拉萨河流域河岸带湿地土壤CO_(2)排放对变温的响应  

Response of soil CO_(2) emission to temperature variation in riparian wetland of Lhasa River Basin

作　　者：潘永泰 刘贵华[3] 刘星 于孟飞[5] 马琳[3] PAN Yongtai;LIU Guihua;LIU Xing;YU Mengfei;MA Lin(Research Center for Ecology and Environment of Qinghai-Tibetan Plateau,Tibet University,Lhasa 850000,China;College of Science,Tibet University,Lhasa 850000,China;Wuhan Botanical Garden&Key Laboratory of Aquatic Botany and Watershed Ecology,Chinese Academy of Sciences,Wuhan 430074,China;College of Life Science,Wuhan University,Wuhan 430000,China;College of Life Sciences,South-Central Minzu University,Wuhan 430074,China)

机构地区：[1]西藏大学青藏高原生态与环境研究中心,拉萨850000 [2]西藏大学理学院,拉萨850000 [3]中国科学院武汉植物园&生植物与流域生态重点实验室,武汉430074 [4]武汉大学生命科学学院,武汉430000 [5]中南民族大学生命科学学院,武汉430074

出　　处：《中南民族大学学报（自然科学版）》2023年第1期26-35,共10页Journal of South-Central University for Nationalities：Natural Science Edition

基　　金：国家自然科学基金资助项目(31971479)。

摘　　要：通过对26份青藏高原拉萨河流域湿地土壤样品的分析,发现土壤有机碳和总氮呈现中游西部流域低东部流域高,汇入雅鲁藏布江口较低,源头彭措较高;土壤中CO_(2)排放速率随着培养温度的升高而增加,下游各位点CO_(2)平均排放速率显著高于中游和上游.土壤呼吸温度敏感性(Q_(10))在流域内汇入口和下游左侧流域(堆龙曲)表现与排放速率相似的特征,更好地突出了在下游右侧流域(墨竹工卡流域)和上游流域(麦地藏布流域)的土壤温度敏感性较低的特征.通过地理探测器探寻气象、植被、地理、双评价、生化、人口经济6个圈层对Q_(10)值的不同影响,结果表明:气象(降雨、太阳辐射)、地理(流域、海拔)、生化、人口经济等因素对Q_(10)有较强影响,其中降雨(80.76%)和太阳辐射(74.68%)在气候因素中占主要影响;流域(88.95%)分布的q值在地理因素中起到重要作用;生化因子中,各检测指标对Q_(10)的影响排序为OC(88.16%)>MBC/OC(78.72%)>MBN/TN(77.30%)>TN(72.37%)>C/N(35.14%)>MBN(8.70%)>MBC(6.80%)>MBC/MBN(5.89%);降雨侵蚀归一化指数对Q_(10)的影响达到了79.67%.此外,任何两种因子对Q_(10)值的交互作用都要大于单一因素的单独作用.地理因素中流域与其他因素间的交互作用对Q_(10)的影响最为强烈(0.90~0.96),生化因素OC与其他因素间的交互作用对Q_(10)较强烈(0.89~0.94),气象因素中降雨和太阳辐射与其他因素交互作用对Q_(10)的影响更加不可忽略.26 soil samples from the riparian wetlands of the Lhasa River Basin in Qinghai-Tibetan Plateau were analyzed.The results showed that soil organic carbon and total nitrogen were lower in the western basin of the middle reaches and higher in the eastern basin,lower in the mouth of Yarlung Zangbo River and higher in the source of Pengtso River.The CO2 emission rate in soil increased with the increase of culture temperature,and the average CO2 emission rate in the downstream was significantly higher than that in the middle and upper reaches.Soil respiration temperature sensitivity(Q_(10))values in the mouth of Lhasa river basin and the left basin in the lower reaches(Duilongqu)showed similar characteristics with the emission rate,which better presented the characteristics of low soil temperature sensitivity in the right basin of the downstream(Mozhugongka Basin)and the upper basin(Maidi Zangbu Basin).The effects of meteorological,vegetational,geographical,dual evaluation,biochemical,demographic factors on Q_(10) were explored by geographic detector.The results showed that the meteorology(rainfall,solar radiation),geography(watersheds,altitude),biochemistry and population economy had a strong effect on Q_(10).Among them,rainfall(80.76%)and solar radiation(74.68%)accounted for the main factors affecting climate.The q value of the distribution(88.95%in the basin)played an important role in geography.Among the biochemical factors,the influence of each detected index on Q_(10) was ranked as:OC(88.16%)>MBC/OC(78.72%)>MBN/TN(77.30%)>TN(72.37%)>C/N(35.14%).The effect of rainfall erosion normalized index on Q_(10) reached 79.67%.In addition,the interaction of any two factors on the Q_(10) value was greater than the interaction of a single factor alone.The interaction between watersheds in geographical factors and other factors on Q_(10) was the strongest(0.90−0.96),the interaction between OC in biochemical factors and other factors was stronger on Q_(10)(0.89−0.94),the interaction of rainfall,solar radiation in meteorolog

关 键 词：变温 CO_(2)通量 土壤呼吸温度敏感性(Q_(10)) 拉萨河流域 地理探测器 

分 类 号：X825[环境科学与工程—环境工程] P951[天文地球—自然地理学]