福建省土壤定位监测点养分变化规律及平衡分析

通过对福建省4个国家级、12个省级耕地土壤长期定位监测点7 a(1998-2004)监测,福建省主要耕地土壤的养分动态变化趋势为:有机质、全氮含量略有上升,有效磷上升较明显,碱解氮均有下降,水田土壤速效钾下降,旱地速效钾微升,所有升降都未达显著程度。通过对监测点农户施肥情况调查及养分平衡分析,认为农田氮磷投入盈余、钾亏缺,并提出今后稳氮、控磷、增钾的施肥对策。

Nutrient evolution tendency at some location monitored fields in Fujian Province

The nutrient contents of the surface soils at 16 cropped fields, among which 12 were established by the province and 4 by the state, were monitored during 1998 - 2004 in order to reveal the nutrient evolution tendency of the cropped fields in Fujian Province. The content of total N and organic matter in these soils increased slightly, the content of available P increased evidently whereas that of the alkali-hydrolyzable N decreased. The content of available K in paddy rice fields decreased while that in uplands increased slightly. All the evolution had no significant differences. The results indicated that N and P fertilizers were generally applied in excessive amount in Fujian Province.