美国山核桃及其在我国的适应性研究

美国山核桃是山区综合开发和农家税贫致富的优良经济树种。文章对美国山核桃坚果和木材的主要经济性状、生物学特性、地理生态学要求及原产地品种资源和我国引种驯化概况进行简介，并根据原产地美国的现实气候生态条件和我国的前期引种效果，将我国划分为4个美国山核桃引种栽培区，即适宜区、次适宜区、边缘区和不适宜区。

The pecan tree and its adaptability in China

The pecan tree, Carya illinoensis, is briefly introduced in tenns of major economic characters of the product nut and wood,biological characteristics,geo ecological requirements,US varietal resource,and status quo in China.Based on the previous introduction and acclimatization results in China empha sizing the findings from the adaptability study as well as the current eco climatic niche derived from the native habitat the US pecan belt,a division of the cultural ranges for growing this plant in China is designated with four regions mapped out ,namely the suitable Region spanning the subtropical east and along both sides of the Yangtze River,the Hypo suitable Region,the Marginal Region and the Unsuitable Region.The latter three regions are further divided into the southern and northern subregions.