为了解南宁市武鸣区古树资源现状,探究其空间分布和影响古树分布的地理因素,结合实地调查和地理信息系统(Geographic Information System,GIS)技术,分析武鸣区古树资源和空间分布特征.结果表明,武鸣区共有古树2 538株,隶属于27科46属55种;优势科为无患子科(Sapindaceae)、桑科(Moraceae)、桃金娘科(Myrtaceae)、壳斗科(Fagaceae)和樟科(Lauraceae);优势属为龙眼属(Dimocarpus)、榕属(Ficus)、蒲桃属(Syzygium)和樟属(Cinnamomum);优势种为龙眼(Dimo-carpus longan)、高山榕(Ficus altissima)、榕树(Ficus microcarpa)、乌墨(Syzygium cumini)和樟(Cinnamomum camphora).三级古树最多,特级古树最少.大多数古树生长状况良好,94.84%为正常株.特级古树主要分布在武鸣区东部和西部;一级古树主要分布在武鸣区外围;二级、三级和准古树在所有乡镇均有分布.古树分布呈较强空间集聚性,有1个高密度区中心和4个次密度区中心;城厢镇古树最多,甘圩镇古树最少.耕地中分布的古树最多,其次为林地;建设用地和水域中分布的古树均较少;草地和裸地中均无古树分布.古树喜分布在阳坡、缓坡和无坡向区域.赤红壤中分布的古树最多,其次为水稻土.武鸣区古树资源丰富且极具价值;古树整体生长状况良好,需对其进行定期调查和评估及科学养护.
Characteristics of Old Tree Resources and Spatial Distributions in Wuming District,Nanning
In order to understand current status of old tree resources in Wuming district,Nanning,and to ex-plore spatial distributions of old trees and geographical factors influencing distributions of old trees,combining field survey and geographic information system(GIS)technology,characteristics of old tree resources and spa-tial distributions in Wuming district were analyzed.Results showed that there were a total of 2 538 old trees in Wuming district,belonging to 27 families,46 genera and 55 species.Dominant families were Sapindaceae,Moraceae,Myrtaceae,Fagaceae and Lauraceae.Dominant genera were Dimocarpus,Ficus,Syzygium and Cinna-momum.Dominant species were Dimocarpus longan,Ficus altissima,Ficus microcarpa,Syzygium cumini and Cinnamomum camphora.Number of tertiary old trees was the most,and number of super old trees was the least.Most old trees were in good health,with 94.84%classified as healthy.Super old trees mainly distributed in east and west of Wuming district.First old trees mainly distributed in peripheries of Wuming district.Secondary old trees,tertiary old trees and Quasi old trees distributed in all townships of Wuming district.Spatial distributions of old trees showed strong spatial clustering,with one high density area center and four secondary density area centers.Number of old trees in Chengxiang town was the most,and number of old trees in Ganxu town was the least.Number of old trees in cultivated land was the most,followed by forest land.Number of old trees in con-struction land and water were less.There were no old trees in grassland and bare land.Old trees prefered areas with sunny slopes,gentle slopes and no slopes.Number of old trees in ferralitic soil was the most,followed by paddy soil.Old tree resources in Wuming district were rich and valuable.General growth status of old trees was good,which should be investigated and evaluated regularly,and conserved scientifically.
old tree resourcespatial distributionGIS technologyWuming district
国家科技期刊平台
NSTL
万方数据
