本项目以对印度季风强弱变化非常敏感的低纬度、低海拔区——云南省腾冲县北海湿地为研究区，以完整覆盖MIS 5阶段和全新世的15万年为研究时段，以已获取的沉积连续、富含植物残体、有火山灰层、磁性较强的38.37 m长的岩芯为研究对象，采用AMS 14C测年、古地磁测年、火山灰与火山岩测年以及光释光测年多种手段相结合的方法，建立精确的年代序列。通过孢粉、炭屑、元素、粒度、磁化率、植硅体、总有机碳、碳酸盐等指标的高分辨率分析，在精确定年与表层孢粉研究基础上，定性、定量重建云南西南部约15万年来高分辨率的古植被、古气候与古季风演化序列，以及古火灾演化历史，进而探讨印度季风的演化规律与驱动机制，以及植被、气候与火之间的相互关系。这将填补典型印度季风区缺乏15万年来高精度定年、高分辨率陆地古气候记录的空白，火演化以及植被、气候与火之间关系研究，将为现代森林经营与管理以及森林防火、用火提供科学依据与参考。

The Beihai wetland in the Tengchong County of Yunnan Province, a low-latitude and low-altitude region which is very sensitive to the variation of intensity of Indian monsoon, is selected as the study area. About 150 ka covering completely MIS 5 and Holocene is selected as the study period. From the region, we collected a 38.37-m-long core. The core is continuously deposited, rich in plant residues, strong magnetism, and with tephra layers. Based on this core, some dating methods such as AMS 14C dating, paleomagnetic dating, volcano ash and volcano rock dating, and OSL dating are combined to establish a precise chronology. Different environmental proxies such as pollen, charcoal, element, grain size, magnetic susceptibility, phytolith, TOC, and carbonate will be analyzed with high resolution. Based on the precise dating and the surface pollen study, ~150 ka high-resolution palaeovegetation, palaeoclimate, and palaeomonsoon evolution sequences and palaeofire history in the southwestern Yunnan Province are reconstructed qualitatively and quantitively. Then the evolution rule and driving mechanism of Indian monsoon, and the correlation between vegetation, climate and fire will be further discussed. The study will make up the blank space which the region affected by Indian monsoon is lack of ~150 ka high-precise dating, and high-resolution terrestrial palaeoclimate record. The study on fire evolution and the correlation between vegetation, climate and fire will provide the scientific basis and reference for the modern forest management, the forest fire prevention, the use of fire.