七子花土壤的研究及种质资源的保护

Studies on the Soil of Heptacodium Minconioides and Its Conservation of Germ Plasm Resources.

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。

Comparative studies on the physical and chemical properties of Heptacodium miconioides soil and the botanical garden soil which was used for reproduction of cutting show that in H.minconioides soil, total porosity, the contents of organic matter, water, total N, total P, total K, total Na, total Mn, total Mo, available N, olsen-P and available K are higher; bulk density, the contents of total Ca, total Mg, total Sr, total Fe and total Li are lower. We infer that the contents of Mn, Mo, available N, olsen-P, available K in soil are the limiting fator of the distribution of H. Minconioides. When we select soil for reproduction of cutting of H.minconioides, the contents of Mn and Mo must be the most important factor to be considered. Some measures about how to conserve germ plasm resources of H.minconioides are put forward.