不同林龄红松人工林土壤养分及微量元素的变化规律

研究了不同林龄人工红松林土壤水解氮、有效磷、速效钾及微量元素变化规律。结果表明,不同林龄阶段红松人工林根际和非根际土壤水解氮、速效钾和有效磷质量分数均大于天然次生林;水解氮质量分数均表现出先降低后升高再降低的趋势,但总体上呈现随年龄增长而降低的趋势;与水解氮不同,速效钾和有效磷质量分数则表现出先升高再降低;红松人工林不同发育阶段根际土壤有效铜、有效铁、有效锌和有效锰的质量分数均大于红松人工林不同发育阶段非根际土壤的质量分数。综合各因素和已有研究结论,最终得出混交林这种经营方式更适合研究区域内红松的生长。

Changing Rules of Soil Nutrients and Microelements in Korean Pine Plantations of Different Ages

An experiment was conducted to study the changing rules of soil hydrolytic N,available P,quick-acting K and microelements in Korean pine plantations of different ages.Result indicates that the contents of soil hydrolytic N,available P and available K in rhizophere and nonrhizosphere soil in Korean pine forests of different ages are higher than those in the secondary forests,and hydrolytic N content declines at first and then increases and later declines again,but in general,it shows a declining trend with increasing age.Available P and quick-acting K contents increase first and then decrease.The contents of available Cu,available Fe,available Zn and available Mn in rhizophere soil are higher than those in nonrhizosphere soil.It is concluded that the management mode for the mixed forest is more in favor of the growth of Korean pine in the study area.