| 知識類型 | 期刊 |
| 標題 | Effects of Biochar on Dispersibility of Colloids in Agricultural Soils |
| 作者 | K. G. I. D. Kumari, Per Moldrup, Marcos Paradelo, Lars Elsgaard, Lis W. de Jonge |
| 名稱(期刊/節目) | Journal of Environmental Quality |
| 期刊期數/節目集數 | Volume 46, Issue 1, Pages 143-152 |
| 出版單位 | Wiley |
| 出版年月日 | 2017/1/1 |
| 原文摘要 | The mobility of water‐dispersible colloids (WDCs) in soil may be influenced by soil management practices such as organic soil amendments. Biochar has recently been promoted as a useful soil amendment, and extensive research has been devoted to investigating its effects on soil macroscopic properties and functions. However, there is limited understanding of the effects of biochar application on micro‐scale particle dynamics. We conducted a field study to investigate the effects of the application of birch (Betula spp.) wood biochar on colloid dispersibility with respect to application rate, history, and physicochemical soil properties. Undisturbed soil cores (100 cm3) were collected from the topsoil of two agricultural sites in Denmark with soils of sandy loam texture. The two sites received biochar at different application rates (0–100 Mg ha−1) and were sampled 7 to 19 mo later. The WDC content was determined using an end‐over‐end shaking method on 100‐cm3 intact soil cores, and the colloid solution was analyzed for electrical conductivity, pH, and zeta potential. The WDC content increased with biochar application rate because of biochar‐induced changes in soil chemistry and was strongly and positively correlated with the concentration of exchangeable monovalent cations in the soils. Biochar application increased pH and decreased electrical conductivity and zeta potential in the colloid suspension more in the short term (7 mo) than in the long term (19 mo). Thus, there is potential for biochar to induce short‐term changes in soil solution chemistry in agricultural soils, which may influence the mobility of soil colloids. |
| 原文摘要簡述 | 水分散性膠體(WDC)在土壤中的流動性可能會受到土壤管理實踐(例如有機土壤改良劑)的影響。近來已推廣生物炭作為一種有用的土壤改良劑，並且廣泛研究致力於探討其對土壤宏觀性質和功能的影響。然而，在生物炭應用於對微尺度粒子動力學的影響了解有限。我們進行了一項野外研究，以研究樺木(Betula spp.)木材生物炭在膠體分散性方面的施用率、歷史和土壤理化性質的影響。從丹麥兩個農業用砂質壤土的表層土壤中收集未受干擾的土壤核心(100 cm3)。這兩個採樣地點以不同的施用率(0-100 Mg ha-1)接收生物炭，並在7到19 個月後取樣。 水分散性膠體含量是透過翻轉搖動法在100 cm3完整的土壤核心上測定的，並分析了膠體溶液的導電率、pH和ζ電位。水分散性膠體含量隨生物炭施用率的增加而增加，這是由於生物炭引起的土壤化學變化所致，並且與土壤中可交換單價陽離子的濃度呈正相關。短期(7個月)比長期(19個月)施用生物炭可增加pH值，並降低膠體懸浮液的電導率和ζ電位。因此，生物炭有可能在農業土壤中引起土壤溶液化學的短期變化，這可能會影響土壤膠體的流動性。 |
| 關鍵字 | water‐dispersible colloids (WDCs), soil amendment, biochar, soil macroscopic propertie, colloid dispersibility, application rate |
| 連結 | https://doi.org/10.2134/jeq2016.08.0290 |