黑核桃(Ｊｕｇｌａｎｓｎｉｇｒａ)为核桃科核桃属乔木,原产北美洲,是一种果材兼优,多用途的珍贵阔叶树种,也是世界上公认的最佳硬阔用材树种之一。1984年我国开始大量引种,因其具有适生范围广,抗土壤逆境强,病虫害少,比较速生,多用途等优良特性,各省市相继引种栽植。采用... Juglansnigra walnut is a walnut tree, native to North America, is a fruit tree and excellent, multi-purpose precious broad-leaved species, but also the world’s best known hardwood timber species. In 1984, China began to introduce a large number of species, because of its wide range of suitable living, anti-soil adverse environment, fewer pests and diseases, relatively fast-growing, multi-purpose and other excellent features, provinces and cities have introduced planting. use...