摘要
通过8年定位试验,研究了长期不同施肥制度下土壤有机质质量动态变化规律。结果表明,采用有机肥(物)料配施常量NPK化肥,土壤有机碳、易氧化有机碳、腐殖酸碳及其占总有机碳比率、HAC、FAC和HAC/FAC不断提高,Kos持续下降,其变化速率表现为递减;长期不施肥和单施常量NPK化肥则造成Kos持续上升,其余指标以递减速率下降。不同施肥制度下土壤有机质质量指标的动态变化可利用渐近函数模拟。在试验的不同阶段,土壤腐殖酸碳总量的亏损或盈余向HAC分配比例的变化态势各异,长期不施肥处理随时间的延长渐减,单施常量NPK化肥处理基本上分配至HAC;有机肥(物)料配施化肥则呈现出后期>前期>中期的趋势。
In this paper, the effect of 8 - year - experiment of different fertilization treatments on the dynamic of soil organic matter quality was conducted. The results showed that organic manure combined with constant chermical NPK fertilizer continually increased the content of soil organic carbon, readily oxidable organic carbon, humus cat.n, and their proportion in total organic carbon, HAC, FAC and HAC/FAC, but decreased Kos progressively. However, without fertilizer or NPK fertilizer application alone increased Kos and lowered the content of the other indices. Dynamic change of soil organic matter quality with different fertilization treatments showed an asymptotic curve. In the different experimental periods, the proportion of HAC in the loss or profit of soil humus carbon was different.
出处
《土壤通报》
CAS
CSCD
北大核心
2007年第2期251-255,共5页
Chinese Journal of Soil Science
基金
河北省科委攻关计划(96220916D-4)
关键词
长期定位试验
施肥制度
有机质质量
动态变化
Long- term experiment
Fertilization treatments
Quality of organic matter
Dynamic
