| Autor: |
Zhang, Yaling, Menke, Carl, Drigo, Barbara, Bai, Shahla, Anderson, Ian, Xu, Zhihong, Chen, Hong, Zhang, Manyun |
| Předmět: |
|
| Zdroj: |
Journal of Soils & Sediments: Protection, Risk Assessment, & Remediation; Oct2017, Vol. 17 Issue 10, p2410-2419, 10p |
| Abstrakt: |
Purpose: Re-establishment of soil nitrogen (N) capital is a priority in mine rehabilitation. We aimed to evaluate the effects of biochar addition on improving mine spoil N pools and the influence of elevated CO concentration on mine rehabilitation. Materials and methods: We assessed the effects of pinewood biochar, produced at three temperatures (650, 750 and 850 °C, referred as B, B and B, respectively), on mine spoil total N concentrations with five different plant species, including a tree species ( Eucalyptus crebra), N-fixing shrubs ( Acacia floribunda and Allocasuarina littoralis) and C and C grasses ( Austrodanthonia tenuior and Themeda australis) incubated at ambient (400 μL L) and elevated (700 μL L) atmospheric CO concentrations, as well as the effects of elevated CO on mine rehabilitation. Results and discussion: Soil total N significantly improved following biochar incorporation under all plant species ( P < 0.05) except for T. Australis. E. crebra had the highest soil total N (0.197%, 0.198% and 0.212% for B, B and B, respectively). Different from the negligible influence of elevated CO on soil properties under the grasses and the N-fixing shrubs, elevated CO significantly increased soil water and hot water extractable organic C (WEOC and HWEOC, respectively) and decreased total C under E. crebra, indicating that the nutrient demands were not met. Conclusions: Biochar addition showed the potential in mine rehabilitation in terms of improving soil N pool, especially with E. crebra. However, it would be more difficulty to rehabilitate mine spoils in future with the rising atmospheric CO concentration. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
|
Full text from SpringerLink