长期增温和围栏封育对高寒草原土壤微生物残体碳积累的影响不显著  

Long-term warming and fencing had no significant effects on the carbon accumulation from soil microbial necromass in alpine grassland

作　　者：种碧莹 金显玲 徐海燕[1] 吴晓东 周文婷 梁冰妍 甘子鹏 张婷 康国慧 殊秋丽 陈卓 刘桂民[1] CHONG Biying;JIN Xianling;XU Haiyan;WU Xiaodong;ZHOU Wenting;LIANG Bingyan;GAN Zipeng;ZHANG Ting;KANG Guohui;SHU Qiuli;CHEN Zhuo;LIU Guimin(School of Environmental and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;Cryosphere Research Station on the Qinghai-Tibet Plateau,State Key Laboratory of Cryospheric Science,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;Haibei Animal Husbandry Meteorological Experimental Station,Xihai Town 810299,Qinghai,China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070 [2]中国科学院西北生态环境资源研究院,冰冻圈科学国家重点实验室,藏北高原冰冻圈特殊环境与灾害国家野外科学观测研究站,甘肃兰州730000 [3]青海省海北牧业气象试验站,青海西海镇810299

出　　处：《冰川冻土》2023年第4期1391-1400,共10页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(42261025,41861011)资助。

摘　　要：在气候变暖背景下,围栏封育是常见的草地生态系统管理手段,明确变暖和围封对土壤有机碳的积累过程,对于认识草地生态系统碳源汇效应十分重要。本文以氨基糖为有机碳组分的标识物表征死亡的微生物量,选择连续15年增温和围栏封育处理下的样地,分析增温和围栏封育对高寒草原区微生物残体碳积累的影响。结果表明:相比对照,增温+围封和围封处理细菌、真菌来源碳无显著差异,但细菌残体碳比真菌残体碳对土壤有机碳相对贡献大;增温+围封和围封处理与对照相比,氨基糖总量影响不显著,但是显著降低了土壤中微生物碳长期周转,短期周转不显著;总氨基糖、真菌来源碳、细菌来源碳与电导率、含水率、土壤有机碳(SOC)、全氮(TN)显著正相关。综上所述,细菌残体碳比真菌残体碳对土壤有机碳相对贡献大,增温和围栏封育对微生物残体碳影响不显著。In the context of climate warming,fencing is a common management method for grassland ecosys⁃tems.Understanding the effects of warming and fencing on soil organic carbon accumulation is very important to evaluate the carbon source and sink roles of grassland ecosystems.In this study,using the amino sugars as bio⁃markers,we investigated the effects of long-term warming and fencing on necromass accumulation in an alpine grassland.We collected soil samples from plots after 15 years treatment of warming and fencing.The results showed that:(1)Compared to the control,there was no significant difference in the carbon source derived from bacteria and fungi between the warming+enclosure and enclosure treatments,but bacterial residual carbon con⁃tributed more to soil organic carbon than fungal residual carbon.(2)Compared to the control,there was no sig⁃nificant effect on the total amount of amino sugars between the warming+enclosure and enclosure treatments,but significantly reduced the long-term turnover of microbial carbon in the soil,and the short-term turnover was not significant.(3)Total amino sugars,fungal necromass carbon and bacterial necromass carbon were signifi⁃cantly positively correlated with conductivity,moisture content,soil organic carbon(SOC),and total nitrogen(TN).In summary,bacterial necromass carbon contributed higher proportions to soil organic carbon than fun⁃gal necromass carbon,while 15 years warming and fencing had no significant effects on microbial necromass carbon in soils.

关 键 词：高寒草原 围栏封育 增温 微生物残体碳 相关性分析 

分 类 号：S154.1[农业科学—土壤学]