天然割草地补充施用亏损营养元素的研究

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

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.