科研之友
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摘要
Little is known about the effects of nitrogen (N), phosphorus (P) and potassium (K) application on soil chemical properties and plant species composition of mountain Festuca rubra grasslands. In this study, we aimed to determine whether fertiliser application affects plant species composition and soil properties during periods of management, and whether residual after-effects of fertiliser application can be detected eight years after its use is abandoned.
The experiment with unfertilised control, PK treatment and treatments with low and higher level of NPK application under three (intensive management from 1993 to 1997) and two cut management (moderate management from 1997 to 1999) was established in the Jizera Mts. (Czech Republic) on E rubra meadow and then the experiment was eight years abandoned.
Immediately after the introduction of intensive management, a decrease in species richness and diversification of plant species composition occurred. Plant communities which had diversified in different fertiliser treatments persisted under moderately intensive management. The cover of Alopecurus pratensis increased to >50% while the cover of Agrostis capillaris decreased to <5% in NPK treatments during the period of intensive management. Trifolium repens became the dominant species in the PK treatment. Within eight years, under no management, the differences in plant species composition disappeared, species richness decreased and E rubra, followed by Hypericum maculatum, became dominant in all treatments. The differences in biomass P concentration and plant available P and K concentrations in the soil were still detectable eight years after the last fertiliser application. As shown in this study, moderate application of NPK and consequent abandonment need not generate irreversible changes in species composition of mountain grassland.
- 出版日期2012-11
