Plant Dominance Along an Experimental Nutrient Gradient
Plant Dominance Along an Experimental Nutrient Gradient
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DOI：
10.2307/1939125
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发表时间：
1984-10
期刊：
影响因子：
4.8
通讯作者：
David Tilman
中科院分区：
文献类型：
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作者：
David Tilman
8年生大田施肥试验结果表明，氮是氮、磷、钾、钙、镁的主要限制性养分，镁在施氮后成为限制性养分。施肥试验结束后，采用圆盘法进行扰动，并将其分为36个小区，采用拉丁方设计试验，研究氮镁施肥比例对植被格局的影响。到第二年，主要物种已沿着施加的N：Mg梯度分离，在低Mg但高N的一端，以糙剪股颖占优势，其次是冰草，Berteroa incana，月见草和Aristida basramea，这是在高Mg但低N梯度的一端占优势。一个未经处理的资源，在土壤表面的光的可用性，显着影响的治疗。结果表明，土壤养分相对有效性的空间异质性可能是演替早期植被空间异质性的原因之一。
Fertilization experiments in an 8—yr—old field demonstrated that N was the major limiting nutrient of N, P, K, Ca, and Mg, and suggested that Mg became limiting when N was added. After the fertilization experiments, this field was disturbed via thorough disking and divided into 36 plots for a Latin square design experiment on the effect of N:Mg fertilization ratios on vegetation patterns. By the second year, the major species had separated along the imposed N:Mg gradient, with Agrostis scabra dominant at the low Mg but high N end, followed by Agropyron repens, Berteroa incana, Oenothera biennis, and Aristida basiramea, which was dominant at the high Mg but low N end of the gradient. An unmanipulated resource, light availability at the soil surface, was significantly affected by the treatments. The results demonstrate that spatial heterogeneity in the relative availability of soil nutrient may be one cause of spatial heterogeneity in early successional vegetation.