Wang Jiyuan, Riaz Muhammad, Babar Saba, Xia Hao, Li Yuxuan, Xia Xiaoyang, Wang Xiangling, Jiang Cuncang
Microelement Research Center, College of Resources and Environment, Huazhong Agricultural University, Wuhan, Hubei 430070, PR China.
College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, PR China.
Sci Total Environ. 2023 Jun 25;879:163196. doi: 10.1016/j.scitotenv.2023.163196. Epub 2023 Apr 1.
Nitrogen (N) loss poses a great threat to global environmental sustainability. The application of modified biochar is a novel strategy to improve soil nitrogen retention and alleviate the negative effects caused by N fertilizers. Therefore, in this study iron modified biochar was used as a soil amendment to investigate the potential mechanisms of N retention in Luvisols. The experiment comprised five treatments i.e., CK (control), 0.5 % BC, 1 % BC, 0.5 % FBC and 1 % FBC. Our results showed that the intensity of functional groups and surface structure of FBC was improved. The 1 % FBC treatment showed a significant increment in soil NO-N, dissolved organic nitrogen (DON), and total nitrogen (TN) content by 374.7 %, 51.9 %, and 14.4 %, respectively, compared with CK. The accumulation of N in cotton shoots and roots was increased by 28.6 % and 6.6 % with 1 % FBC addition. The application of FBC also stimulated the activities of soil enzymes related to C and N cycling i.e., β-glucosidase (βG), β-Cellobiohydrolase (CBH), and Leucine aminopeptidase (LAP). In the soil treated with FBC, a significant improvement in the structure and functions of the soil bacterial community was found. FBC addition altered the taxa involved in the N cycle by affecting soil chemical properties, especially for Achromobacte, Gemmatimonas, and Cyanobacteriales. In addition to direct adsorption, the regulation of FBC on organisms related to N-cycling also played an important role in soil nitrogen retention.
氮（N）流失对全球环境可持续性构成了巨大威胁。施用改性生物炭是一种提高土壤氮素保持能力并减轻氮肥负面影响的新策略。因此，本研究采用铁改性生物炭作为土壤改良剂，以探究淋溶土中氮素保持的潜在机制。该实验包括五个处理，即CK（对照）、0.5%生物炭（BC）、1% BC、0.5%铁改性生物炭（FBC）和1% FBC。我们的结果表明，FBC的官能团强度和表面结构得到了改善。与CK相比，1% FBC处理使土壤硝态氮（NO₃-N）、溶解有机氮（DON）和总氮（TN）含量分别显著增加了374.7%、51.9%和14.4%。添加1% FBC使棉花地上部和根部的氮积累分别增加了28.6%和6.6%。FBC的施用还刺激了与碳氮循环相关的土壤酶活性，即β-葡萄糖苷酶（βG）、β-纤维二糖水解酶（CBH）和亮氨酸氨肽酶（LAP）。在FBC处理的土壤中，发现土壤细菌群落的结构和功能有显著改善。添加FBC通过影响土壤化学性质改变了参与氮循环的分类群，尤其是无色杆菌属、芽单胞菌属和蓝藻纲。除了直接吸附外，FBC对与氮循环相关生物的调节在土壤氮素保持中也起着重要作用。
