广西植物2019，Vol.39Issue(1)：87-97,11.DOI:10.11931/guihaia.gxzw201803033
广西弄岗北热带喀斯特季节性雨林林隙特征与空间分布
Characteristics and spatial distribution of forest gap in a northern tropical karst seasonal rainforest in Nonggang, Guangxi, South China
摘要
Abstract
Forest gap is the dominant form of disturbance in many forest ecosystems.Gaps play an important role in forest helping to maintain forest regeneration and dynamics.Little is known about the gap pattern and characteristics of karst seasonal rain forests.In this study, high-spatial-resolution Worldview-3 satellite imagery was coupled with field data to assess gap disturbance regime and its pattern in a 15 tropical karst seasonal rain forest dynamic plot in Nonggang National Nature Reserve, Guangxi.Total 305 gaps were identified, ranging in size from 10 to 371with mean size 52.3 m2.The canopy gap fraction was 10.6％, and gap density was about 20 per hectare.The spatial pattern of gaps was clustered at scale 0-50 m.Significant association was found between gaps and big trees (DBH≥10 cm), and null associations between gaps and small trees (DBH＜10 cm) and between gaps and standing dead trees.The prevailing ecological factors had different influence on gap distribution and gap characteristics.Convexity, altitude above channel (AAH) and tree species richness had significant effect on the gaps distribution.Gap size was significantly influenced by slope, mean elevation and tree species richness.Gap perimeter was mainly affected by mean elevation, rock-bareness rate (RBR), topographic wetness index (TWI), AAH and tree species abundance.These results indicated that gap disturbance was very frequent in karst seasonal rain forests, and there were topographic differentiation in spatial distribution and characteristics of gaps resulted by the combination effects of unique special karst geological conditions, habitats and the biological characteristics of karst forest.关键词
喀斯特季节性雨林/林隙/空间分布格局/空间关联/生态因子Key words
karst seasonal rain forest/forest gap/spatial pattern/spatial associations/ecological factors分类
农业科技引用本文复制引用
向悟生,李冬兴,王斌,李先琨,郭屹立,文淑均,陆树华,梁士楚..广西弄岗北热带喀斯特季节性雨林林隙特征与空间分布[J].广西植物,2019,39(1):87-97,11.基金项目
国家重点研发计划项目(2016YFC0502405) （2016YFC0502405）
国家自然科学基金(31660130,31760131,31300359,31760141) （31660130,31760131,31300359,31760141）
广西重点研发计划项目(桂科AB16380256) （桂科AB16380256）
