黄土丘陵区植被次生演替灌木初期的土壤养分特征

对黄土丘陵区植被次生演替灌木初期的土壤养分特征进行了研究。结果表明:灌木初期土壤养分含量总体上表现出0~20 cm土层明显高于20~60 cm土层,而20~40 cm和40~60 cm间无显著差异。0~60 cm土壤深度内,土壤养分因子含量平均值变化范围分别为:有机质4.66~9.83 g.kg-1,全氮0.33~0.61 g.kg-1,全磷0.49~0.52 g.kg-1,有效氮21.56~41.80 mg.kg-1,有效磷0.73~1.31 mg.kg-1,有效钾58.31~102.01 mg.kg-1。灌木初期的土壤养分条件略好于草本阶段,说明植被演替草本阶段对土壤的培肥作用为群落向灌丛演替阶段发展提供了一个较好的土壤养分环境。灌木初期不同,灌木树种间的土壤养分条件存在一定差异,表明不同灌木树种定居所需适宜的土壤养分条件也不同;灌木初期除土壤全磷外,其他各养分因子间均表现出极显著线性相关关系(P<0.01)。

This paper studied the characteristics of soil nutrients in shrub appearance stage of vegetation secondary succession in the hilly-gullied loess region.The results indicated that the content of soil nutrient factors overall exhibits 0～20 cm soil layer significantly higher than 20～60 cm soil layer,between lower layers 20～40 cm and 40～60 cm was no significant difference.In the 0～60 cm soil depth,the change range of average values of soil nutrient factors content were respectively organic matter:4.66～9.83 g·kg...