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模拟增温对冬小麦-大豆轮作农田土壤呼吸的影响
  • ISSN号:0250-3301
  • 期刊名称:环境科学
  • 时间:2012.12.15
  • 页码:4205-4211
  • 分类:X144[环境科学与工程—环境科学]
  • 作者机构:[1]南京信息工程大学江苏省大气环境监测与污染控制高技术研究重点实验室,南京210044, [2]南京信息工程大学环境科学与工程学院,南京210044
  • 相关基金:国家自然科学基金项目(41005088,41175136) 致谢:感谢南京信息工程大学的张寒、李兴阳在野外样品采集和分析中给予的帮助.
  • 相关项目:地表UV-B增强与O3升高对农田地-气碳氮交换的复合影响
中文摘要:

为研究模拟增温对冬小麦-大豆轮作农田土壤呼吸的影响,设置了随机试验,观测增温和对照处理的农田土壤呼吸速率.采用LI-8100开路式土壤碳通量测量系统对农田土壤呼吸速率进行观测,并采用气压过程分离技术(BaPS)测定土壤CO2产生速率.在观测土壤呼吸速率的同时,观测了两处理的土壤温度、湿度.结果表明,不同增温处理下土壤呼吸速率的季节变异趋势基本一致,其季节变异与土壤温度的变异具有一致性.冬小麦田增温和对照处理的平均土壤呼吸速率分别为(3.54±0.60)μmol·(m2·s)-1和(2.49±0.53)μmol·(m2·s)-1,大豆田增温和对照处理平均土壤呼吸速率分别为(4.80±0.46)μmol·(m2·s)-1和(4.14±0.29)μmol·(m2·s)-1.模拟增温显著促进了冬小麦田和大豆田的土壤呼吸作用,在冬小麦生长后期(抽穗-成熟期)增温和对照处理的土壤呼吸速率差异最为明显(P〈0.05);在大豆开花-结荚期以及鼓粒-成熟期增温与对照的土壤呼吸速率分别存在极显著性(P〈0.01)和显著性(P〈0.05)差异.进一步的研究表明,模拟增温和对照处理土壤呼吸均与土壤温度存在极显著(P〈0.01)的指数回归关系,但增温处理的土壤呼吸的温度敏感性明显高于对照,小麦生长季增温和对照处理的土壤呼吸温度系数Q10值分别为1.83和1.26,大豆生长季两处理的土壤呼吸温度系数Q10值分别为2.85和1.70.本研究表明,增温显著促进了农田土壤呼吸作用。

英文摘要:

This study was aimed to investigate the effects of simulated warming on soil respiration in a cropland under winter wheat-soybean rotation.Randomized experiments were carried out in the cropland.6 Plots were arranged and there were 2 treatments,simulated warming and control.A portable soil CO2 fluxes system(LI-8100) was used to measure soil respiration rates.Soil CO2 production rates were determined by using a Barometric Process Separation(BaPS) method.Soil temperature and soil moisture were simultaneously determined when measuring soil respiration rates.Results indicated that soil respiration rates in different treatments showed similar seasonal variability,in accordance with the variability in soil temperature.Seasonal mean soil respiration rates for simulated warming and control treatments were 3.54 and 2.49 μmol·(m2·s)-1,respectively,during the winter wheat growth season,while they were 4.80 and 4.14 μmol·(m2·s)-1,respectively,during the soybean growth season.Simulated warming significantly(P0.05) enhanced soil respiration during both the winter wheat and soybean growth seasons.The impact of simulated warming on soil respiration was particularly obvious during the later growth stages of winter wheat(from heading to maturity stages) and soybean(from flowing to maturity stages).Further investigations suggested that,for both the winter wheat and soybean growth seasons,the relationship between soil respiration and soil temperature could be well explained(P0.01) by exponential functions.The temperature sensitivity(Q10) of soil respiration in the simulated warming treatments was significantly higher than that in the control treatments.The Q10 values for the simulated warming and control treatments were 1.83 and 1.26,respectively,during the winter wheat growth season,while they were 2.85 and 1.70,respectively,during the soybean growth season.This study showed that simulated warming significantly increased soil respiration in the cropland.

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期刊信息
  • 《环境科学》
  • 中国科技核心期刊
  • 主管单位:中国科学院
  • 主办单位:中国科学院生态环境研究中心
  • 主编:赵进才
  • 地址:北京市2871信箱(海淀区双清路18号)
  • 邮编:100085
  • 邮箱:hjkx@rcees.ac.cn
  • 电话:010-62941102 62849343
  • 国际标准刊号:ISSN:0250-3301
  • 国内统一刊号:ISSN:11-1895/X
  • 邮发代号:2-821
  • 获奖情况:
  • 在全国第一届和第二届优秀科技期刊评比中分别荣获...,二次荣获中国科学院优秀期刊评比一等奖,荣获中国期刊方阵双奖期刊荣誉
  • 国内外数据库收录:
  • 俄罗斯文摘杂志,美国化学文摘(网络版),荷兰文摘与引文数据库,美国工程索引,美国生物医学检索系统,美国剑桥科学文摘,美国生物科学数据库,英国动物学记录,日本日本科学技术振兴机构数据库,中国中国科技核心期刊,中国北大核心期刊(2004版),中国北大核心期刊(2008版),中国北大核心期刊(2011版),中国北大核心期刊(2014版),中国北大核心期刊(2000版)
  • 被引量:69962