论文部分内容阅读
以柠条为原料开展生物炭生产和应用试验,探索柠条资源的新型利用途径。在缺氧和500℃的热解条件下,柠条生物炭的灰分元素含量高达14%,比表面积较大,为265m2/g,全N含量高达2.4%;FT-IR分析得到,柠条生物炭呈无定形的乱层结构,表面含有丰富的羧基、羰基官能团。把该生物炭以500kg/667m2的用量施于退化严重的半干旱地区土壤中,并同施用牛粪、牛粪+柠条生物炭和不施肥开展对比试验得到(按等量碳量施用),施用柠条生物炭1.5a后,退化林地土壤毛管持水量、田间持水量比对照分别提高10.7%和11.5%,土壤有机C、全氮、土壤的速效K含量显著提高,而土壤容重显著下降。施用纯牛粪,对上述测定性状的改良效果要明显好于按等量碳施用的牛粪,但施用牛粪对土壤的有效P的改善效果要显著好于施用单一柠条生物炭。而牛粪+柠条生物炭混合施用有利于土壤有机质、全N、速效K和有效P的保存。
Using Caragana korshinskii as raw material to carry out biochar production and application test to explore the new utilization of Caragana korshinskii resources. Under hypoxia and pyrolysis conditions of 500 ℃, the content of ash element in Caragana korshinskii was up to 14%, the specific surface area was 265m2 / g and the content of total N was up to 2.4%. FT-IR analysis showed that Caragana korshinskii Charcoal amorphous layered structure, the surface is rich in carboxyl, carbonyl functional groups. This biochar was applied to soils of severely degraded semi-arid areas at a rate of 500 kg / 667 m 2, and was compared with those using cow manure, cow manure + caragana biochar and no fertilization (applied at the same amount of carbon) After applying Caragana biochar 1.5a, the capillary water holding capacity of field soil in degraded forest increased by 10.7% and 11.5% respectively compared with the control. Soil organic C, total nitrogen and soil available K content increased significantly, while soil bulk density decreased significantly. The application of pure cow dung improved the above-mentioned traits significantly better than that of cow dung under the same amount of carbon application. However, the improvement effect of cow dung on soil P was significantly better than that of single kaffir birch biochar. However, the combination of cow manure and Caragana microphylla favored the preservation of soil organic matter, total N, available K and effective P.