近來，中科院華南植物園保育生態(tài)學(xué)研究組李林博士研究生在葉萬輝,、黃忠良等研究員及加拿大Alberta大學(xué)何芳良教授指導(dǎo)下,，以廣東鼎湖山森林生態(tài)系統(tǒng)國家野科學(xué)觀測站的南亞熱帶常綠闊葉林20公頃監(jiān)測樣地為基地，采用國際先進的O-ring統(tǒng)計方法,，分析了樣地中多度大于10的所有物種進行分布格局,，討論了各種導(dǎo)致現(xiàn)有格局產(chǎn)生的原因，并與熱帶地區(qū)的研究結(jié)果進行比較,，從而得出了南亞熱帶常綠闊葉林物種的普遍分布格局,，格局變化的規(guī)律，以及產(chǎn)生這種格局的主要機制,。
經(jīng)過長期研究發(fā)現(xiàn)：聚集分布在樣地中起到絕對優(yōu)勢,，物種的聚集比例隨著尺度的增加而下降,；顯著聚集比例從豐富種、中間種,，再到偶見種依次下降,，偶見種比常見種更加聚集，大徑級物種的聚集程度下降,；種子特征決定了物種的空間分布格局,，種子擴散模式影響到物種的空間分布，由動物和風(fēng)力兩種方式共同傳播的物種,，聚集程度小于分別由動物或風(fēng)力傳播的物種,。綜合以上結(jié)果，得出了如下結(jié)論：種子分散限制,、自疏作用和生境異質(zhì)性是導(dǎo)致樣地中物種現(xiàn)存格局的主要因素,，也是維持南亞熱帶常綠闊葉林物種共存的主要機制。
其相關(guān)研究成果已發(fā)表在世界著名科學(xué)期刊Oikos上,。（生物谷Bioon.com）
生物谷推薦原始出處：
Oikos 2 Jul 2009 DOI:10.1111/j.1600-0706.2009.17233.x
Community differentiation on landscapes: drift, migration and speciation
Xin-Sheng Hu, Fangliang He and Stephen P. Hubbell,
Correspondence to X.-S. Hu and F. He, Dept of Renewable Resources, 751 General Service Building, Univ. of Alberta, Edmonton, Alberta, T6G 2H1, Canada. – S. P. Hubbell, Dept of Ecology and Evolutionary Biology, 621 Charles E. Young Drive, Univ. of California, Los Angeles, CA 90095-1601, USA, and Smithsonian Tropical Research Inst., Unit 0948, APO AA 34002-0948, Panama.
Theories of the differentiation of ecological communities on landscapes have typically not considered evolutionary dynamics. Here we analytically study the expected differentiation among local communities in a large metacommunity, undergoing speciation, ecological drift and intercommunity dispersal, in the context of neutral theory. We demonstrate that heterogeneity in species diversity and abundance arises among communities when local communities are small and intercommunity migration is infrequent. We propose a new measure to describe community differentiation, defined as the average correlation or the average probability (Cst) that two randomly sampled individuals of the same species within local communities are from the same ancestor. The effects of driving forces (migration, mutation, and ecological drift) are incorporated into the two-level hierarchical community structure in a finite island model of neutral communities. Community differentiation can increase the effective metacommunity size or the Hubbell's fundamental species diversity in the metacommunity by a factor (1?Cst)?1. Significant community differentiation arises when Cst≠0. Intercommunity migration promotes species diversity in local communities but reduce species diversity in the metacommunity. In either the finite or infinite island case, one can estimate the number of intercommunity migrants by using multiple local community datasets when the speciation is negligible in the neutral local communities, or by using the metacommunity dataset when the speciation is included in the local neutral communities. These results highlight the significance of the evolutionary mechanisms in generating heterogeneous communities in the absence of complicated ecological processes on large landscapes.
