有机无机肥配施对黄壤烟田有机碳组分的影响

采用长期田间试验,研究有机无机肥不同比例配施对土壤有机碳各组分含量的影响。结果表明,长期有机无机肥配施相比于对照增加了土壤总碳量和活性有机碳库,但未达到显著影响水平。有机肥提供30%氮结合化肥提供70%氮处理,与仅施用化肥相比,显著提高了土壤中可溶性有机碳、微生物生物量碳、轻组有机碳和颗粒有机碳含量,提升比例分别是61.19%、96.03%、52.17%和33.55%。有机肥提供30%氮量处理与对照相比,显著增加了黄壤中可溶性有机碳、微生物生物量碳、轻组有机碳和颗粒有机碳含量,再增加有机肥投入量,这些活性有机碳没有显著增加。综上说明,本地黄壤烟田采取有机肥提供30%氮结合化肥提供70%氮施肥措施,长期施用可显著培育黄壤烟田基础地力,同时提高烟叶的产质量,这对于保证我国烟叶生产的可持续发展具有非常重要的意义。

Effects of Combination Application of Organic and Inorganic Fertilizers on Organic Carbon Fractions in Tobacco-planting Yellow Soil

A long-term field experiment was conducted to study the effects of different combination proportions of organic and inorganic fertilizers on the contents of soil organic carbon fractions in tobacco-planting yellow soil. The results showed that compared with CK, long-term combined application of organic and inorganic fertilizers increased soil total carbon and active organic carbon pool, but did not reach significant level. Compared with the treatment with chemical fertilizer only, the treatment with organic fertilizer providing 70% nitrogen and chemical fertilizer providing 30% nitrogen increased significantly the contents of dissolved organic carbon, microbial biomass carbon, light fraction organic carbon and particulate organic carbon by 61.19%, 96.03%, 52.17% and 33.55%, respectively. The treatment with organic fertilizer providing 30% nitrogen and chemical fertilizer providing 70% nitrogen increased significantly the content of dissolved organic carbon, microbial biomass carbon, light fraction organic carbon and particulate organic carbon, but no significant increase was found in these active organic carbon fraction with continuous increasing organic fertilizer input. Therefore, the treatment with organic fertilizer providing 70% nitrogen and chemical fertilizer providing 30% nitrogen is the optimal to improve the fertility of tobacco-planting yellow soil and to promote the yield and quality of tobacco, which is also important to guarantee the sustainable development of tobacco production.