| 长期施肥对红壤稻田耕层土壤碳储量的影响 |
| 摘要点击 1767 全文点击 939 投稿时间：2008-06-13 修订日期：2008-08-13 |
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| 中文关键词 施肥模式 红壤稻田 耕层 土壤碳储量 土壤容重 |
| 英文关键词 fertilization systems reddish paddy plough layer soil carbon storage soil bulk density |
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| 中文摘要 |
| 以红壤性稻田土壤为对象，研究了长期施肥（1990～2006年）对稻田表层土壤碳储量及固碳潜力的影响，讨论了耕层厚度变化对碳储量估算及处理间差异的影响.研究发现，与长期施用化肥相比，有机物的循环利用能显著提高红壤性稻田土壤碳储量，其碳储量为57.7～66.2 t/hm2，比试验前高出18.7～27.2 t/hm2，而长期施用化肥碳储量提高幅度平均为5.4 t/hm2.红壤性稻田土壤饱和固碳量为84.0 t/hm2，与目前碳储量相比还有17.8～43.7 t/hm2的固碳潜力.研究证实，土壤碳储量与土壤容重和表层土壤厚度的变化密切相关，以20 cm或23 cm作为统计厚度估算表层土壤的碳储量将分别低估20.6％和11.3％，其中有机物施用处理碳储量低估幅度最大（分别为26.8％和18.9％）；另外，用相同统计厚度进行碳储量估算减小了不同施肥处理间的差异.从稻田土壤碳储量及固碳潜力来考虑，有机物配合化肥施用是红壤稻田较优的施肥方式. |
| 英文摘要 |
| With a reddish paddy soil as test materials，soil profile nitrogen storage in long-term different fertilization system(1990-2006) have been investigated．The result indicated that recycling of organic matter significantly increased the soil profile C storage(ranged from 57.7 to 66.2 t/hm2), and it was increased by 18.7-27.2 t/hm2 compared with the soil profile C storage of 1990. But it was increased by 5.4 t/hm2 with only application of chemical fertilizers．Saturated carbon storage of paddy soils was 84.0 t/hm2，and the C sequestration potential ranged from 17.8-43.7 t／hm2 compared with the current soil profile carbon storage．The result showed that there was a significant relationship between soil bulk density and depth changes of profile soil．The organic C storage would be greatly underestimated by 20.6％ or 11.3％ if we only take 20 cm or 23 cm as the standard depth in the estimating method for organic C storage，it also would be underestimated the difference of treatments．The combined application of chemical fertilizer and organic matter is optimal for agricultural field based on soil organic C storage and the carbon sequestration potential． |
