摘要
【目的】探讨添加生物炭对先后2次施氮砖红壤N_2O排放的影响,为生物炭还田施氮技术提供科学依据。【方法】利用室内培养试验,按砖红壤风干土质量的0、1%和2%水平添加生物炭,各处理先后2次施入等量氮,施氮后观测土壤N_2O排放及土壤理化性质变化。【结果】土壤pH、阳离子交换量(CEC)和土壤有机碳、速效磷、速效钾和全氮含量随着生物炭添加量的增加而增加。第1次施氮后,生物炭添加促进土壤硝化作用,显著降低施肥后土壤NH_4~+-N含量(P<0.05),增加土壤NO_3~--N含量。相比对照,添加生物炭显著降低第1次施氮后N_2O排放(P<0.05),降低幅度随生物炭用量增加而增加。第2次施氮,生物炭反而促进N_2O排放。综合2次施氮后N_2O的排放总量,相比对照,添加生物炭仍显著降低N_2O排放。【结论】施用生物炭显著改善土壤肥力,提高土壤保肥性能和减轻酸化程度。配合水分管理,可有效实现N_2O减排。
[Purpose] This study was aimed to investigate the effects of biochar on the nitrous oxide(N2O) emission after two times of N application in latosol soil and provide basis for biochar and nitrogen fertilizer application. [Methods] An incubation experiment with two times of the same amount of N fertilizer application after each 0, 1% and 2%(m/m) levels of biochar application was conducted to measure N2O emission and related soil properties. [Results] The soil pH, cation exchange capacity(CEC), soil organic carbon, available P, available K and total N increased with the rate of biochar application. Biochar application promoted nitrification which significantly decreased NH4+-N(P<0.05) and increased NO3--N concentrations. Biochar application decreased N2O emission after the first time of N fertilizer application(P<0.05), the higher the rate of biochar application was,the greater the reduction of N2O emission was. However, biochar application promoted N2O emission after the second time of N fertilizer application. Biochar application decreased total N2O emission in the combination two times of N2O emission. [Conclusion] Biochar application significantly improved soil productivity and soil fertility, and alleviated soil acidification. Combined with water management, biochar application can mitigate N2O emission.
作者
曹明
潘凤娥
伍延正
孟磊
何秋香
柯用春
CAO Ming;PAN Feng'e;WU Yanzheng;MENG Lei;HE Qiuxiang;KE Yongchun(Sanya Academy for Science and Technology of Crop Winter Multiplication,Sanya 572000,China;College of Tropical Crops,Hainan University,Haikou 570228,China)
出处
《云南农业大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第2期338-344,共7页
Journal of Yunnan Agricultural University:Natural Science
基金
国家重点研发计划(2018YFD0200305)
国家自然科学基金项目(41661051,41807022)
海南省重大科技专项(ZDKJ2017002)
海南省自然科学基金(317070)。
关键词
生物炭
N_2O
分次施肥
硝化作用
biochar
N2O
splitting application of fertilizer
nitrification
