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首页> 中文期刊> 《干旱地区农业研究》 >我国三种种植制度下农田土壤有机碳、氮关系的演变特征

我国三种种植制度下农田土壤有机碳、氮关系的演变特征

         
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摘要

对34个国家级耕地质量监测点20余年连续监测数据进行了统计分析,旨在探讨常规施肥下我国旱作、水旱轮作和稻田系统土壤碳、氮关系的演变特征.结果表明,1985～2006年.我国常规施肥方式下旱地、水旱轮作和稻田系统表层土壤有机碳和全氮均显著增加,三种种植制度下土壤C/N演变存在一定差异.土壤C/N均值从1985～1990年的9.87上升至2001～2006年的10.32.20年期间,土壤C/N分布在9～11的区间范围内的频率为45%～48%;土壤C/N在7～9区间的分布频率从27.5%减少到14.5%,但在11～13区间的分布频率从15.6%增加到27%,且30%以上的旱地连续监测点土壤C/N呈显著增加趋势.进一步分析表明,土壤C/N与土壤速效磷、速效钾以及磷肥和有机肥的投入量呈显著正相关关系.而与土壤pH值呈显著的负相关关系.表明常规施肥方式中,磷肥和有机肥投入促进了土壤中有机碳和全氮的积累,且对旱地土壤有机碳积累的贡献大于对氮素积累的贡献,是土壤碳、氮关系演变的重要影响因子.%Based on data of 20-year continuous observation from 34 sites around the country , we analyzed the characteristics of changes in SOC , TN and the relationship between SOC and TN in dry cropland , wheat-rice system and paddy fields under conventional fertilization . The results showed that SOC and TN contents in topsoil increased significantly in dry cropland , wheat-rice system and paddy fields , while the changes in the soil C /N ratio varied among the three typi- cal agro-ecosystems during the last 20 years of conventional fertilizations . The average of soil C /N ratio in these three types of agro-ecosystems changed from 9 .87 in 1985~1990 to 10 .32 in 2001~2006 . The frequency of soil C M ratio at the range of 9~11 were about 45% to 48% during the last 20 years . However, the frequency of soil C /N ratio at the range of 7~9 decreased from 27 .5% tol4 .5% , whereas the frequency of soil C /N ratio at the range of 11~13 increased from 15 .6% to 27% from 1985 to 2006 . Moreover, soil C /N ratio at more than 30% of contentious long-term observation sites in dry cropland increased in the last 20 years . Further analysis indicated that there were significantly positive correlations between soil C /N ratio and the content of available P, available K, and the input amount of phosphorus fertilizer and organic nitrogen in manure , while there was a significantly negative correlation between soil C /N ratio and soil pH . Overall, conventional fertilization accompanied with phosphorus fertilizer and organic manure promoted the accumulations of SOC and TN , and the effect on SOC accumulation exceeded the effect on TN . All these results indicated that application of phosphorus fertilizer and organic manure was the most important factor that affected the relation- ship between soil organic carbon and nitrogen .

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  • 来源
    《干旱地区农业研究》 |2011年第4期|121-126|共6页
  • 作者

    申小冉; 吕家珑; 张文菊; 辛景树; 任意; 徐明岗;

  • 作者单位

    西北农林科技大学资源环境学院;

    陕西;

    杨凌;

    712100;

    农业部作物营养与施肥重点开放实验室;

    中国农业科学院农业资源与农业区划研究所;

    北京;

    100081;

    西北农林科技大学资源环境学院;

    陕西;

    杨凌;

    712100;

    农业部作物营养与施肥重点开放实验室;

    中国农业科学院农业资源与农业区划研究所;

    北京;

    100081;

    全国农业技术推广中心;

    北京;

    100125;

    全国农业技术推广中心;

    北京;

    100125;

    农业部作物营养与施肥重点开放实验室;

    中国农业科学院农业资源与农业区划研究所;

    北京;

    100081;

  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 无机成分;
  • 关键词

    农田; 种植制度; 有机碳; 全氮; 土壤C/N;

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