摘要
研究结果表明,有机、无机肥施用后,土壤微生物量C、N、P开始增加很快,随着时间的推移,土壤微生物量C又有所降低,但生物量N和P则基本保持稳定。硫铵施入土壤后,微生物对肥料(15)N的生物固持10天后达到最高峰,以后被固持在体内的(15)N有一部分被逐渐释放出来,但一个月后仍有17%左右的(15)N被固持在微生物体内。硫铵与有机肥配合施用时,微生物对硫铵(15)N固持比例有所增加。有机肥中的15N被微生物固持的比例也较大,在肥料施入20天左右达到最大值,一个月后仍有19—25%存在于微生物体内。硫铵施用一个月后(15)N损失高达18%,有机肥中的N也有少量被损失。
Experiments were carried out to study the changes of soil microbial biomass C, Nand P and the transformation of N after application of organic and inorganic fertilizersby using isotope of 15N. The results showed that the soil microbial biomass C, N andP increased greatly after application of organic manures at the beginning of theexperiment and thereafter the biomass C decreased, but the biomass N and Premained constant. The immobilization of 15N rose to the highest about 10 days afterapplication of 15N-labelled (NH4)2SO4 and one month latter about 17% of the 15N wasstill in the soil microbes; when combined with organic manures the immobilization of15N from (NH4)2SO4 increased. About 19-25% of 15N from the 15N-labelled organicmanures .was also immobilized in the microbes at the 30th day after application. Incase (NH)2SO4 was applied alone the loss of N was about 18%, however, whencombined with organic manure the loss decreased.
出处
《土壤学报》
CAS
CSCD
北大核心
1998年第2期227-234,共8页
Acta Pedologica Sinica
基金
国家自然科学基金!39430090
关键词
土壤微生物量
氮素转化
有机肥料
无机肥料
Soil microbial biomass, ^(15)N of isotope, Loss of N, Immobilization of N