Percent light penetration: Effects of Nitrogen on Vegetation Under Herbivore Pressure

The purpose of this experiment is to measure the effect of NH4NO3 addition on vegetation under herbivore pressure. This experiment is located in fields A, B, and C. There are 3 treatments, 2 nitrogen levels and a control. The treatments are E, G, and I as defined in fertilization details under the "microplot" category. There are 16 reps of the 3 treatments for a total of 48 plots in each field. Treatments are randomly assigned to the plots. The plots are 4 by 4 meters and are laid out in a 6 by 8 grid with 1 meter aisles. For a list of treatments, /see the treatment layouts in files trmte11. In 1987, experiment E053 was established on top of E011 in field C. For a list of treatments, see E053. Also is 1992, experiment (Walt Carson's) was established on top of E011 in field C. In the spring of 1992, experiment E100 was established on top of E011, in fields A, and B. For a list of treatments, see the treatment layouts in file trmte100.本实验旨在测定施加硝酸铵（NH4NO3）对植食动物压力下植被的影响。实验设置于A、B、C三块试验田内。实验共设3种处理组，包含2个氮素水平组与1个对照组，3种处理分别为E、G、I，具体定义详见“微小区（microplot）”分类下的施肥详情。每种处理设置16次重复，单块试验田总计48个样地，处理组随机分配至各对应样地。单块样地规格为4米×4米，以6行×8列的网格布局布设，样地间预留1米宽的通道。处理组列表详见trmte11文件中的处理布局方案。1987年，实验E053在C地块原有实验E011的基础上设立，其处理列表详见E053文档。1992年，沃尔特·卡森（Walt Carson）主持的实验同样在C地块的E011实验基础上开展。同年春季，实验E100在A、B地块原有实验E011的基础上设立，其处理列表详见trmte100文件。