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C、N、P元素的循环过程是影响森林生态系统功能的重要因素。本文利用空间代替时间的方法,对辽东山区落叶松人工幼龄林(10 a)、中龄林(25 a)、成熟林(50 a)土壤、根系的C、N、P含量及其生态化学计量特征进行了研究。结果表明:土壤C、N、P含量均随着林龄的增加而降低;C∶N和C∶P随林龄的增加而增加,N∶P随林龄变化不显著;落叶松根系N、P含量及C∶N和C∶P受林龄影响显著,N、P的含量随林龄的增加而降低,C∶N和C∶P随林龄增加而增加,C含量和N∶P随林龄变化不显著;随着林龄的增加,该地区落叶松人工林地地力呈逐渐衰退的趋势。建议通过间伐调整林分结构,并适度施肥来改善土壤肥力。
The cycle of C, N and P elements is an important factor that affects the function of forest ecosystem. In this paper, using the method of space instead of time, the contents of C, N, P and its eco-chemical composition in the artificial larch forest (10 a), middle-aged forest (25 a), mature forest Metrological characteristics were studied. The results showed that the content of soil C, N and P decreased with the increase of forest age. C: N and C: P increased with the increase of forest age, but N:P did not change significantly with age. P content and C: N and C: P were significantly influenced by stand age. The content of N and P decreased with the increase of stand age. C: N and C: P increased with increasing stand age. C content and N: P The change of stand age was not significant. With the increase of stand age, the ground force of Larch plantation showed a gradual decline. It is recommended to adjust the stand structure by thinning and fertilize moderately to improve soil fertility.