根据气候相似性原理，利用最优动态聚类的方法，给出马铃薯种植的风险区划。
Using the climate comparability theory and the optimal dynamic cluster method, the paper puts forward the regional division of potato production risk.
依据自然生态相似性引种原理和科学利用气候转暖升高的自然条件的观点，开展石楠在北京地区的引种和示范应用。
The introduction and demonstrated application of Photinia serrulata, a kind of evergreen broadleaf plant originating from the central and southern area of China, in Beijing parks are summarized.
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