Dust pollen distribution on a continental scale and its relation to present-day vegetation along north-south transects in east China

A series of dust pollen samples was collected along N-S transects in east China (18°N to 53°N latitudes). Sample sites extend from the cold-temperate zone in the north to the tropical region in the south. Pollen taxa characterize each region and reflect the natural and devastated vegetation as well as corre- sponding climatic zones. The quantitative pollen data can be used to estimate the spatial distribution of planted and introduced species. Valuable information of human disturbance of the natural forest is evaluated by quantitative comparison between dust pollen and in-situ pollen of protected forest. In addition, percentages of grass pollen vary regularly from north to south that is consistent with spatial distribution of net primary productivity in east China. Among all grasses, Artemisia and the Gramineae carry the clearest signal: their ratio increases northwards and therefore represent a suitable and con- venient tool for palaeoclimate reconstructions.

中国及其邻区现代孢粉数据：空间分布特征和定量古环境重建中的应用

现代孢粉数据及其关联的古环境信息是第四纪孢粉定量气候重建的基础,本研究对中国及其邻近区域现代孢粉进行了补充采样与分析鉴定和数据收集,初步建立了较大尺度的东亚地区孢粉数据库。该数据库现拥有2858个现代样点和孢粉谱数据,覆盖的国家和地区包括中国、蒙古、日本、越南、柬埔寨、泰国、印度、俄罗斯远东部分地区以及东海和南中国海海域。数据库的孢粉种类数为729个,本文对48个代表性的孢粉类型进行了等值线作图,其结果清晰显示出绝大部分孢粉的地理分布范围明确,与相关植被和气候具有紧密的关系。本研究对该数据集进行了最佳类比法重建气候可行性的验证,结果表明无论年降雨和年平均温度,重建结果都具有较高的可信度,与观测值的相关系数均达到0.9以上。该研究首次展示覆盖东亚区域的大陆尺度孢粉空间分布特征,并检验了数据资料用于气候重建的可行性,本研究提供的现代孢粉数据将有利于提高第四纪孢粉定量气候解释的研究水平。