影响生物炭基氮肥氮素释放因素的研究
发布时间：2019-05-09 17:55
【摘要】：生物炭良好的孔隙结构使其具有较强的吸附能力和抗氧化能力,将生物炭作为缓控材料与硝铵结合,不仅可以延缓氮素的释放速率,还可以有效减少土壤养分的流失,加之本身含有大量的养分元素,施入土壤后自身也能为土壤提供部分养分供植物生长利用。本文以玉米秸秆生物炭(YJC)和沙蒿生物炭(SHC)为材料,通过混合造粒和吸附造粒的方式,研究炭基材料、制造工艺与条件、环境条件对氮素释放的影响,,并通过浸水实验、土柱淋溶实验和土壤养分释放实验对此进行评价。实验结果如下：(1)生物炭的性质受材料类型和炭化温度的影响。随炭化温度的升高,玉米秸秆生物炭和沙蒿生物炭的微观结构均遭到破坏,C、P、K和灰分含量增加,N、H含量降低,pH提高,比表面积增大,有效氮磷钾含量降低；在同一炭化温度下,两种生物炭的各元素的含量及孔隙结构等理化性质有明显差异,玉米秸秆生物炭微孔结构更衣被高温破坏,玉米秸秆生物炭的比表面积及总孔容和平均孔径均大于沙蒿生物炭,玉米秸秆生物炭的pH高于沙蒿生物炭,玉米秸秆生物炭C含量低于沙蒿生物炭。(2)通过浸水实验和土柱淋溶试验两次筛选,最终选出沙蒿炭(600℃)吸附肥clt3和50%玉米秸秆炭(600℃)混合肥为最优生物炭基肥。通过简单的浸水实验,选出壁纸胶为最适粘结剂,并且与生物炭的比例为1：10时,制备出的肥料颗粒性状最好。(3)土壤养分释放实验表明,土壤含水量越大,养分释放速度越快；环境温度对肥料养分释放速率的影响不太明确,有待进一步研究；土壤pH值为7时,肥料养分释放速度较快。
[Abstract]:The good pore structure of biochar makes it have strong adsorption capacity and antioxidant capacity. The combination of biochar as slow control material and ammonium nitrate can not only delay the release rate of nitrogen, but also effectively reduce the loss of soil nutrients. In addition, it contains a large number of nutrients, which can also provide some nutrients for plant growth and utilization. In this paper, corn straw biochar (YJC) and Artemisia annua biochar (SHC) were used as materials to study the effects of carbon based materials, manufacturing process and conditions, environmental conditions on nitrogen release by mixed granulation and adsorption granulation. The results were evaluated by soaking experiment, soil column leaching experiment and soil nutrient release experiment. The experimental results are as follows: (1) the properties of biochar are affected by material type and carbonation temperature. With the increase of carbonation temperature, the microstructure of corn straw biochar and Artemisia annua biochar was destroyed. C, P, K and ash content increased, N, H content decreased, pH increased, specific surface area increased, available nitrogen, phosphorus and potassium content decreased. At the same carbonization temperature, the content of elements and pore structure of the two kinds of biochar were obviously different, and the microporous structure of corn straw biochar was destroyed at high temperature. The specific surface area, total pore volume and average pore size of corn straw biochar were higher than those of Artemisia annua biochar, and the pH of corn straw biochar was higher than that of Artemisia annua biochar. The C content of corn straw biochar was lower than that of Artemisia annua biochar. (2) it was screened twice by water immersion test and soil column leaching test. Finally, Artemisia artemisia carbon (600 鈩，
本文编号：2472967
[Abstract]:The good pore structure of biochar makes it have strong adsorption capacity and antioxidant capacity. The combination of biochar as slow control material and ammonium nitrate can not only delay the release rate of nitrogen, but also effectively reduce the loss of soil nutrients. In addition, it contains a large number of nutrients, which can also provide some nutrients for plant growth and utilization. In this paper, corn straw biochar (YJC) and Artemisia annua biochar (SHC) were used as materials to study the effects of carbon based materials, manufacturing process and conditions, environmental conditions on nitrogen release by mixed granulation and adsorption granulation. The results were evaluated by soaking experiment, soil column leaching experiment and soil nutrient release experiment. The experimental results are as follows: (1) the properties of biochar are affected by material type and carbonation temperature. With the increase of carbonation temperature, the microstructure of corn straw biochar and Artemisia annua biochar was destroyed. C, P, K and ash content increased, N, H content decreased, pH increased, specific surface area increased, available nitrogen, phosphorus and potassium content decreased. At the same carbonization temperature, the content of elements and pore structure of the two kinds of biochar were obviously different, and the microporous structure of corn straw biochar was destroyed at high temperature. The specific surface area, total pore volume and average pore size of corn straw biochar were higher than those of Artemisia annua biochar, and the pH of corn straw biochar was higher than that of Artemisia annua biochar. The C content of corn straw biochar was lower than that of Artemisia annua biochar. (2) it was screened twice by water immersion test and soil column leaching test. Finally, Artemisia artemisia carbon (600 鈩，
本文编号：2472967
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