Seedling density: The Effect of Seed Addition on Biodiversity in an Oak Savanna

This experiment was established in an unfenced area of field D in the spring of 1991. There are 10 replicates of each of 5 treatments, making a total of 50 plots. Each plot is 1.5m x 1.5m with 1.0m aisles between the plots. The 50 plots were randomly assigned their treatments. Seeds were added to the plots in June of 1991 according to the following treatments: A. Complete Control B. Raked Control C. Forb Seed Added D. Grass Seed Added E. Forb and Grass Seed Added The number of grass and forb seedlings, in the center square meter, were counted in late July and late August of 1991. Percent cover estimates were done, also in the center square meter, of the established plants alone in late July and then, of the established plants and the seedlings together, in late August. Percent cover estimates will continue to be done on an annual basis. For a list of treatments, see the treatment layouts in file trmte91.本实验于1991年春季在D地块的未围栏区域内设立。共设置5种处理方式，每种处理设置10次生物学重复，总计50个样地。每个样地规格为1.5m×1.5m，样地之间设有1.0m宽的步道。50个样地的处理分配采用随机化方式。1991年6月，按照下述处理方案向各对应样地播种： A. 完全对照组（Complete Control） B. 耙地对照组（Raked Control） C. 杂类草播种组（Forb Seed Added） D. 禾草播种组（Grass Seed Added） E. 杂类草+禾草混合播种组（Forb and Grass Seed Added） 1991年7月末与8月末，对每个样地中心1平方米区域内的禾草与杂类草幼苗数量进行计数。同年7月末，同样在该中心1平方米区域内，仅对定居植株开展盖度百分率估算；同年8月末，则在该区域内对定居植株与幼苗的总覆盖情况开展盖度百分率估算。后续将每年持续进行盖度百分率估算工作。如需查阅处理方案列表，请参阅文件trmte91中的处理布局表。