摘要
全球变暖严重影响着草地生态系统碳氮循环,了解高寒草地生态系统碳氮循环对合理利用有限的草地资源有着极为重要的意义。为了探索全球气候变暖的背景下草地生态系统碳氮循环过程,本文采用开顶式增温小室(Open top champers,OTCs)连续四年模拟增温,对青藏高原高寒草地生态系统碳库(植物生物量碳库、土壤有机碳库和土壤微生物生物量碳库)动态变化及氮库(植物生物量氮库、土壤有机氮库和土壤微生物生物量氮库)动态变化进行研究。结果显示:模拟增温后,表层土壤年均温度增加了2.50℃,底层土壤年均温度增加了1.36℃。增温处理下植物-土壤-微生物生物量碳含量均高于对照,且土壤微生物生物量碳含量显著高于对照(P<0.05)。模拟增温处理下植物氮含量显著高于对照(P<0.05)。而土壤氮含量与微生物生物量氮含量均低于对照,差异不显著,说明高寒草甸碳氮对温度的响应较为明显。
Global warming seriously affects the carbon and nitrogen cycled ecosystems.Understanding the carbon and nitrogen cycle of alpine grassland ecosystems is extremely important for the rational use of limited grassland resources.To explore the carbon and nitrogen cycle of grassland ecosystems in the context of global warming,this paper uses OTC(Open top champers)warming chambers to simulate warming for four consecutive years,and evaluates the carbon pools of alpine grassland ecosystems(plant biomass carbon pools,soil organic carbon pools on the Qinghai-Tibet Plateau and soil microbial biomass carbon pool)dynamic changes and nitrogen pool(plant biomass nitrogen pool,soil organic nitrogen pool and soil microbial biomass nitrogen pool)dynamic changes.The results showed that:After the simulated temperature increased,the average annual temperature of the surface soil increased by 2.50℃,and the average annual temperature of the bottom soil increased by 1.36℃.The plant-soil-microbial biomass carbon content under warming treatment was hiher than that of the control,and the soil microbial biomass carbon content was significantly higher than that of the control(P<0.05).The nitrogen content of plants under the simulated warming treatment was significantly higher than that of the control(P<0.05).The soil nitrogen content and microbial biomass nitrogen content were lower than that of the control,although the difference was not statistically significant.
作者
姚世庭
芦光新
周华坤
张海娟
颜珲璘
王军邦
YAO Shi-ting;LU Guang-xin;ZHOU Hua-kun;ZHANG Hai-juan;YAN Hui-lin;WANG Jun-bang(College of Agriculture and Animal Husbandry, Qinghai University, Xining, Qinghai Province 810016, China;Northwest Plateau Institute of Biology, Chinese Academy of Sciences, Xining, Qinghai Province 810001, China;Key Laboratory of Restoration Ecology in Cold Regions of Qinghai Province, Xining, Qinghai Province 810001, China;Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China)
出处
《草地学报》
CAS
CSCD
北大核心
2021年第S01期218-224,共7页
Acta Agrestia Sinica
基金
高寒草地土壤微生物漆酶基因多样性及其对土壤有机质转化机理的研究(31860103)
高寒草地耐低温产漆酶真菌对珠芽蓼(Polygonum viviparum)多酚类化合物降解作用的研究(31460152)
青藏高原耐低温纤维素分解真菌多样性的研究(41261064)资助。
关键词
高寒草甸
模拟增温
碳循环
氮循环
Alpine meadow
Simulated warming
Carbon cycle
Nitrogen cycle
