Plant aboveground biomass data: Old-Field Chronosequence: Plant Productivity

The goal of this research is to study the change in plant growth and species distribution during succession. Annual plant growth above ground is annually sampled in more than 20 fields from 4 permanently marked 3m x 4m plots in each field. These fields were previously cultivated, but then abandoned from agriculture at various times in the past. The fields were left undisturbed for plants to develop from seeds within the soil or brought into the fields by wind or animals. The fields included in this study are 4, 5, 10, 24, 26, 28, 35, 39, 41, 45, 53, 70, 72, 77 and the Lawrence strip that was abandoned in 1988. This experiment was started in 1988 by lead investigators David Tilman and Johannes Knops.

本研究旨在探究群落演替过程中植物生长动态与物种分布格局的变化。研究人员通过每块样地内设置的4个永久标记的3米×4米样方，对超过20块样地的一年生植物地上生物量进行年度采样。这些样地此前均为农耕用地，后于不同历史时期弃耕。弃耕后样地未受人为干扰，植物可通过土壤种子库中的种子，或是经风力、动物携带进入样地的种子自然萌发、生长。本研究涉及的样地包括编号为4、5、10、24、26、28、35、39、41、45、53、70、72、77的样地，以及1988年弃耕的Lawrence样带。本实验由首席研究员David Tilman与Johannes Knops于1988年启动。