冻土退化致青藏高原热融湖塘扩张|chinese国产人妖ts

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  中新社西宁8月1日电 (孙睿 赵海梅)记者1日从青海省气象局获悉,青海省气象科研人员日前对三江源海拔3600米以上核心区开展高寒湿地科考,结果显示:受气候变暖影响,青藏高原冻土退化促使热融湖塘发育扩张,但2024年三江源国家公园整体仍维持净碳汇状态。

  三江源地处地球“第三极”青藏高原腹地,是长江、黄河、澜沧江三大江河的发源地,是中国及东南亚地区重要淡水供给地,其生态系统服务功能、自然景观、生物多样性具有重要保护价值。

  青海省气象科学研究所业务科科长、高级工程师颜玉倩介绍,本次科考针对湖泊、河流、热融湖塘等典型湿地,采用“天空地”一体化监测技术——通过无人机航测洮河源、隆宝沼泽等湿地高分辨率影像,结合地面采样与卫星遥感,同步收集植被光谱数据,同时追踪热融湖塘发育状况。

  热融湖塘是冻土融化引发地表塌陷、水分汇聚形成的塘洼。科考发现,气候变暖导致青藏高原多年冻土与季节冻土退化,热喀斯特作用加剧,推动热融湖塘扩张。这一变化不仅影响湿地面积动态,更关联区域碳循环——冻土退化会释放碳,但监测数据显示,三江源国家公园通过植物固碳、土壤储存等方式,吸收碳总量仍大于排放量,维持“净碳汇”状态。(完)

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