【摘要】 采用Hegyi单木竞争指数模型对广东省东北部马尾松-木荷天然混交林内主要组成树种的种内与种间竞争关系进行定量分析,并讨论了不同调查时间竞争强度的动态变化。结果表明:林分中主要树种所受的竞争压力依次为:华润楠>木荷>红锥>马尾松>湿地松。在两次调查中,红锥、马尾松和木荷的竞争指数显著增大,以华润楠所受的竞争强度最大。不同树种间的种内及种间竞争强度均存在极显著差异,调查时间对种间竞争强度有显著影响。5年间,红锥受到的种内竞争压力迅速增大。华润楠所受的种间竞争压力在两次调查中均最大。当前林分中主要树种所受的种内竞争压力依次为:红锥>木荷>马尾松>华润楠>湿地松;种间竞争压力依次为:华润楠>红锥>木荷>马尾松>湿地松。华润楠和湿地松的种内与种间竞争压力呈现显著差异,其所受的竞争压力主要来自于种间竞争。而华润楠、马尾松和木荷的种内竞争与种间竞争强度未表现出显著差异,说明其受到的种内与种间竞争压力均衡。更多还原

【Abstract】 The main tree species’ intra-specific and inter-specific competition relations of Pinus massoniana and Schima superba natural mixed forests in the northeast of Guangdong Province were quantitatively analyzed by using Hegyi individual tree competition index model,and the dynamic changes of the intra-specific and inter-specific competition intensity among major trees species in P.massoniana and S.superba mixed forests were studied during different surveys stages.The results show that the two investigations,the competition indexes of Castanopsis hicklii,P.massoniana and S.superba increased significantly,the competition intensity of Machilus chinensis was the biggest of all studied species,the order of the competition intensity at the community level was: M.chinensis> S.superba> C.hicklii> P.massoniana> P.elliotii;there were highly significant differences of intraspecific and interspecific competition intensity between different tree species,the inter-specific competition intensities at different investigation stages were significantly different;the intra-specific competition intensity of C.hicklii increased rapidly between the two investigations(five years),the inter-specific competition intensity of M.chinensis was the biggest in the two investigations;the order of the intra-specific competition intensity of the main tree species according to the last investigation was: C.hicklii>S.superba>P.massoniana>M.chinensis>P.elliotii,that of the interspecific was: M.chinensis> C.hicklii> S.superba> P.massoniana> P.elliotii.There were significant differences between intraspecific and interspecific competition intensity of M.chinensis and P.elliotii,indicating the competition stress of those species mainly came from the competition of other tree species.At the same time,the differences were not significant of the other species,which means that the intraspecific and interspecific competition of these species were in balance state.更多还原