2025-01-16 チャルマース工科大学
＜関連情報＞
- https://news.cision.com/chalmers/r/biochar-reduces-the-risks-of-ddt-contaminated-soil,c4092469
- https://www.sciencedirect.com/science/article/pii/S0048969724050186
土壌の健全性に対する緩やかな修復オプション（GRO）の効果を評価する方法： スウェーデンのDDX汚染樹木保育所における実証試験 A method for evaluating the effects of gentle remediation options (GRO) on soil health: Demonstration at a DDX-contaminated tree nursery in Sweden
Paul Drenning, Yevheniya Volchko, Anja Enell, Dan Berggren Kleja, Maria Larsson, Jenny Norrman
Science of The Total Environment Available online: 20 July 2024
DOI:https://doi.org/10.1016/j.scitotenv.2024.174869
Graphical abstract
Highlights
- A method to evaluate the effects of GRO on soil health is proposed.
- Effects on soil quality indicators linked to soil functions and ecosystem services
- The method is applied to evaluate GRO treatments in a field experiment in Sweden.
- GRO have positive effects on soil health to improve delivery of ecosystem services.
- The positive effects are attributable to biochar amendment and leguminous plants.
Abstract
Healthy soils provide valuable ecosystem services (ES), but soil contamination can inhibit essential soil functions (SF) and pose risks to human health and the environment. A key advantage of using gentle remediation options (GRO) is the potential for multifunctionality: to both manage risks and improve soil functionality. In this study, an accessible, scientific method for soil health assessment directed towards practitioners and decision-makers in contaminated land management was developed and demonstrated for a field experiment at a DDX-contaminated tree nursery site in Sweden to evaluate the relative effects of GRO on soil health (i.e., the ‘current capacity’ to provide ES). For the set of relevant soil quality indicators (SQI) selected using a simplified logical sieve, GRO treatment was observed to have highly significant effects on many SQI according to statistical analysis due to the strong influence of biochar amendment on the sandy soil and positive effects of nitrogen-fixing leguminous plants. The SQI were grouped within five SF and the relative effects on soil health were evaluated compared to a reference state (experimental control) by calculating quantitative treated-SF indices. Multiple GRO treatments are shown to have statistically significant positive effects on many SF, including pollutant attenuation and degradation, water cycling and storage, nutrient cycling and provisioning, and soil structure and maintenance. The SF were in turn linked to soil-based ES to calculate treated-ES indices and an overall soil health index (SHI), which can provide simplified yet valuable information to decision-makers regarding the effectiveness of GRO. The experimental GRO treatment of the legume mix with biochar amendment and grass mix with biochar amendment are shown to result in statistically significant improvements to soil health, with overall SHI values of 141 % and 128 %, respectively, compared to the reference state of the grass mix without biochar (set to 100 %).
