长期施肥对红壤稻田耕层土壤碳储量的影响

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.

Effect of Long-term Fertilization on Soil Plough Layer Carbon Storage in a Reddish Paddy Soil

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/hm~2),and it was increased by 18.7-27.2 t/hm~2 compared with the soil profile C storage of 1990.But it was increased by 5.4 t/hm~2 with only application of chemical fertilizers.Saturated carbon storage of paddy soils was 84.0 t/...