EVIDENCE FOR THE PERSISTENCE OF WILD GINKGO BILOBA (GINKGOACEAE) POPULATIONS IN THE DALOU MOUNTAINS, SOUTHWESTERN CHINA
EVIDENCE FOR THE PERSISTENCE OF WILD GINKGO BILOBA (GINKGOACEAE) POPULATIONS IN THE DALOU MOUNTAINS, SOUTHWESTERN CHINA
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DOI：
10.3732/ajb.1200168
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发表时间：
2012-08-01
影响因子：
3
通讯作者：
Wu, Zhao-Lu
中科院分区：
文献类型：
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作者：
Tang, Cindy Q.;Yang, Yongchuan;Wu, Zhao-Lu
研究结论：中国野生银杏种群的可能持续性一直存在争议，但从未得到科学证实。我们验证了我们的假设，即大娄山现存的银杏种群（中国西南部）代表了原始天然银杏范围的片段，并提供了一系列有关活化石银杏的历史，史前，生态学和人类文化中的地位的相关观点-这一高度重视的物种的所有重要方面。我们分析了研究区的植被，确定了银杏种群的年龄结构，并将其与现有的化石记录进行了比较。作为支持材料，我们还检查了记录，缺乏人类存在的世纪中期之前，在该地区，当地人民的信念，有关森林的保护和现有的遗传研究。biloba.目前的种群被发现在类似于化石银杏的栖息地，像今天一样，有利于岩石裂缝。女性与男性的比例为3：2。许多树木的估计年龄表明，银杏在人类定居之前就存在于这一地区，由于传统信仰，这一地区的土著人民不太可能种植银杏。我们的研究结果与现有的遗传学研究一致，表明这些山脉是G。biloba.Conclusions:佐证的证据证实了这一发现，即这些种群代表了大娄山山谷和较低山坡上原始天然银杏的碎片。
Premise of the study: The possible persistence of wild Ginkgo biloba populations in China has long been debated but never scientifically confirmed. We test our hypothesis that the extant Ginkgo populations in the Dalou Mountains (SW China) represent fragments of the original natural Ginkgo range and offer a range of pertinent perspectives on the living fossil Ginkgo's history, prehistory, ecology, and place in human culture-all important aspects of this highly valued species.Methods: We analyzed the vegetation of the study area, determined the population age structure of Ginkgo, and compared it to existing fossil records. For supporting material, we also examined records of the lack of human presence before the mid-17th century in the area, the local people's beliefs regarding preservation of the forests and existing genetic studies.Key results: Current species composition of Ginkgo forests in the Dalou Mountains agrees closely with floristic assemblages from fossil records bearing G. biloba. Current populations are found in habitats similar to those of fossil Ginkgo, which, as today, favored rock crevices. Female to male ratios are 3:2. Estimated ages for many of the trees show that Ginkgo was present in this area prior to human settlement and indigenous peoples of this area are unlikely to have planted Ginkgo because of traditional beliefs. Our results agree with existing genetic studies that show that these mountains were glacial refugia for G. biloba.Conclusions: The corroborative evidence confirms the finding that these populations represent fragments of the original natural Ginkgo in the valley and lower mountain slopes of the Dalou Mountains.