氮修饰木素对土壤生化特性的影响

The Influences of N-modified technical lignin on soil biochemical properties

文章通过氮修饰木素对土壤生化特性影响的研究,旨在探索工业木素资源的高效利用途径。研究结果表明,在培养土壤(总培养期4个月)中直接掺入1%的工业木素,土壤微生物量(C,N)、土壤净N矿化率除培养初期有一定的影响外,在其余时间内几乎没有显著变化,但土壤微生物代谢熵值(qCO2)在大多数培养时间内有明显增加,说明掺入工业木素对土壤微生物的生理状况产生一定的负面作用。与此相对,掺入氮修饰木素对土壤微生物的正常生长没有不利的影响。比较两类氮修饰木素产品(高压和常压工艺产品),常压工艺生产的氮修饰木素的总含氮较低,但该产品在前3个月的氮矿化率高于加高压工艺生产的氮修饰木素。两类氮修饰木素中结合的氮在整个培养过程中都表现出较好的缓释性。上述研究结果为氮修饰木素的生产和农业应用提供了重要的科学基础。

In order to approach a high efficient way of utilizing technical lignin, a study on influence of N-modified lignin on soil biochemical properties was conducted in this paper. The results showed that soil microbial biomass （C, N） and N mineralizarion rates in mixture of lignin and soil were mostly not significantly changed during the incubation （4 months incubation time） except in initial incubation phase. However, the soil metabolic quotient （qCO2） values increased significantly in most of the incubation time, indicating that the technical lignin brought somewhat negative impact on soil microorganism＇s physiological characteristic. By contrast, the incubated soils with addition of N-modified lignin showed no unfavorable condition to microbial activity. Comparing the two kinds of N-modified lignin （high pressure and normal pressure products）, the product with normal pressure procedure had lower total N concentration, but it showed a higher N mineralization rate in the first three-month incubation. Both kinds of N-modified lignin showed the character of slow releasing N. These results provided an important scientific background for production and application of N-modified lignin.