江西三清山香果树群落乔木层主要种群生态位

The Niche of the Main Populations in the Arbor Layer of Emmenopterys henryi Community in Mt.Sanqingshan,Jiangxi Province

2019年5月在三清山香果树分布比较典型的壁玉岩和风门设置2个具有代表性的样地,应用相邻格子法进行调查获取野外资料,对香果树群落乔木层的15个主要种群的生态位特征进行研究。结果显示:香果树、拟赤杨、山桐子和华桑的生态位宽度较大,野桐、白背麸杨、浙江大青、红楠、三尖杉和浙江新木姜子的生态位宽度较小;山樱与豹皮樟,山樱与白背麸杨种对生态位重叠最大;香果树与三尖杉种对最小。表明生活型相同的种群生态位宽度越大,适应环境的能力就越强,占据资源的能力也就越强;生态位重叠越大,种对的生态位相似性越大,资源利用的相似程度越强;种对生态位宽度大,一般生态位重叠就大,种对生态位宽度小,在相同或相似环境条件下的生态位重叠也较大,种对生态位宽度差异大,生态位重叠较小。

The two representative sample plots were established in Biyuyan and Fengmen of Mt.Sanqingshan in May 2019,field data were obtained by tally with contiguous grid quadrate method.The niche characteristics of 15 tree specieses of Emmenopterys henryi community in Mt.Sanqingshan were analyzed.The results showed that the niche breadth of Emmenopterys henryi,Alniphyllum fortunei,Idesia polycarpa and Morus cathayana were bigger.Which of Mallotus japonicus var.floccosus,Rhus hypoleuca,Clerodendrum kaichianum,Machilus thunbergii,Cephalotaxus fortunei and Neolitsea aurata var.chekiangensis were smaller.The niche overlap of Cerasus serrulata and Litsea coreana var.sinensis,Cerasus serrulata and Rhus hypoleuca were the biggest among all of twin species,Emmenopterys henryi and Cephalotaxus fortunei were the least.The wider of niche breadth in the same life-form,the higher capability of adapting environment,the more powerful capability of utilization resources.The niche overlap among species was higher,the niche similarity between species was greater,similarity of utilization resources was more powerful.The niche overlap between species with broad niche breadth was generally greater.which between species with narrow niche breadth was greater in the same or similar environment requirements.which between species with broad and narrow niche breadth was smaller.