研究对象,以未造林荒地为对照,通过测定土壤理化性质并进行对比分析,评价刺槐林对土壤理化性质的影响。结果表明:刺槐林可以改善土壤理化性质。在土壤物理性质方面,刺槐林改良土壤质地和结构,使土壤更加疏松、通气和水分效果更加显著。土壤化学性质方面,刺槐林地与荒地土壤pH差异不显著,均呈现弱酸性。相同土层深度下,土壤有机质,全氮,速效氮均呈现三代林>二代林>一代林>CK,差异显著。土壤磷含量变异系数比较大,相同深度下,全磷,速效磷含量变化空间分布有所不同。速效钾的含量分布也呈现不同的规律。树木对土壤养分具有"表聚效应",土壤表层与深层土壤差异显著,随土壤深度增加,有机质、全氮、全磷、速效氮、速效磷和速效钾含量,呈现出垂直结构变化,含量不断降低。

This study investigated the influence of Robiniapseudoacacia energy forest at multi-generations on soil physical and chemical properties, this research chose first generations and second generations and third generations Robinia pseudoacacia energy forest planted in Lucun forest farm Luoning city, Henan province, and the unplanted was chosen as the control. The results showed that the Robinia pseudoacacia forest improved the soil physical and chemical properties- On the soil physical land, Robinia pseudoacacia forest can improve the soil texture and structure. On the soil chemical land, there was no significant difference in soil pH between Robinia pseudoacacia forest and the unplanted. At the same depth, the content of organic matter, the total nitrogen and available nitrogen were： third generations 〉 second generations 〉 first generations 〉 control. And total phophorus available phosphorus, available potassium had no obvious regularity. The nutrient content in different types stands generally had the surface accumation characteristic,and decreased with the increase of soil depth.