Growth of five species of trees on experimental plots on sand tailings left after mining for rutile in Sierra Leone

Data comprise measured heights of five species of trees after 2.5 years growth between June 2007 and November 2009 in plots reclaimed using a variety of planting techniques and surface applications following mining for rutile in Lanti South, Sierra Leone, West Africa. Eight 25 by 25 metres plots were divided into four squares and four rectangles and planted in June 2007. The five tree species included Gmelina (Gmelina arborea), mango (Mangifera indica), cashew (Anacardium occidentale), citrus (Citrus sinensis) and monkey apple (Anisophyllea laurina). Five rows of trees were planted at a spacing of 5 meters in each direction to minimize above and below ground competition. Four planting treatments were tested: 1 bucket of compost per planting hole, 1 bucket of topsoil, 1 bucket of a 50:50 mix of compost and topsoil and a control. Surface treatments included 2 cm of compost, 5 cm of mulch, 2 cm of top-soil and a control.

本数据集记录了西非塞拉利昂兰蒂南部金红石（rutile）采矿废弃地，采用多种种植技术与地表施用措施开展生态修复的8块样地中，5个树种在2007年6月至2009年11月间经过2.5年生长后的实测树高数据。共设置8块25m×25m的修复样地，其中4块为正方形样方、4块为长方形样方，于2007年6月完成种植。本次试验涉及的5个树种分别为吉木尔木（Gmelina arborea）、芒果（Mangifera indica）、腰果（Anacardium occidentale）、柑橘（Citrus sinensis）与猴苹果（Anisophyllea laurina）。每个样地内按双向株行距5m配置5行林木，以最大限度降低林木地上与地下部分的种间竞争。本次试验共设置4种种植基质处理：每种植穴施用1桶堆肥、每种植穴施用1桶表土、每种植穴施用1桶堆肥与表土按1:1体积比混合的基质，以及空白对照组。地表施用处理则包括：施加2cm厚堆肥、施加5cm厚覆盖物、施加2cm厚表土，以及空白对照组。