桉树人工林生态系统养分循环与平衡研究Ⅰ. 桉树人工林生态系统的养分贮存

采用田间试验和定位方法，在标准样地中研究养分的输入、输出和贮存。桉树人工林生态系统的养分贮存，包括土壤、桉树林分和凋落物三者贮存的养分。在田间试验的基础上，获得了大量的分析数据。论述了刚果W5桉树人工林生态系统土壤养分的贮存量、林分的养分贮存量和凋落物层的养分贮存量以及上述分系统内大、中量元素的含量比例。土壤养分的贮存量，全量养分以K最多，其次为N、P；有效养分贮存量大小的顺序为N，K，Ca，P，Mg，Mn，Zn，Cu，B。桉树林分的总养分贮存量，是逐年增加的，但以第2年的增量最大；各元素贮量大小，则每年不同。凋落物层的养分贮存量，总体上逐年增长，但以第4年最多；各元素贮存量大小的顺序为N，Ca，Mg，K，P。这些结果，对于指导桉树施肥，有重要的参考价值。

The nutrient cycling and balance of eucalyptus plantation ecosystem Ⅰ. The nutrient storage of eucalyptus plantation ecosystem

By field trial and positional method, at the standard plots, we studied the nutrient input, output and storage of eucalyptus plantation ecosystem in Leizhou Peninsula, China. The results showed that, K storage was the highest in the total soil nutrient storages, followed by N and P. The order of the available nutrients was N, K, Ca, P, Mg, Mn, Zn, Cu and B. The total nutrient storage of eucalyptus forest increased year by year, but the highest increment occurred at the two-year-old forests. For the individual element, the storage was different every year. The nutrient storage of litter layer also increased year by year as a whole, but the highest increment occurred at the four-year-old stands. The order of element storages in the layer was N, Ca, Mg, K, and P. It is suggested that these results should provide important reference for the practice of eucalyptus fertilization.