| 廖雄辉,龙琴,王惠群,易自力,薛帅.南荻炭与镉钝化剂互作对水稻镉含量和产量的影响[J].农业环境科学学报,2018,37(9):1818-1826. |
| 南荻炭与镉钝化剂互作对水稻镉含量和产量的影响 |
| Interaction effects of Miscanthus lutarioriparius-derived biochar and cadmium passivators on rice cadmium content and yield |
| 投稿时间：2018-04-11 |
| DOI：10.11654/jaes.2018-0477 |
| 中文关键词: 南荻生物炭 土壤调理剂 镉钝化剂 降镉潜力 |
| 英文关键词: Miscanthus lutarioriparius biochar soil conditioner cadmium passivator cadmium reduction potential |
| 基金项目:湖南省"青年百人计划"项目（5404921）；湖南农业大学青年自然科学基金项目（16QN21）；国家级大学生创新创业训练计划项目[（G）SCX1603] |
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| 中文摘要: |
| 为探索一种具有降镉效应的南荻炭基土壤调理剂以缓解湖南省稻田镉污染现状，并为洞庭湖区南荻资源的利用提供新途径。试验以深两优5814为材料，将南荻炭与五种镉钝化剂按L25（56）正交表进行复配，通过模拟镉污染土壤盆栽试验，研究各复配因素施用对水稻镉含量的影响，进而确定南荻炭基降镉土壤调理剂的最佳配伍。结果表明：南荻炭与五种镉钝化剂互作可显著降低（P<0.05）水稻茎叶和稻谷籽粒的镉含量，尤其以南荻炭：腐植酸：硅酸钾：钙镁磷：硫酸锌：熟石灰=200：60：3：30：4：120互作比例下效果最显著，且相应最佳施用量为6.25 t·hm-2。三组最接近理论配比的土调剂施用后，水稻植株的平均镉含量可降至0.88~1.65mg·kg-1，与空白处理相比，降镉率达54.4%~75.7%；籽粒的平均镉含量可降至0.13~0.17 mg·kg-1，降镉率为45.2%~58.1%。三组土调剂施用还可显著增加稻谷产量，其中最高增产率达34.8%（相当于1.89 t·hm-2）。南荻炭与镉钝化剂互作可优化南荻炭的降镉潜力，复配施用后能显著降低水稻镉含量，并能显著提高稻谷产量，具有广阔的市场开发利用潜力。 |
| 英文摘要: |
| This study was designed to explore the interaction effects of Miscanthus lutarioriparius-derived biochar with five cadmium (Cd) passivators on rice Cd content and yield. Based on the results, it was expected to determine their optimum application rates and develop a M. lutarioriparius biochar-based soil conditioner. The L25 (56) orthogonal test was firstly used to determine the experimental treatments and then 25 treatments with three replications were conducted in a pot trial. Results showed that the interaction of the six tested factors could both reduce the Cd content of rice plants and grains, and improve the rice yield significantly (P<0.05). The optimum interaction ratio of M. lutarioriparius-derived biochar:humid acid:potassium silicate:calcium magnesium phosphate:zinc sulfate:slaked lime was 200:60:3:30:4:120; therefore, the recommended application rate of the M. lutarioriparius soil conditioner was 6.25 t·hm-2. Three experimental treatments, whose compositions were close to the above optimum interaction ratio, were used to determine the application effect of M. lutarioriparius soil conditioner on rice yield. Results showed that application of the three tested treatments could decrease the Cd content of rice plants to 0.88~1.65 mg·kg-1 with a Cd reduction potential of 54.4%~75.7%, and of rice grains with husk to 0.13~0.17 mg·kg-1 with a Cd reduction potential of 45.2%~58.1%. Additionally, applications of all three treatments could increase the rice grain yields with the highest potential of 1.89 t·hm-2( i.e., increasing rate of 34.8%). These results proved that the M. lutarioriparius biochar-based soil conditioner could decrease the rice Cd content and enhance the rice yield simultaneously, indicating a huge market potential. |
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