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大气CO2浓度升高和氮肥管理对稻麦轮作系统土壤线虫群落组成的影响
引用本文:鲍雪莲,李琪,梁文举,朱建国. 大气CO2浓度升高和氮肥管理对稻麦轮作系统土壤线虫群落组成的影响[J]. 中国农业科学, 2011, 44(22): 4627-4635. DOI: 10.3864/j.issn.0578-1752.2011.22.009
作者姓名:鲍雪莲  李琪  梁文举  朱建国
作者单位:1.中国科学院沈阳应用生态研究所森林与土壤生态国家重点实验室,沈阳 110164;2.中国科学院南京土壤研究所土壤与农业可持续发展国家重点实验室,南京 210008;3.中国科学院研究生院,北京 100039
基金项目:中国科学院知识创新工程方向项目(KZCX2-YW-QN403、KZCX3-SW-440); 国家自然科学基金资助项目(30770400)
摘    要: 【目的】揭示大气CO2浓度升高和氮肥管理对地下生态系统的影响。【方法】采用中国稻麦轮作FACE(Free-Air CO2 Enrichment)系统平台,开展了大气CO2浓度升高和氮肥管理对土壤线虫群落组成影响的研究。【结果】在稻麦轮作系统共观察到线虫35属,15个功能团。拟丽突属、真头叶属、丝尾属和潜根属为优势属,其中丝尾属和真头叶属对CO2浓度升高和氮肥管理反应敏感。在CO2浓度升高条件下土壤线虫总数、功能团Fu2和Om4的线虫多度均显著增加,其中Fu2多度在CO2和氮肥的交互影响下变化明显。【结论】CO2浓度升高和氮肥管理改变了土壤腐屑食物网的结构和有机质的分解途径。高氮条件下,CO2浓度升高降低了线虫的通路指数(CI),细菌为主的分解通道在小麦季的FACE(HN)处理中占优势。不同施氮水平对线虫结构指数(SI)产生显著影响,低氮条件下较高的SI值表明土壤环境受到的扰动较小,食物网处于结构化状态。

关 键 词:土壤线虫  FACE  氮肥  稻麦轮作
收稿时间:2010-07-26

Effect of Elevated Atmospheric CO_2 and N Fertilization on Soil Nematode Community in a Rice-Wheat Rotation System
BAO Xue-lian , LI Qi , LIANG Wen-ju , ZHU Jian-guo. Effect of Elevated Atmospheric CO_2 and N Fertilization on Soil Nematode Community in a Rice-Wheat Rotation System[J]. Scientia Agricultura Sinica, 2011, 44(22): 4627-4635. DOI: 10.3864/j.issn.0578-1752.2011.22.009
Authors:BAO Xue-lian    LI Qi    LIANG Wen-ju    ZHU Jian-guo
Affiliation:BAO Xue-lian1,3,LI Qi1,LIANG Wen-ju1,ZHU Jian-guo2(1State Key Laboratory of Forest and Soil Ecology,Institute of Applied Ecology,Chinese Academy of Science,Shenyang 110164,2State Key Laboratory of Soil and Sustainable Agriculture,Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,3Graduate University of Chinese Academy of Science,Beijing 100039)
Abstract:【Objective】 The effect of elevated CO2 and N fertilization on the below-ground ecosystem was studied. 【Method】 A study was conducted in the rice-wheat rotational FACE platform in China to quantify the effect of elevated CO2 and N fertilization on soil nematode community.【Result】Thirty-five genera and 15 functional guilds were observed in this system, and Acrobeloides, Eucephalobus, Filenchus and Hirschmanniella were dominant genera. Filenchus and Eucephalobus were sensitive to the treatment of elevated CO2 and N fertilization, respectively. Under the FACE condition, the abundance of total nematodes, functional guilds of Fu2 and Om4 increased significantly. The interactive treatment of elevated CO2 and N fertilization influenced the abundance of Fu2. 【Conclusion】Elevated CO2 and N fertilization resulted in the changes of soil nematode community structure and decomposition pathways. Under the high N conditions (HN), elevated CO2 decreased the channel index (CI), and bacteria dominated decomposition pathway was found in the FACE (HN) treatments in the wheat season. Different N fertilization managements influenced the values of structural index (SI), and the higher SI was observed under the low N condition (LN), which suggested a stable ecologically successional status with less disturbance.
Keywords:soil nematodes  FACE  N fertilization  rice-wheat rotation system  
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