施肥对落叶松人工林林地土壤肥力的可持续性的影响

以14年生和34年生落叶松人工林为研究对象，对该林分所在的白浆化暗棕壤林地进行施肥试验。设置了9个施肥处理和1个无肥对照，运用土壤生物和养分指标讨论了不同林龄落叶松人工林林地土壤肥力可持续性指数。结果表明：(1)不同施肥处理对土壤肥力可持续性指数影响不同；(2)同一施肥处理对不同林龄的土壤可持续性指数影响也不同；在林木生长最快的幼龄期施肥，提高土壤肥力可持续性指数的效果要明显高于在林木近熟期施肥；(3)施用有机肥有利于提高生物管理指数，单施化肥可增加土壤氮、磷的管理指数；(4)有机肥和化肥混施是提高林地土壤可持续性指数的最好施肥方式。

Effects of fertilization on sustainability of soil fertility of larch plantations

The test of fertilizer application for 14 year-old and 34 year-old larch plantations grown in lessivage dark brown soil was conducted. Nine fertilizer application rates and a check were designed. The results showed that, (1) the sustainable index of soil fertility was affected by different treatments of fertilizer application. (2) The effect of the same treatment on the sustainable index of soil fertility varied with the different forest age. Fertilizer application in the young stage of the quickest growth increases the sustainable index of soil fertility more markedly than that of the near-mature stage. (3) Organic fertilizer application was beneficial to promoting biological management index. Chemical application was able to increase management index of N and P. (4) Mixed application of organic fertilizer and chemical fertilizer was the best one to increase the sustainable index of the forest soil fertility.