The walnut and Chinese Date are the main no-timber trees in the hilly region, propagated by grafting, which propagation technique needs 2-3years to culture the rootstock and costs much more money.

• 核桃和枣是主要的生态经济林树种，采用常规嫁接技术进行繁殖，生产周期长，成本高，不能适应产业化要求。