冻融作用对土壤可溶性碳氮和微生物量碳氮含量影响的荟萃分析  

A Meta-analysis of the Effects of Freezing and Thawing on Soil Dissolved Carbon and Nitrogen and Microbial Biomass Carbon and Nitrogen Contents

作　　者：崔乔 李宗省 张百娟 赵越 南富森 CUI Qiao;LI;Zongxing;ZHANG Baijuan;ZHAO Yue;NAN Fusen(Key Laboratory of Ecohydrology of Inland River Basin/Gansu Province Qilian Mountain Eco-environmental Research Center/Northwest Institute of Eco-environment and Resources,Chinese Academy Sciences,Lanzhou 730000,P.R.China;University of Chinese Academy of Sciences,Beijing 100049,P.R.China)

机构地区：[1]中国科学院西北生态环境资源研究院/内陆河流域生态水文重点实验室/甘肃省祁连山生态研究中心,甘肃兰州730000 [2]中国科学院大学,北京100049

出　　处：《生态环境学报》2022年第8期1700-1712,共13页Ecology and Environmental Sciences

基　　金：国家重点研发计划项目(SQ2019YFC050024-01);第二次青藏高原综合科学考察研究项目(2019QZKK0405);甘肃省创新群体项目(2021274);陇原青年创新创业团队项目(2021012)。

摘　　要：土壤中的活性碳氮作为土壤碳氮库的重要组成部分,是生态系统碳氮循环过程中的重要元素。冻融作用对高纬度和高海拔地区生态系统的土壤活性碳氮含量影响深刻,且气候变化将调控冻融作用对土壤碳氮的影响。然而,针对冻融作用对气候变化的响应机制的研究较少。为揭示气候变化背景下冻融作用对土壤中活性碳氮含量的影响机制,运用已有的相关研究结果进行数据整合分析,综述了在降水量和温度变化下冻融作用对土壤中活性碳氮的影响。得出以下主要结果,(1)冻融作用提高了土壤中的可溶性有机碳、可溶性有机氮、铵态氮含量和微生物量碳氮比,降低了硝态氮和微生物量碳氮含量。(2)冻融作用对土壤中可溶性碳氮和微生物量碳氮比的影响效应随着降水量和温度的增加而增强,而对微生物量碳氮的影响效应随着降水量和温度的增加而减弱。结果表明,冻融作用影响了土壤可溶性碳氮含量和微生物量碳氮含量。降水量和温度的增加增强了冻融作用对高纬度和高海拔区土壤中可溶性碳氮的影响,却不利于微生物量碳氮的储存。土壤活性碳氮对维持生态系统稳定性具有重要作用,研究高纬度和高海拔地区冻融作用对土壤活性碳氮含量的影响,有助于进一步了解土壤活性碳氮对当前气候变化的反馈,为应对冻融对生态系统造成的影响提供参考。As important parts of soil carbon and nitrogen pool, activated carbon and nitrogen in the soil are important elements in the process of the ecosystem carbon and nitrogen cycle. Freeze-thaw has a profound impact on soil-activated carbon and nitrogen content in ecosystems at high latitudes and high altitudes. Climate change increases the risk of soil carbon and nitrogen loss under freeze-thaw,but there is still a lack of research on this aspect. To reveal the mechanism of the effect of freeze-thaw on the content of activated carbon and nitrogen in soil under the background of climate change, a data meta-analysis was carried out using the existing related research results. The effects of freezing and thawing on activated carbon and nitrogen in soil under changes of precipitation and temperature were reviewed. The main results were as follows.(1) Freezing and thawing increased dissolved organic carbon, dissolved organic nitrogen, ammonium nitrogen content, and microbial biomass carbon-nitrogen ratio, and decreased nitrate nitrogen and microbial biomass carbon and nitrogen content in soil.(2) The effect of freezing and thawing on dissolved carbon and nitrogen and microbial biomass carbon and nitrogen ratio in soil increased with the increase of precipitation and temperature, while the effect on microbial biomass carbon and nitrogen content decreased with the increase of precipitation and temperature. The results showed that freezing and thawing affected soil dissolved carbon and nitrogen content and microbial biomass carbon and nitrogen content. The increase in precipitation and temperature enhanced the effects of freeze-thaw on dissolved carbon and nitrogen in soils at high latitudes and high altitudes, but was not conducive to the storage of microbial biomass carbon and nitrogen. Soil-activated carbon and nitrogen play an important role in maintaining ecosystem stability. Studying the effect of freezing and thawing on soil-activated carbon and nitrogen content in high latitudes and high altitudes can explore the res

关 键 词：冻融作用 土壤可溶性碳氮 微生物量碳氮 降水 温度 

分 类 号：S153[农业科学—土壤学] S154[农业科学—农业基础科学] X144[环境科学与工程—环境科学]