压实对矿区废弃土壤含水量及植物生长的影响

目的]探究不同压实处理对矿区废弃土壤含水量及植物生长的影响,为有效利用采石场废弃物和城市固体废弃物、改善矿区立地条件、进行植被修复提供依据。方法]将砾石和城市固体废弃物按体积8∶2混合后进行不同程度压实处理,进行小区试验。结果]压实显著提高基质含水量,减小各层含水量差异。随着压实程度增加,植物主要耗水层上移。不同植物受到压实的影响不同,刺槐和苜蓿在重度压实条件下生长明显受阻,侧柏生长量增加。植物在中等强度的压实条件下,能够通过调节自身,适应环境。结论]一定程度的压实能获得理想的植物保存率和生长量,压实技术可以运用在废弃采石场植被修复工作中。

Influences of Compaction on Soil Water Content and Plant Growth

Objective] Using municipal solid waste and coarse gravels which were produced during quarrying process and were left in the abandoned mines can produce a new growth substrate for plants. The effects of different compaction degrees on that kind of soil moisture content and the plants growing on it were researched to find ways to improve the disadvantageous site condition.Methods] Mixtures of gravels and municipal solid waste(8:2 by volume) were compacted to different extents and its effects on soil water content and plant growth were studied.Results] Soil water content was significantly enhanced by compaction and the differences among soil layers decreased. The layers that plants consumed water from upper under severer compaction. Plants responded differently to compaction. Aboveground growths of Robinia pseudoacacia and Medicago sativa were significantly declined in compacted soils, but the growth of Platycladus orientalis showed a sign of increase. The growths of all three species in two moderately compacted soils implied that plants can acclimate themselves to habitant.Conclusion] A certain degree of compaction is suitable for plant growth, and compaction can be applied during revegetation in abandoned quarries.