毛竹厚朴混交林对杉木林迹地土壤肥力的影响

Effects of Mixed Forest of Magnolia officinalis and Phyllostachys heterocycla cv.pubescens on Soil Fertility of Logged Site of Chinese fir Forest

于2006、2008年2次对杉木林采伐迹地2003-2004年人工营造的毛竹厚朴混交林进行土壤理化性质的采样分析,结果表明:不同坡位不同土层的pH值均有升高,且差异达到了显著水平;土壤有机质含量增加,土壤速效氮、速效磷及速效钾等养分指标随林分生长年份的增加而表现出递增趋势;有机质含量、土壤速效氮、速效磷均表现出0～20cm土层高于>20～40cm土层,速效钾表现不规律,表层(10～20cm)土壤速效氮及速效磷含量增加幅度表现出中坡位>下坡位>上坡位。

Determinations were made on soil physical and chemical properties of soil sampled in 2006 and 2008 in mixed forest of Magnolia officinalis and Phyllostachys heterocycla cv. pubescens planted in 2003 and 2004 in logged site of Chinese fir forest. The result showed that pit at mixed forest increased significantly at different layers and slopes, as well as organic matter content. Soil available nitrogen, and potassium augmented with the age of forest. Organic matter content, available nitrogen and phosphorus at soil layer of 0-20cm were higher than that at 20-40cm, while potassium had no regulation. Available nitrogen and potassium increase at 10-20cm showed middle hill 〉downhill 〉uphill.