【摘要】 西藏西部高寒地区的珍稀古树具有重要的生态、科研和社会价值，但目前对该区的古树资源本底、生长状况等认识尚不足。该研究运用树木年轮学方法调查了日喀则市昂仁县散生古柏树本底资源，发现了20株散生古柏树，其中一级古树1株、二级古树3株、三级古树16株。古柏树多分布于县域东南部，多白乡和卡嘎镇有13株，达局乡和亚木乡有5株，桑桑镇和雄巴乡仅有2株。窄年轮同步出现在较多古树中且各时期均有，而宽年轮大多集中在1989—2006年。古树年轮中表现的生长平稳期、波动期、抑制期、释放期和生长趋势既有同时性也有差异性。这些结果表明昂仁县古柏树具有“东南河谷多、深山藏散株、寺庙有大树”的分布特点，古柏树在上百年的历史中发展了个体间多种多样应对气候变化和自然干扰的生态韧性。研究结果丰富了西藏西部古柏树本底资源信息，为古树名木建档工作提供了数据支撑。更多还原

【Abstract】 Rare ancient trees in the alpine region of western Xizang possess significant ecological, scientific and social value, However, current knowledge about the baseline information and growth conditions of these resources remains insufficient. Using dendrochronological method, this paper investigated the baseline resources of scattered ancient cypresses in Angren county, Rikaze. A total of 20 scattered ancient cypresses were discovered, including 1 in first-class protection, 3 in second-class and 16 in third-class. The majority of these trees are distributed in the southeastern part of the county, with 13 in Duobai and Kaga town, 5 in Daju and Yamu town, and only 2 in Sangsang and Xiongba town. Narrow rings occurred synchronously in many cypresses across different periods, whereas wide rings occurred mostly between 1989 and 2006. The tree ring growth pattern, including stable period, fluctuating period,suppressive period, releasing period and growth trend showed both synchronicity and variability. These results suggested their spatial distribution pattern characterized by a “higher density in southeastern river valleys, scattered individuals in remote mountains,, and large ones near temples”. The ancient cypresses have developed diverse ecological resilience among individuals in response to climatic change and natural disturbances over centuries. The findings have enriched the baseline information about ancient cypresses in western Xizang, providing data support for the archival work of famous and notable trees.更多还原