带状皆伐改造对小兴安岭低质林土壤养分的影响

Effect of Strip Clear-Cutting on Soil Nutrients of Low-Quality Forest Stands after Reconstruction in Xiaoxing'an Mountain

对小兴安岭低质林进行顺山和横山带状皆伐改造,分析改造后土壤养分的动态变化。结果表明:土壤pH值逐渐降低,并且低于对照样地;土壤有机质、全量养分和速效养分一般在改造后的第1年上升,第2年下降,第3和第4年逐渐上升;到2012年时,各改造样地土壤有机质和全量养分仍低于对照样地,有些改造样地的土壤速效养分已经高于对照样地,土壤养分趋于改善;10 m带宽改造样地土壤养分较高。

An experiment was conducted to analyse the dynamic change in soil nutrients of low-quality forest stands in Xiaoxing＇ an Mountain after reconstruction by vertical and horizontal strip clear-cutting. The pH of soil reduces gradually and is less than that of check plot＇ s. Soil organic matter, total nutrients and available nutrients raise in the first year, reduce in the second year, and raise gradually in the third and fourth year after reconstruction. Soil organic matter and total nutrients of reconstructed samples are less than those of the check plots, the available nutrients of some reconstructed samples are more than those of the cheek plots by 2012, and the soil nutrients tend to be improved. The soil nutrients of reconstructed samples are higher with 10 m of the strip width.