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存在于土壤微生物细胞中的有机氮素总量总称为土壤微生物生物量。土壤中氮生物量的多少,在一年中是变化很大的。当土壤中微生物的数量增加时,微生物从土壤中吸收植物根本无法吸收利用的无机氮;在这个时间内,生物量起了植物氮素的贮藏库的作用。当土壤中微生物的数量减少时,某些生物氮像由残存者分解死的微生物一样,把分解产生的铵释放到土壤中,也就是说微生物细(?)发生矿质化。在这个时期内,生物量开始作为植物有效氮的来源。
The total amount of organic nitrogen present in soil microbial cells is collectively referred to as soil microbial biomass. The amount of nitrogen in soils in the soil varies greatly throughout the year. As the number of microorganisms in the soil increases, the microorganisms absorb inorganic nitrogen from the soil that the plants simply can not absorb and utilize; during this time, the biomass plays a role as a reservoir of plant nitrogen. When the amount of microorganisms in the soil decreases, some of the biological nitrogen releases the ammonium generated by the decomposition into the soil like the microorganisms that are dead by the survivors, that is, the mineral fine (?) Is mineralized. During this period, biomass began to act as a source of plant available nitrogen.