高原泥炭地CO2通量对极端干旱 的响应机理研究
Response mechanism of CO2 flux to extreme drought in an alpine peatland
投稿时间:2020-01-14  修订日期:2020-03-26
DOI:
中文关键词:  极端干旱  泥炭地  CO2通量  土壤酶活性
英文关键词:Extreme drought  peatland  CO2 flux  soil enzyme activity
基金项目:国家重点基础研究发展计划(973计划);国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
吴海东 中国林业科学研究院湿地研究所 whd2752@126.com 
闫钟清 中国林业科学研究院湿地研究所  
张克柔 中国林业科学研究院湿地研究所  
王金枝 中国林业科学研究院湿地研究所  
康晓明 中国林业科学研究院湿地研究所 xmkang@ucas.ac.cn 
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中文摘要:
      近年来,频繁发生的极端干旱事件使得碳循环的关键过程发生重大改变,反过来又会反馈调节全球气候变化的趋势和强度,探明极端干旱事件对碳循环过程的影响机制就显得尤为重要。本研究以高原泥炭地为研究对象,采用野外控制试验和静态箱法,研究极端干旱事件对高原泥炭地生态系统二氧化碳(CO2)通量的影响及其与环境因子和土壤酶活性的相关性。研究结果表明:(1)极端干旱显著降低了若尔盖高原泥炭地生态系统的净生态系统CO2交换(Net ecosystem CO2 exchange,NEE)、生态系统呼吸(Ecosystem respiration,Re)和总初级生产力(Gross primary productivity,GPP)(P<0.05)。(2)对照处理下Re与空气温度和土壤温度呈现显著的正相关关系,极端干旱降低了Re对空气温度和土壤温度的敏感性。极端干旱处理和对照处理下,NEE与土壤温度的相关性随着土壤深度的增加而增大,Re变化趋势与NEE相反,且随着土壤深度增加,NEE、Re与土壤含水量的相关性逐渐降低。(3)NEE与β-葡萄糖苷酶(β-Glucosidase,BG)、α-葡萄糖苷酶(α-Glucosidase)显著相关(P<0.05),Re与木糖苷酶(β-Xylosidase)、纤维素外切酶(β-D-cellubiosidase)显著相关(P<0.05),GPP与BG显著相关(P<0.05)。
英文摘要:
      In recent years, frequent drought events will have far-reaching impact on the key processes of carbon cycle and can have further feedbacks on the trend and intensity of global climate change. It is very important to investigate the influential mechanism of the extreme drought events on the carbon cycle processes. In this study, the effects of extreme drought events on carbon dioxide (CO2) fluxes in peatland ecosystem and their correlation with environmental factors and soil enzyme activities were analyzed by field control experiments and static box method. The results showed that: (1) Extreme drought significantly reduced net ecosystem CO2 exchange (NEE), ecosystem respiration (Re) and gross primary productivity (GPP) of peatland ecosystem in the Zoige Plateau (P<0.05). (2) There was a significant positive correlation between Re and air temperature and soil temperature under the control treatment, extreme drought reduced the sensitivity of Re to air temperature and soil temperature. Both in the extreme drought treatment and control treatment, the correlation between NEE and Ts increased with the increasing of soil depth, the change trend of Re was opposite to NEE, and with the increase of soil depth, the correlation between NEE, Re and soil water content decreased gradually. (3) NEE was significantly correlated with β - glucosidase (BG) (P<0.05), α-glucosidase (P<0.05), Re was significantly correlated with β-xylosidase (P<0.05), β-D-cellobiosidase (P<0.05), GPP was significantly correlated with BG (P<0.05).
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