|
| Soil conditioning and inorganic carbon accumulation in acidified soil by silicate rock |
| Received:February 22, 2024 |
| View Full Text View/Add Comment Download reader |
| KeyWord:wollastonite;acidified soil;soil conditioning;inorganic carbon accumulation;crop growth |
| Author Name | Affiliation | E-mail | | JIANG Wenqi | State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China | | | XU Congbin | State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China | | | SUN Tianran | State Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China | trsun@rcees.ac.cn |
|
| Hits: 685 |
| Download times: 608 |
| Abstract: |
| The degradation of soil quality and loss of inorganic carbon caused by soil acidification in agricultural field attracts increasing attention recently. In this study, pot experiment was conducted with two types of acidic soil to evaluate the role of wollastonite, a typical silicate, in controlling acidification and aluminum toxicity, improving soil fertility, accumulating inorganic carbon, and enhancing crop growth. Results showed that wollastonite increased soil pH by 2.47-3.24 units, reduced the exchangeable aluminum in soil by 32.02%-54.52%, and promoted soil inorganic carbon accumulation to 0.40-1.26 mg·g-1 under the dosage of 50-200 g·kg-1. Initial soil pH imposed great impact on the weathering of wollastonite and the release of exchangeable calcium ions, which induced a 1.22-1.94 times higher accumulation of inorganic carbon in low pH（4.46）soil than that in high pH（5.40）soil. Further correlation analysis（R2=0.78, P=2.55× 10-7）revealed that the carbon source for soil inorganic carbon formation mainly derived from the microbial respiration of soil organic carbon. Addition of wollastonite also enhanced plant growth by a maximum of 16.89% - 32.08% of rice biomass（dry weight）. This was mainly due to the ability of wollastonite in inhibiting acidification and the toxicity of aluminum, as well as the enrichment of nutrient element silicon. Wollastonite increased the available silicon content in soil by 6.57-13.49 times. |
|
|
|
