CAJ | 학술논문

采用实地调查和查阅文献资料相结合的方法，对河南省新乡市园林植物区系与其他5市（石家庄、信阳、成都、昆明、湛江）园林植物区系特征进行比较分析，结果表明，新乡市园林植物共有74科161属311种（包括变种和变型），其中裸子植物共有5科11属23种，被子植物有69科150属288种；13个优势属中有10属是北温带分布类型，表明本区的种子植物区系具有明显的北温带性质。根据热带成分（ R）属与温带成分（ T）属的比值大小对新乡市与其他5市的园林植物区系进行比较，结果显示：随纬度的升高，R/T值呈下降趋势，即热带性质降低，温带性质加强，表现出明显的纬度地带性规律；总体上，随纬度升高，物种属数减少。
채용실지조사화사열문헌자료상결합적방법，대하남성신향시완림식물구계여기타5시（석가장、신양、성도、곤명、담강）완림식물구계특정진행비교분석，결과표명，신향시완림식물공유74과161속311충（포괄변충화변형），기중라자식물공유5과11속23충，피자식물유69과150속288충；13개우세속중유10속시북온대분포류형，표명본구적충자식물구계구유명현적북온대성질。근거열대성분（ R）속여온대성분（ T）속적비치대소대신향시여기타5시적완림식물구계진행비교，결과현시：수위도적승고，R/T치정하강추세，즉열대성질강저，온대성질가강，표현출명현적위도지대성규률；총체상，수위도승고，물충속수감소。
Based on the field survey and the known dada ,the flora of the landscape plants in Xinxiang and other 5 cities were ana-lyzed.The result showed that there were about 311 species of landscape plant ( including varieties and forms ) belonging to 161 gene-ra in 74 families in Xinxiang City ,23 species belonging to 11 genera and 5 families were gymnosperm ,as well as 288 species of angi-osperm belonging to 150 genera and 69 families.There were 10 North Temperate genera in the 13 dominant genera ,which showed that the north temperate elements were dominant of the floristic composition.According to the ordination of R/T( tropic genera/tem-perate genera),the ratio of R/T took on a descendant trend as the increasing of latitude to the data of 6 areas,and an apparent rule on latitude zonation of floristic variation was expressed.As a whole,with the increasing latitudes the number of genera declined.