1. 西北农林科技大学资源环境学院, 陕西 杨凌,712100
2. 中国科学院水利部水土保持研究所, 陕西 杨凌,712100
[ "刘晶(1997—),女,硕士研究生,主要从事土壤化学与环境研究。E-mail:1534171045@qq.com" ]
纸质出版:2022
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刘晶, 郑利芳, 王颖, 等. 减氮和秸秆还田对旱地土壤微生物和硝化潜势的影响[J]. 水土保持学报, 2022,36(4):309-315.
LIU Jing, ZHENG Lifang, WANG Ying, et al. Effects of Nitrogen Reduction and Straw Returning on Dryland Soil Microbes and Nitrification Potential[J]. 2022, 36(4): 309-315.
刘晶, 郑利芳, 王颖, 等. 减氮和秸秆还田对旱地土壤微生物和硝化潜势的影响[J]. 水土保持学报, 2022,36(4):309-315. DOI: 10.13870/j.cnki.stbcxb.2022.04.038.
LIU Jing, ZHENG Lifang, WANG Ying, et al. Effects of Nitrogen Reduction and Straw Returning on Dryland Soil Microbes and Nitrification Potential[J]. 2022, 36(4): 309-315. DOI: 10.13870/j.cnki.stbcxb.2022.04.038.
通过3年田间试验,研究减氮和秸秆还田对黄土高原南部旱地春玉米产量、硝态氮残留量及微生物学特性等指标的影响。研究共设置不施肥(CK)、传统施氮(N250)、传统施氮配合秸秆还田(N250+S)、减氮20%(N200)、减氮20%配合秸秆还田(N200+S)5个处理。结果表明:(1)连续3年减氮20%和秸秆还田可以提高玉米产量,阻控土壤硝态氮淋溶,N200较N250处理玉米增产5.9%,N200+S较N200处理玉米增产7.4%,N250+S较N250处理玉米增产9.1%;0-300 cm土层,N200较N250处理硝态氮残留量减少51.3%,N200+S较N200处理硝态氮残留量减少18.0%,N250+S较N250处理硝态氮残留量减少41.2%。(2)减氮和秸秆还田是调控土壤硝化潜势的有效措施,N200较N250处理硝化潜势降低8.8%,N250+S较N250处理硝化潜势降低14.2%,N200+S较N200处理硝化潜势降低20.4%。(3)秸秆还田显著提高土壤微生物量碳氮(SMBC、SMBN)含量,N250+S较N250处理SMBC、SMBN分别显著增加17.5%和24.0%,N200+S较N200处理SMBC、SMBN分别显著增加18.4%和31.3%。(4)施氮和秸秆还田对氨氧化古菌(AOA)影响较小,但增加了氨氧化细菌(AOB)数量。(5)氨氧化细菌(AOB)丰度与硝态氮、铵态氮、土壤微生物量碳氮(SMBC、SMBN)和硝化潜势均呈极显著正相关,而氨氧化古菌(AOA)丰度和影响因子没有明显的相关性。研究结果可为黄土旱塬春玉米种植区氮肥管理和农业可持续发展提供科学依据。
Through a three-year field experiment
the effects of nitrogen reduction and straw returning on the yield of spring maize
soil nitrate nitrogen and ammonia oxidizing microorganisms in dryland of the southern Loess Plateau were studied. The study set up fivetreatments
including no fertilizer (CK)
traditional nitrogen application (N250)
traditional nitrogen application combined with straw return to field (N250+S)
nitrogen reduction 20% (N200)
and nitrogen reduction 20% combined with straw return (N200+S). The results showed that:(1) Nitrogen reduction by 20% and straw returning to the field for 3 consecutive years can increase maize yield and control soil nitrate leaching.Compared with N250 treatment
N200 treatment increases maize yield by 5.9%
and N200+S treatment increases maize yield compared with N200 treatment 7.4%
compared with N250 treatment
N250+S treatment increased maize yield by 9.1%; In the 0-300 cm soil layer
compared with N250
N200 reduced nitrate nitrogen residue by 51.3%. And the N200+S reduced nitrate nitrogen residue by 18.0% compared with N200. The residual nitrate nitrogen in N250+S was reduced by 41.2% compared with N250. (2) Nitrogen reduction and straw returning reduced soil nitrification potential. Compared with N250
N200 reduced soil nitrification potential by 8.8%
and N250+S reduced it by 14.2%.The soil nitrification potential in N200+S was reduced by 20.4% compared with N200. (3) Returning straw to thefield significantly increased soil microbial biomass carbon and nitrogen (SMBC
SMBN). Compared with N250
the SMBC and SMBN in N250+S were increased by 17.5% and 24.0%
respectively. Compared with N200
SMBC and SMBN in N200+S were increased by 18.4% and 31.3% respectively. (4) Nitrogen application and straw returning had little effect on ammonia oxidizing archaea (AOA)
but increased the abundance of ammonia oxidizing bacteria (AOB). (5) The abundance of ammonia oxidizing bacteria (AOB) was extremely significantly positively correlated with nitrate nitrogen
ammonium nitrogen
SMBC
SMBN and nitrification potential
while ammonia oxidizing archaea (AOA) was abundant. There was no obvious correlation between degree and impact factor.These results could provide a scientific basis for nitrogen fertilizer management and agricultural sustainable development in the spring maize planting area of the Loess Plateau.
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