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1980年秋,我随中国杨树考察组对法国和意大利的主要杨树栽培地区的苗圃、试验林、造林地及研究所进行过一个多月的考察。对杨树病害的发生及防治情况有一点感性了解。兹简要汇述如下: 世界杨树人工集约经营以欧洲较为普遍,其中尤以意大利及法国出名,代表了目前世界先进水平。病害发生与气候条件密切相关。如果粗略的以巴黎作为法国南北气候分界的话,则大致巴黎以北代表北欧类型,巴黎以南代表南欧及地中海类型。而意大利北部波河平原气候及湿度较为特殊,与南部山区的土壤等条件差异较大,因而病害发生也略有不同。
In the autumn of 1980, I accompanied the Chinese poplar team to inspect the nurseries, experimental forests, afforestation sites and institutes in the major poplar cultivation areas of France and Italy for more than one month. The occurrence of poplar disease and prevention of a little emotional understanding. Here is a brief summary of the following: Artificial popularization of poplar in the world is more common in Europe, especially in Italy and France, representing the current world advanced level. Disease occurrence is closely related with climatic conditions. If the rough to Paris as France’s northern and southern climatic boundaries, then roughly north of Paris on behalf of the Nordic type, south of Paris on behalf of southern Europe and the Mediterranean type. However, the climate and humidity of the Po River plain in the northern part of Italy are rather special and differ greatly from the soil in the southern mountainous areas. Therefore, the occurrence of diseases is also slightly different.