海南岛东部地区桉树树种/种源试验*

在海南岛东部进行的桉树１１个树种７９个种源试验，５年的结果表明，不同树种种源间生长差异极显著，来自印度尼西亚Ｍｔ．ｍａｎｄｉｒｉ的尾叶桉１２８９５种源是所有参试树种／种源中表现最好的，树高、胸径和每公顷材积分别为１３．８２ｍ、１２．５４ｃｍ和１２８．３４ｍ３。同一树种种源间生长差异也极显著，最佳种源的每公顷材积与最差种源相比，尾叶桉为８．４６：１，细叶桉５．８６：１，赤桉５．３２：１和巨桉３．０４：１。细叶桉、赤桉和巨桉种源树高、胸径和材积生长与原产地纬度显著负相关，尾叶桉种源与原产地海拔高极显著负相关。本文提出了适合海南岛东部地区生长的树种和种源。

Trial of Eucalypt Species/Provenances in the East Part of Hainan Island

The results of species/provenance trial involved 11 species and 79provenances at 5- year-old in the east part of Hainan Island showed that the growth differ-ences among 79 provenances within the different species were highly significant while thegrowth differences among provenances within the same species were also highly significant.The ratios of the best provenance and the worse ones on volume per hectare for E.urophylla,E.tereticornis,E.camaldulensis and E.grandis were respectively 8.46 :1,5. 86 :1,5.32:1and 4.03:1.The height growth,DBH and volume per hectare of E.tereticornis,E.camaldulensis and E. grandis were respectively significant and there were negative correla-tions with the latitude of native habitat while the height growth,DBH and volume perhectare for E. urophylla was highly significant and with negative correlations with the alti-tude of native habitat.The paper have put forward some other species and provenances suit-able for planting in the east part of Hainan Island.