文章摘要
冯倩, 周娅, 张晓媛, 王丽梅, 王玉, 李世清, 李海增.大气CO2浓度升高对旱作玉米不同生育期土壤碳氮及组分的影响[J].水土保持学报,2019,33(3):221~227
大气CO2浓度升高对旱作玉米不同生育期土壤碳氮及组分的影响
Effects of Elevated CO2 on Soil Carbon and Nitrogen and Its Fractions at Different Growth Stages of Maize in a Semiarid Area
投稿时间:2018-02-26  
DOI:10.13870/j.cnki.stbcxb.2019.03.033
中文关键词: 大气CO2浓度升高  OTC气室  土壤碳氮组分  玉米
英文关键词: elevated CO2  open-top chamber  fractions of soil carbon and nitrogen  spring maize
基金项目:国家自然科学基金项目(31470523);国家重点研发计划项目(2017YFC0504504);陕西省自然科学基础研究计划项目(2017JM3020);国家重点实验室开放基金项目(A314021402-1614)
作者单位E-mail
冯倩1, 周娅1, 张晓媛1, 王丽梅1,2, 王玉1, 李世清1,2, 李海增3 1. 西北农林科技大学资源环境学院, 陕西 杨凌 712100

2. 西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室
, 陕西 杨凌 712100

3. 盛炎电子科技有限公司
, 河北 邯郸 056001 
sdwanglimei@163.com 
摘要点击次数: 196
全文下载次数: 88
中文摘要:
      为探明大气CO2浓度升高对旱作玉米不同生育期土壤碳氮及其组分的影响,以旱作春玉米为研究对象,基于田间定位试验,利用改进的开顶式气室(OTC)模拟大气CO2浓度升高的环境,设置当前自然大气CO2浓度(CK)、CO2浓度升高(700 μmol/mol,OTC+CO2)与OTC气室对照(OTC)3种处理,研究大气CO2浓度升高对玉米各生育期土壤有机碳、全氮、水溶性有机碳、水溶性氮、易氧化有机碳的影响。结果表明:与OTC相比,大气CO2浓度升高(OTC+CO2)对土壤有机碳及组分、土壤全氮均无显著影响,使水溶性氮在12叶期(V12)降低18.17%,灌浆期(R3)升高108.56%(P<0.05)。与CK相比,OTC+CO2处理显著降低了各生育期土壤有机碳(收获期R6除外)和全氮(V12除外)含量,降幅分别为4.47%~14.42%和6.78%~12.48%(P<0.05),降低了苗期(V6)水溶性有机碳、V12期水溶性氮、抽雄吐丝期(R1)与R6期易氧化有机碳含量,升高了R3期水溶性有机碳含量(P<0.05)。因此,试验设置条件下,大气CO2浓度升高对土壤有机碳及组分、土壤全氮均无显著影响,对水溶性氮的影响因生育期而异。在利用OTC系统模拟大气CO2浓度升高进行相关研究时,OTC对试验结果的影响不可忽视。
英文摘要:
      A field experiment was conducted to study the contents of organic carbon, total nitrogen, dissolved organic carbon, dissolved total nitrogen and readily oxidized organic carbon in spring maize field under three different environmental conditions:Natural atmospheric CO2 concentration (as the control, marked as CK), open-top chamber (OTC) system with CO2 concentration of 700 μmol/mol (marked as OTC+CO2) and OTC system with current atmospheric CO2 concentration (marked as OTC). The results showed that compared with OTC, the elevated CO2 had no significant effect on the contents of soil organic carbon, total nitrogen, dissolved organic carbon and readily oxidized organic carbon (P > 0.05), but decreased the dissolved total nitrogen by 18.17% (P<0.05) at V12 stage, and increased the dissolved total nitrogen by 108.56% (P<0.05) at R3 stage. Compared with CK, OTC+CO2 treatment decreased the soil organic carbon (expect R6) and total nitrogen (expect V12) during the whole period of maize, by 4.47%~14.42% and 6.78%~12.48% (P<0.05), respectively. The OTC+CO2 decreased the dissolved organic carbon at V6 stage, dissolved total nitrogen at V12 stage and readily oxidized organic carbon at R1 and R6 stages; but increased dissolved organic carbon at R3 stage (P<0.05). In conclusion, the elevated CO2 had no significant effect on organic carbon and its fractions, total nitrogen, but significantly affected dissolved total nitrogen. The impact of OTC on the results could not be ignored when using the OTC system to do the research about elevated CO2 concentrations.
查看全文   查看/发表评论  下载PDF阅读器
关闭