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对七子花的土壤和植物园用于扦插土壤的理化性质进行了比较研究。结果表明， 七子花土壤有机质丰富， 水分含量较高， 孔隙度大， Ｎ 、 Ｋ、 Ｎａ 、 Ｍｎ 、 Ｍｏ 及速效 Ｎ、 Ｐ和 Ｋ 含量高，而容重、 Ｃａ 、 Ｍｇ 、 Ｓｒ 、 Ｆｅ 和 Ｌｉ 的含量相对较低。推测 Ｍｎ 、 Ｍｏ 及速效 Ｎ 、 Ｐ、 Ｋ是七子花分布的限制因子。在选择七子花扦插繁殖的土壤时， Ｍｎ 、 Ｍｏ 的含量应优先考虑，并提出对七子花种质资源进行保护的一些措施。
The physico-chemical properties of soil and botanic garden of seven-flowered soil for cutting soil were comparatively studied. The results showed that the soil of Hevea brasiliensis had rich organic matter, high water content, large porosity, high contents of N, K, Na, Mn and Mo and available N, P and K, while its bulk density, Ca, Mg, Sr, Fe and Li The content is relatively low. It is speculated that Mn, Mo and available N, P, K are the limiting factors for the distribution of heptacodium. In the selection of seven-flowering cuttings soil, Mn, Mo content should give priority to, and put forward some of the seven seed germplasm resources protection measures.