树木园不同树种人工林土壤养分变化特征

人工造林对土壤养分变化的影响一直是森林培育过程中受到关注的问题之一。采用典型样地取样和室内分析的方法,研究了树木园不同针阔叶树种林地土壤养分含量的变化。结果表明:相同立地条件下,人工造林后土壤养分的表聚性明显,且树种不同对土壤养分含量的影响不同;栽植针叶树种主要是改善浅层土壤全氮含量,并明显提高0~40 cm土层有机质、速效氮、速效磷含量,而对土壤全磷、全钾含量影响不明显,甚至降低了土壤全磷含量;而栽植阔叶树种后,不同土层深度土壤有机质、全氮、速效氮和速效磷含量均高于对照样地,且对改善土壤全氮、速效氮和速效磷含量的效果明显好于针叶树种。内蒙古林科院树木园不同树种林地土壤养分含量明显增加,尤其是增加表层0~5 cm有机质、全氮、速效氮和速效磷含量,而阔叶树种对增加全磷、速效磷含量好于针叶树种。

Characteristics of Soil Nutrient Changes of Plantation of Different Tree Species in Arboretum

The influence of artificial afforestation on soil nutrient change has been one of the problems concerned in the process of forest cultivation.The changes of soil nutrient content of different coniferous and broad-leaved tree species in arboretum have been studied with sampling and indoor analysis.The results show that under the same site conditions,the apparent accumulation of soil nutrients is obvious after afforestation,and the effect of different species on soil nutrient content is different.The main purpose of planting coniferous tree is to improve the content of total nitrogen in shallow soil,and to increase the content of organic matter,available nitrogen and available phosphorus in 0-40 cm soil layer,but the effect on the content of total phosphorus and total potassium is not obvious,even to reduce the content of total phosphorus in soil.The contents of soil organic matter,total nitrogen,available nitrogen and available phosphorus in different soil layers are higher than those in the control plots,and the effect of improving the contents of total nitrogen,available nitrogen and available phosphorus is better than that of coniferous species.In this arboretum,the soil nutrient content of different tree species have significantly increased,especially the organic matter content,total nitrogen,available nitrogen and available phosphorus in 0-5 cm soil layer.However,the content of total phosphorus and available phosphorus in broad-leaved tree species are better than that in coniferous tree species.