长期施肥对中国3种典型农田土壤活性有机碳库变化的影响

被引:105
作者
张璐 [1 ]
张文菊 [1 ]
徐明岗 [1 ]
蔡泽江 [1 ]
彭畅 [2 ]
王伯仁 [1 ]
刘骅 [3 ]
机构
[1] 不详
[2] 中国农业科学院农业资源与农业区划研究所/农业部作物营养与施肥重点开放实验室
[3] 不详
[4] 吉林农业科学院资源环境中心
[5] 新疆农业科学院土壤肥料研究所
[6] 不详
关键词
长期施肥; 有机碳; 活性有机碳; 黑土; 灰漠土; 红壤;
D O I
暂无
中图分类号
S153.62 [];
学科分类号
摘要
【目的】观测分析了中国3种典型农田土壤——黑土、灰漠土和红壤有机碳在时间与空间上对长期不同施肥措施的响应特征,为农田土壤培肥提供理论依据。【方法】通过有机碳分组对比分析了长期施肥后土壤总有机碳与活性有机碳的含量与比例变化。【结果】16年后,不施肥(CK)灰漠土总有机碳、活性有机碳含量均呈显著下降趋势,下降幅度分别为11.7%和34.9%,且活性有机碳占总有机碳的比例也显著下降了5.4个百分点;长期施用氮肥(N)3种土壤总有机碳含量基本保持不变,但活性有机碳所占比例显著下降,其中黑土下降幅度高达9.5个百分点;化肥配施(NP,NPK)后,黑土和灰漠土活性有机碳占总有机碳的比例仍显著下降,红壤则略呈上升趋势;有机无机配施(NPKM、1.5NPKM),3种土壤的总有机碳、活性有机碳及活性有机碳占总有机碳的比例均显著提高,其中红壤上升幅度最大,NPKM处理提高幅度分别为80.6%、146.2%和7.5个百分点,其次是灰漠土,分别提高了64.4%、138.0%和5.0个百分点;实施秸秆还田(NPKS)后,红壤的总有机碳、活性有机碳及活性有机碳占总有机碳的比例分别增加了21.6%、59.0%和7.5个百分点,黑土和灰漠土则相对较稳定。【结论】活性有机碳占总有机碳比例对施肥措施反应敏感,长期不施肥或只施氮肥多数导致土壤总有机碳含量和活性有机碳所占比例下降,有机无机配施能维持和提高土壤有机碳含量和活性有机碳所占比例,且效果优于秸秆还田,优于化肥(NPK)配施。
引用
收藏
页码:1646 / 1655
页数:10
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