Soil Nitrogen Cycling:Effect of Fire Frequency on Grassland Vegetation and Soils

The purpose of this experiment, begun in 1983 by Johannes Knops, is to determine what effect different fire frequencies have on grassland vegetation. This experiment is being conducted in field B. There are 4 different burn treatments:

1. plots burned every year
2. plots burned every other year
3. controls which are not burned
4. plots burned every fourth year

There are 6 replicates of each treatment which were randomly assigned to the 24 plots. Plots are 8 by 8 meters and are placed in a 3 by 8 grid with 2 meter walkways. Plots are marked with colored rebar at each corner.

这项由约翰内斯·克诺普斯（Johannes Knops）于1983年启动的实验，旨在探究不同火烧频率对草原植被的影响。本实验于B样地中开展，共设置4种火烧处理方案：
1. 每年火烧的样地
2. 每两年火烧的样地
3. 未施加火烧的对照组
4. 每四年火烧的样地
每种处理设置6个生物学重复，所有重复被随机分配至24个样地中。单块样地规格为8米×8米，以3行8列的网格排布，样地间预留2米宽的通行步道。所有样地均在四角使用彩色钢筋（rebar）进行标记。