Soil bacterial community responses to cadmium and lead stabilization during ecological restoration of an abandoned mine     

Shuwen Zhao  Luyao Qin  Lifu Wang  Xiaoyi Sun  Lei Yu  Meng Wang  Shibao Chen 《Soil Use and Management》2022,38(3):1459-1469

Ecological restoration refers to the gradual recovery of damaged ecosystems by utilizing their self-recovery capacity and artificial measures. It is considered as an effective technique to alleviate heavy metal pollution in open-pit mining soils. However, little is known about the stability of heavy metals and soil bacterial responses in artificially restored soil-plant systems. In this study, different vegetation restoration strategies were established in the Dabaoshan mining area, China, and the accumulation and transfer of Cd/Pb in the soil-plant system and the responses of the soil bacterial community were investigated. Results showed that ecological restoration with a combination of trees, shrubs and grasses/herbs could increase soil cation-exchange capacity and organic matter content, but not soil pH. The mixture of trees, shrubs and grasses/herbs was most effective for reducing the available Pb content to 33.7% of the content in the control, and the mixture of trees and grasses/herbs was beneficial in reducing Cd to 60.4% of the content in the control. Data showed that ecological restoration could change the quantity, composition and community structure of soil microorganisms. The soils in which a mixture of trees, shrubs and grasses/herbs were grown had the greatest abundance and diversity of bacteria; the abundances of Proteobacteria increased by 12% and Actinobacteria by 5% from those of the control. Plant coverage, soil available Cd content, and organic matter emerged as major determinants of bacterial community composition. This study demonstrates a promising remediation strategy for limiting Cd/Pb mobility in mining areas.  相似文献   

Compost addition,but not tillage,affects establishment of urban highway plantings     

《Urban Forestry & Urban Greening》2022

Establishment of roadside plantings is often limited by adverse site conditions, particularly poor soil physical and chemical properties. We compared plant establishment of shrubs, herbaceous perennials, and grasses in response to addition of compost and/or tillage before planting in replicated plots at two locations along an interstate highway near Detroit, MI, USA. Plots at each location received one of four site preparation treatments: control (no treatment), compost only (top-dressed with 8 cm of municipal compost), tillage only (soil tilled to 20 cm) or compost + tillage (8 cm of compost added and tilled to 20 cm). Within each site preparation plot, we established sub-plots of 16 selections of shrubs, perennials, and ornamental grasses. Compost addition, plant selection, and location affected (P ≤ 0.05) plant survival, height growth, and % plant cover two years after planting. Tillage did not affect (P > 0.05) plant establishment. Similarly, the interaction of tillage × compost was not significant, indicating that surface application of compost was as effective as tilling compost into the soil. Improved plant establishment with the addition of compost was associated with improved soil and plant nutrition and reduced soil pH and soil bulk density. Within each plant group (i.e., shrubs, perennials, grasses) plant establishment varied widely. Overall, the results indicate that compost addition can improve establishment of diverse roadside plantings, which was associated with improved soil fertility. In contrast, tillage provided comparatively little benefit to plant performance in this trial.  相似文献   

观赏草的观赏特性与养护技术研究进展   总被引：5，自引：2，他引：3  

赵天荣  蔡建岗  施永泰  倪建刚 《草原与草坪》2009,(4):77-80

观赏革种类繁多，是一个相当大的族群。其特点是：分孽性强，单株多丛生，群体成片分布；茎秆姿态优美，叶片色泽丰富，花序多姿多彩，具有较高的观赏价值。观赏草大多对环境要求粗放，管护成本低，抗性强，繁殖力强，适应面广，符合当前建设节约型园林的要求。其独特的景观效果，不仅是公路、河流、山坡等处绿化美化的优良材料，而且可以广泛应用于各种园林景观的营造中。本文就观赏草的观赏特性，栽培养护及其应用等几个方面进行了综述。  相似文献