Integrated management systems and N fertilization: effect on soil organic matter in rice-rapeseed rotation

文献类型： 外文期刊

第一作者： Fan, Mingsheng

作者： Fan, Mingsheng;Li, Xiaolin;Tian, Jing;Fan, Mingsheng;Li, Xiaolin;Lu, Shihua;Tian, Jing;Kuzyakov, Yakov

作者机构：

关键词： Soil organic matter;Labile fractions;Integrated soil-crop system management (ISSM);N fertilization;Carbon management index (CMI)

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： Understanding the effects of long-term crop management on soil organic matter (SOM) is necessary to improve the soil quality and sustainability of agroecosystems. The present 7-year long-term field experiment was conducted to evaluate the effect of integrated management systems and N fertilization on SOM fractions and carbon management index (CMI). Two integrated soil-crop system management (ISSM-1 and ISSM-2, combined with improved cultivation pattern, water management and no-tillage) were compared with a traditional farming system at three nitrogen (N) fertilization rates (0, 150 and 225 kg N ha(-1)). Management systems had greater effects on SOM and its fractions than did N fertilization. Compared with traditional farming practice, the integrated management systems increased soil organic carbon (SOC) by 13 % and total nitrogen (TN) by 10 % (averaged over N levels) after 7 years. Integrated management systems were more effective in increasing labile SOM fractions and CMI as compared to traditional farming practice. SOC, TN and dissolved organic matter in nitrogen increased with N fertilization rates. Nonetheless, N addition decreased other labile fractions: particulate organic matter, dissolved organic matter in carbon, microbial biomass nitrogen and potassium permanganate-oxidizable carbon. We conclude that integrated management systems increased total SOM, labile fractions and CMI, effectively improved soil quality in rice-rapeseed rotations. Appropriate N fertilization (N150) resulted in higher SOC and TN. Though N application increased dissolved organic matter in nitrogen, it was prone to decrease most of the other labile SOM fractions, especially under higher N rate (N250), implying the decline of SOM quality.

分类号： S15

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