Tropical tree species effects on soil pH and biotic factors and the consequences for macroaggregate dynamics

Data are from a randomized complete block experiment at La Selva Biological Station, Costa Rica. Data obtained by a wet-slaking method include the fraction of total soil contained within each of five size categories of macroaggregates (0.25-0.5, 0.5-1.0, 1-2, and 2-4 mm diameter) in the 0-15 cm depth interval under four mono-dominant 25-yr-old tree plantations, an unplanted Control, and the adjacent mature forest. Data also include the following variables regarding the macroaggregates in this experiment: carbon, nitrogen, organic and inorganic phosphorus concentrations and mass per g soil and C:N. Soil pH (0-15 cm) was measured for bulk soil. The planted (dominant) tree species in the plantations were: Hieronyma alchorneoides; Pentaclethra macroloba; Virola koschnyi; and Vochysia guatemalensis.

本数据集来源于哥斯达黎加拉斯塞尔瓦生物站（La Selva Biological Station）的随机完全区组试验。通过湿筛法（wet-slaking method）获取的实验数据，涵盖0-15 cm土层中，4个25年生单优乔木人工林、1个未种植对照样地以及邻近成熟林内，5个粒径级别（直径分别为0.25-0.5 mm、0.5-1.0 mm、1-2 mm及2-4 mm）的大团聚体（macroaggregates）占全土的比例。本数据集还包含本次实验中大团聚体的如下测定指标：每克土壤的有机碳、全氮、有机磷、无机磷浓度与质量，以及碳氮比（C:N）。另对0-15 cm的原状土壤测定了pH值。各单优人工林的优势种植树种为：Hieronyma alchorneoides、Pentaclethra macroloba、Virola koschnyi 及 Vochysia guatemalensis。