Percent light penetration: Effect of N Addition on Vegetation with Mammalian Herbivory

The purpose of this experiment is to look at the effect of NH4NO3 addition in an unfenced area. The experiment is located in field E. There are 4 different treatments C, F, H, and I as defined in fertilization details in the "microplot" strategy. The plots are 4 by 4 meters and are laid out in an 8 by 8 grid with 1 meter aisles. From 1989-1994 plots with fertilizer treatment 1 were treated as complete controls, receiving no nutrients at all.本实验旨在探究硝酸铵（NH₄NO₃）施加对未围栏区域的影响效应。实验地块设于E号田块。本实验设置C、F、H、I四种处理方式，具体施肥细则详见微区试验（microplot）策略的相关说明。各试验小区尺寸为4米×4米，以8×8网格布局排布，小区间设置1米宽的通道。1989年至1994年间，施加1号施肥处理的试验小区被设为完全对照组，全程不施加任何营养物质。