摘要
通过盆栽试验,研究了脲酶抑制剂氢醌(HQ)、硝化抑制剂双氰胺(DCD)及二者的组合(HQ+DCD)对种稻土壤N2O和CH4排放的影响.结果表明,在未施麦秸粉时,所有施抑制剂的处理均较单施尿素的能显著减少水稻生长期供试土壤N2O和CH4的排放.特别是HQ+DCD处理,其N2O和CH4排放总量分别约为对照的1/3和1/2.而在施麦秸粉后,该处理的N2O排放总量为对照的1/2,但CH4排放总量却较少差别.不论是N2O还是CH4的排放总量,施麦秸粉的都比未施的高出1倍和更多.因此,单从土壤源温室气体排放的角度看,将未腐熟的有机物料与尿素共施,并不是一种适宜的施肥制度.供试土壤的N2O排放通量,与水稻植株的NO-3N含量和土表水层中的矿质N量分别呈显著的指数正相关和线性正相关;CH4的排放通量则与水稻植株的生长量和土表水层中的矿质N量呈显著的线性负相关.在N2O与CH4的排放间,未施麦秸粉时存在着定量的相互消长关系;施麦秸粉后,虽同样存在所述关系,但难以定量化.
Through pot experiments, this paper studied the effect of urease inhibitor hydroquinone (HQ),
nitrification inhibitor dicyandiamide (DCD) and their combination (HQ+DCD) on the N 2O and CH
4 emissions from a lowland rice soil. The results show that with no wheat straw powder
amended, all treatments with inhibitors significantly reduced the N 2O and CH 4 emissions
during rice growth, as compared with the treatment only urea applied. Especially for treatment
HQ+DCD, its total amount of N 2O and of CH 4 emission was about 1/3 and 1/2 of the control,
respectively; while with wheat straw powder amended, the total N 2O emission of this treatment
was 1/2 of the control, but that of CH 4 emission had less difference. Wheat straw powder
amendment induced one times and more emissions of N 2O and CH 4 than no its application,
and hence, even only from the standpoint of diminishing soil source greenhouse gases
emission, applying unmatured composted organic materials with urea is an inappropriate
fertilization system. The N 2O flux from this soil had a significant positive exponential
relationship with the NO - 3 N content of rice plant and a significant positive linear
relationship with the mineral N content in soil surface waterlayer, while CH 4 flux had a
significant negative linear relationship both with the growth rate of rice plant and with the
mineral N content in soil surface waterlayer. There existed a quantitative trade off between N
2O and CH 4 emission in case of no wheat straw powder incorporated, while with its
amendment, the trade off still existed, but hard to quantify.
出处
《应用生态学报》
CAS
CSCD
1999年第2期189-192,共4页
Chinese Journal of Applied Ecology
基金
中-比国际合作研究项目
关键词
氢醌
双氰胺
氧化亚氮
甲烷
稻田生态系统
Hydroquinone,
Dicyandiamide, N 2O, CH 4, Lowland rice field ecosystem.