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在直杆蓝桉种源试验中，测定６个种源５７个家系１３１个单株桉叶油的含量表明，直杆蓝桉不同种源、不同家系、不同单株、同一单株在不同季节的桉叶油含量差异极其显著。含油率最高的种源１７７４５／ＢＭ达２．２９％，比含油率最低的种源高４１．４％。８个含油率高的家系，各自单株含油率都较高。９个含油率大于２．５％的单株（平均达２．６７％），比总平均含油率高出３４．２％，是含油率较差的家系单株的３倍。不同季节枝叶含油率以１０月下旬至１２月为最高。
In the test of Eucalyptus globulus provenance, the content of eucalyptus oil in 131 single plants in 57 provenances of 6 provenances showed that Eucalyptus globulus had different provenances, different provenances, different pedigrees, different single plants and the same plant in different seasons Eucalyptus oil content is extremely significant difference. The highest oil content of provenance 17745 / BM reached 2.29%, 41.4% higher than the lowest oil source. Eight high oil-bearing families, their individual plant oil content is higher. Nine plants with an oil content greater than 2.5% (an average of 2.67%) were 34.2% above the total average oil content and three times those with lower oil content. The leaf oil content in different seasons was highest from late October to December.