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赤按（ＥｕｃａｌｙｐｔｕｓｃａｍａｌｄｕｌｅｎｓｉｓＤｅｈｎｈ）自然分布在澳大利亚（除塔斯马尼亚州以外）的整个大陆各州。由于适应性强，有较高的经济价值，我国及世界部分国家和地区广为引种栽培。为了系统地研究赤桉地理种源的变异规律及生产力差异，我们对中国中亚热带五个赤桉种源试验的３５个种源进行了调查，对获得的材料进行了多种分析，认为赤桉具有纬向倾群变异规律，开发现不同生境：不同种源及它他的互作效应极为显著。主分量分析表明，影响赤桉生长发育的主要因素首先是温度，其次是降水。各种相关分析表明，可依根苗期和幼林阶段的性状表现进行种源的早期选择，并为中亚热带不同生态区初步评选了适生的优良种源。
Red elephant (EucalyptuscamaldulensisDehnh) Natural distribution in Australia (except Tasmania) throughout the mainland states. Due to its strong adaptability and high economic value, it is widely introduced and cultivated in our country and some countries and regions in the world. In order to systematically investigate the variation and productivity differences of geographical provenances of Eucalyptus grandis, we investigated 35 provenances of five provenances of Eucalyptus urophylla in the subtropical China and conducted a variety of analyzes on the obtained materials, With the variation rule of zonal declination, different habitats are developed: the effects of different provenances and their interactions are extremely significant. Principal component analysis showed that the main factors affecting the growth and development of Eucalyptus urophylla first temperature, followed by precipitation. All kinds of correlation analysis showed that the early selection of provenances could be conducted according to the traits of root and seedling stage and young forest stage, and the good provenances were preliminarily selected for different ecological zones in the subtropics.