天然割草地补充施用亏损营养元素的研究

The Research on the Replenishing Application of Lost Nutrient Elements in Natural Mowing Grassland

天然割草地补充施用亏损营养元素的研究结果表明：当补充施用制取部分的各种营养元素量时，不但可以与对照群落生物量持平，而且还增加了２．５７％．当补充施用割取部分加留茬部分各种营养元素量时，较对照增产４．３６％．在割取部分加留茬部分的基础上，增加１０％的补充施用量时，较对照增产１９．３３％．在割取部分的基础上，减少１０％的补充施用量时，养分达不到平衡，较对照减产４．３７％．另外，禾草生物量得到不同程度恢复．

The results of the research on tile replenishing application of lost nutrient elements in natural mowing grassland showed:When the quantity of various elements taken away in the mowed parts were replenished and applied,the community biomass not only could reach the level of no-mowed site but also increased 2. 57%;when the nutrient elements in the mowed parts and the stubble were replenished and applied,the biomass could increase 4. 36%;on this basis,if 10% beyond the replenishing quantity was applied,the biomass could increase 19. 33% to that of nomowed;on the basis of replenishing elements in the mowed parts, if 10% of the replenishing quantity was reduced,so that the nutrient couldn't reach balance, the biomass would reduce 4. 37 %. Otherwise,the biomass of grasses could recovered in different degree with nutrient replenshing.