|
| Effects of corn biochar and modified carbon on leaching of inorganic nitrogen and phosphorus in soil |
| Received:January 05, 2018 |
| View Full Text View/Add Comment Download reader |
| KeyWord:modified biochar;adsorption;nitrogen phosphorus loss;physical isolation |
| Author Name | Affiliation | E-mail | | WANG Jing | College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | FU Wei-zhang | College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | sdaufwz@sdau.edu.cn | | GE Xiao-hong | College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | ZHENG Shu-lian | College of Resources and Environment, Shandong Agricultural University, Tai'an 271018, China | | | BO Lu-ji | Key Laboratory of Agro-Environment in Huanghuaihai Plain, Ministry of Agriculture and Rural Areas, Shandong Agricultural Resource and Environmental Science Research Institute, Jinan 250000, China | |
|
| Hits: 2490 |
| Download times: 1703 |
| Abstract: |
| In this study, biochar and modified biochar were used to investigate the adsorption kinetics of nitrate and phosphorus. A 3 cmthick physical barrier of biochar and modified carbon was applied to a depth of 50 cm. The soil column leaching experiment was used to study the effect of biochar on the leaching of inorganic nitrogen and phosphorus in the soil. The results showed that when the carbonization temperature was 500℃ and the iron carbon ratio was 0.7, the adsorption capacity of the biochar and modified carbon to nitrogen and phosphorus was the strongest. In addition, the kinetics of adsorption isotherm biochars before and after modification were more in line with the Langmuir adsorption equation and dynamics equation of quasi secondary. Biochar modification before adsorption by nitrate into a modified maximum of 2.414 mg·g-1, biochar and modified carbon on phosphorus adsorption quantity biggest were 1.723 mg·g-1 and 16.062 mg·g-1. Compared with the control, biochar and modified carbon leaching loss of nitrate nitrogen were decreased by 11.2% and 31.6%, the leaching amounts of phosphorus were significantly decreased by 33.1% and 82.9%, respectively, significantly reduced the amount of ammonia nitrogen leaching 44.3% and 68.6%. Analysis of soil residual nutrients after leaching test showed that the addition of isolation layer did not significantly affect the contents of NO3--N, NH4+-N and PO43--P in 0~40 cm soil layer, while the modified carbon could effectively reduce NH4+-N and PO43--P migrated to deeper soil layers, indicating that the leaching risk in soil by adding modified biochar can effectively reduce the inorganic nitrogen and phosphorus in soil. |
|
|
|
