施用生物质炭对旱地红壤有机碳矿化及碳库的影响

发布时间：2018-06-03 12:15

本文选题：生物质炭 + 红壤　；参考：《水土保持学报》2017年02期

【摘要】：为探究生物质炭施入旱地红壤后对该地区土壤有机碳矿化以及有机碳库的影响,采用田间定位试验,设置7种生物质炭施用量处理,分别为0(C0),2.5(C1),5(C2),10(C3),20(C4),30(C5),40t/hm2(C6),以三库一级动力学理论为基础,对这7种处理的土样进行了室内呼吸培养试验。结果表明:(1)与C0相比,C4、C5和C6处理的土壤有机碳含量呈上升趋势,C5处理土壤有机碳含量上升幅度最大为14.66%;C2、C3、C4、C5和C6处理土壤活性碳均显著增加,C6处理增幅最大为25.00%;土壤惰性碳在C3、C4、C5和C6处理中显著增加,增幅分别为18.92%,40.09%,53.60%和49.55%;除C5处理外,其他生物质炭施用量下土壤缓性碳相对于C0处理,分别降低了1.96%,6.54%,8.82%,9.31%和12.91%。(2)与C0处理相比,施加生物质炭后土壤有机碳累积矿化量均显著降低,C6处理降低幅度达25.93%。随着生物质炭施用量的增加,土壤有机碳累积矿化量逐渐降低。(3)土壤有机碳、活性碳和惰性碳与生物质炭施用量存在极显著(p0.01)的正相关,土壤缓性碳与其存在显著(p0.05)的负相关。研究结果可为提升典型旱地红壤肥力,减缓温室气体排放提供科学依据。
[Abstract]:In order to investigate the effect of biomass carbon application on soil organic carbon mineralization and organic carbon pool in upland red soil, seven kinds of biomass carbon treatments were set up by field location experiment, which were 0 ~ (10) C _ (2) C _ (2) C _ (2) C _ (3) ~ (10) C _ (3) C _ (3) ~ (20) C _ (5) ~ (30) t ~ (40) t ~ (-1) ~ (2) C _ (6) C _ (6), based on the first-order kinetic theory of three reservoirs. The indoor respiratory culture experiments were carried out on the seven treated soil samples. The results showed that compared with C0, the soil organic carbon contents of C _ (4) C _ (5) and C _ (6) treatments showed an increasing trend. The soil organic carbon contents of C _ (5) treatment and C _ (5) treatments increased significantly by 14.66 C _ (2) C _ (3) C _ (4) C _ (5) and C _ (6) treatments respectively. Inert carbon increased significantly in C3C4C5 and C6 treatments. The increases were 18.922.40.09% and 49.55%, respectively. In addition to C5 treatment, soil slow carbon decreased by 1.96% 6.54% 8.82% and 12.91% respectively in comparison with C0 treatment. The accumulation and mineralization of soil organic carbon were significantly reduced by C6 treatment by 25.93% after applying biomass carbon. With the increase of biomass carbon application rate, the cumulative mineralization amount of soil organic carbon decreased gradually. (3) soil organic carbon, active carbon and inert carbon had a very significant positive correlation with biomass carbon application rate (p 0.01), and soil slow carbon had a significant negative correlation with soil organic carbon application rate (p 0.05). The results can provide scientific basis for improving fertility of typical upland red soil and reducing greenhouse gas emission.
【作者单位】：南京农业大学资源与环境科学学院;南京信息工程大学应用气象学院;
【基金】：耕地地力影响化肥养分利用的机制与调控(2016YFD0200305) 江苏省自然科学基金项目(SBK2015040286) 中国博士后基金项目(2016M591884)
【分类号】：S153.6

【参考文献】