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本文对川中地区30年生柏木人工林营养元素含量及其空间分配进行了研究.结果表明,乔木层氮磷钾钙镁积累总量为3131.630kg/ha,枝叶氮磷钾量分别占总量的68.39%,68.16%和68.77%,过度剔枝将造成比采伐干材大得多的养分损失;不同冠层针叶中氮磷钾含量均以上层相对较高,各生长级林木间亦以上层养分含量差异较大;土壤中养分可利用部分较少,水解氮1.200T/ha,速效磷0.05T/ha,速效钾2.559t/ha.研究结果,对柏木人工林营养诊断及其它营林措施具有参考价值.
The results showed that the total N, P, K, Ca, and Mg accumulation in the arbor layer was 3131.630kg / ha, the N, P and K contents in the branches and leaves accounted for 68.39% of the total, respectively %, 68.16% and 68.77% respectively. Excessive branching will cause much more loss of nutrients than that of the harvested dried wood. The contents of N, P, and K in different canopy needles are relatively high in the upper layer, The contents of soil nutrients were less available, with 1.200T / ha of hydrolyzed nitrogen, 0.05T / ha of available phosphorus and 2.559t / ha of available potassium.Results of this study showed that there were Reference value.