设计修订以提高矿山尾矿复植的工厂性能
Mark G Johnson1, David M Olszyk1, Tamotsu Shiroyama2
1U.S. Environmental Protection Agency, Pacific Ecological Systems Division, Center for Public Health and Environmental Assessment, Corvallis, Oregon, USA.
Agrosystems, geosciences & environment
|January 25, 2024
概括
用石灰和生物炭修改低pH矿山尾矿显著改善了道格拉斯苗的生存和生长. 这些修正案对于成功地恢复受污染的矿场的植被至关重要.
科学领域:
- 环境科学 环境科学
- 土壤科学 土壤科学
- 林业林业 林业 林业 林业
背景情况:
- 福尔摩萨矿山的尾矿呈现出低pH,金属污染的环境,对工厂的建立具有挑战性.
- 以前的复植尝试因恶劣的条件和修正案的潜在植物毒性而受到阻碍.
- 道格拉斯 (Pseudotsuga menziesii) 是在这些地区重新造林工作的关键物种.
研究的目的:
- 评估各种补救性修正案的有效性,以在低pH矿山尾矿上建立道格拉斯杉.
- 确定最佳的修改策略,以改善污染土壤中的苗木生存和生长.
主要方法:
- 通过使用Formosa矿山尾矿进行了两次温室实验.
- 测试的修改包括石灰,生物固体 (BS),针叶植物生物炭 (BC) 和微生物注射剂 (LSM).
- 在不同的修改组合和应用率下,对幼苗的生存和生长进行了监测.
主要成果:
- 石灰应用增加了尾巴的pH值,使初始幼苗的生存成为可能.
- 高的生物固体含量是植物毒性,而与石灰一起添加生物炭进一步增加了pH值,降低了电导率,并改善了道格拉斯杉的生存率.
- 在实验中,石灰和生物炭对道格拉斯的生存有着持续的好处.
结论:
- 建议修改低pH,金属污染的矿山尾矿用石灰,一种营养来源,和生物炭,以获得成功的再生植被.
- 这些修正案为道格拉斯树的建立和增长创造了更有利的环境.
- 这些发现为恢复退化矿场提供了关键的建议.
相关概念视频
01:19Design Example: Maintaining Level of an Embankment
65
Constructing a roadway embankment over uneven terrain requires precise leveling to ensure stability and proper drainage. Surveyors use a leveling instrument and staff to calculate ground elevations and determine the required fill material at each point along the embankment alignment.The process begins by positioning a leveling instrument near a benchmark with a known elevation. A backsight reading establishes the instrument height, which serves as a reference for subsequent measurements. A...
65
00:46Bioremediation
18.4K
Bioremediation is the use of prokaryotes, fungi, or plants to remove pollutants from the environment. This process has been used to remove harmful toxins in groundwater as a byproduct of agricultural run-off and also to clean up oil spills.
18.4K
01:14Design Example: Managing Concrete Workability
81
This example deals with managing the workability of concrete for a raft foundation project under hot weather conditions. Workability is crucial for ensuring the concrete is easy to place, compact, and finish. In this scenario, a slump test — a common method to measure the workability of fresh concrete — initially indicated low workability. This was attributed to the rapid water loss from the concrete mix, exacerbated by the high temperatures causing the course aggregates to heat up.
81