落叶松人工林土壤养分动态

Dynamic of Soil Nutrients under Larch Plantation

在立地条件一致的前提下 ,研究了落叶松人工林土壤养分含量的年动态变化趋势。结果表明 :7～ 8月份是纯林土壤养分急剧变化的时期 ,土壤养分含量的动态变化趋势与林龄无关 ;而混交林土壤养分的变化趋势较稳定 ,与纯林相比 ,各养分含量明显增加。落叶松人工纯林确实存在地力衰退的事实 ,并与林龄相关。

On the premise of identity for site conditions, the annual dynamic changes of soil nutrients under larch plantation were studied. The results show that the period of rapid change for soil nutrients in pure forest is in July and August, and the dynamic changes of soil nutrients have nothing to do with the forest age. But the variation of soil nutrients is more stable under the larch mixed forest. Compared with the pure artificial larch forest, the content of soil nutrients under larch mixed forest obviously increased. The annual average value shows that the soil degradation related to the forest age is true under the pure larch plantation.