每次看到PNAS的文章都会眼前一亮，刚才也不例外。我注意到了一篇中科院刚发表的PNAS研究论文，心中一喜，我们大陆又产生了一篇PNAS了？但看到那一大串陌生的作者姓名时才发现，没有一个是中国人！虽然说，科学没有国界，但没有中国人的中国论文确实着实使我惊诧良久。

我查了一下第一作者兼通讯联系人Slik JW的基本信息，他是西双版纳植物园的全职人员，2008年在Conservation Biology发表的一篇文章作者同样也都是“外国人”。引用科学网报道的一句话：Ferry J. W. Slik博士现为版纳植物园全职研究人员，主要从事东南亚地区低地雨林树种多样性及其分布格局与环境变量（干旱、火灾和人工砍伐）之间的关系、树种多样性理论和统计问题的研究。Slik博士希望自己能培养一批来自世界各地甚至遍布整个东南亚地区的学生，为东南亚地区热带雨林的保护作出贡献。

突然发现我们真够大度的，可以很大方出资培养国际人才了，扩充自己联合军的地盘、巩固“酋长”地位。或许我多想了，但愿这种“引进”人才的方式最终能转为“内销”。

相关报道：

中科院外籍研究员新成果登前沿期刊

依据木材密度划分热带雨林保护区

PNAS论文摘要：

Proc Natl Acad Sci U S A. 2011 Jul 26;108(30):12343-7. Epub 2011 Jul 11.

Slik JW, Aiba S, Bastian M, Brearley FQ, Cannon CH, Eichhorn KA, Fredriksson G, Kartawinata K, Laumonier Y, Mansor A, Marjokorpi A, Meijaard E, Morley RJ, Nagamasu H, Nilus R, Nurtjahya E, Payne J, Permana A, Poulsen AD, Raes N, Riswan S, van Schaik CP, Sheil D, Sidiyasa K, Suzuki E, van Valkenburg JL, Webb CO, Wich S, Yoneda T, Zakaria R, Zweifel N.

Chinese Academy of Sciences, Menglun, Yunnan, China. ferryslik@hotmail.com

The marked biogeographic difference between western (Malay Peninsula and Sumatra) and eastern (Borneo) Sundaland is surprising given the long time that these areas have formed a single landmass. A dispersal barrier in the form of a dry savanna corridor during glacial maxima has been proposed to explain this disparity. However, the short duration of these dry savanna conditions make it an unlikely sole cause for the biogeographic pattern. An additional explanation might be related to the coarse sandy soils of central Sundaland. To test these two nonexclusive hypotheses, we performed a floristic cluster analysis based on 111 tree inventories from Peninsular Malaysia, Sumatra, and Borneo. We then identified the indicator genera for clusters that crossed the central Sundaland biogeographic boundary and those that did not cross and tested whether drought and coarse-soil tolerance of the indicator genera differed between them. We found 11 terminal floristic clusters, 10 occurring in Borneo, 5 in Sumatra, and 3 in Peninsular Malaysia. Indicator taxa of clusters that occurred across Sundaland had significantly higher coarse-soil tolerance than did those from clusters that occurred east or west of central Sundaland. For drought tolerance, no such pattern was detected. These results strongly suggest that exposed sandy sea-bed soils acted as a dispersal barrier in central Sundaland. However, we could not confirm the presence of a savanna corridor. This finding makes it clear that proposed biogeographic explanations for plant and animal distributions within Sundaland, including possible migration routes for early humans, need to be reevaluated.