生物炭和秸秆添加对海南热带水稻土氮素淋溶的影响
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朱启林(1991-),男,在读博士研究生,主要从事土壤氮循环研究。E-mail:1017023948@qq.com

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X704;S511

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国家自然科学基金项目(42067008,41701267);海南省自然科学基金高层次人才项目(320RC493)


Effect of Biochar and Straw Addition on Nitrogen Leaching of Tropical Paddy Soil in Hainan
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    摘要:

    通过室内土柱模拟淋洗试验,研究不同水分条件下添加秸秆和生物炭对海南热带水稻土氮淋失的影响。物料添加设对照(CK)、添加生物炭(B)、生物炭+水稻秸秆(BCS)、水稻秸秆(CS)4个处理,培养水分设75%田间持水量(WHC,模拟旱作土壤)和淹水(模拟水田)2个水平。结果表明,生物炭和秸秆添加均可以提高土壤pH,增加土壤有机质、全氮、速效钾和有效磷含量。75%WHC条件下,相比CK,BCS和CS处理显著增加土壤NH4+—N的淋失量,分别增加16.30%和48.56%,B处理无显著差异;CS处理增加土壤NO3-—N淋失,BCS处理降低土壤NO3-—N淋失,B处理对硝、铵态氮淋失无显著影响;BCS和CS处理显著增加土壤硝、铵态氮总量(S)淋失,B处理对S无显著影响。淹水条件下,相比CK,B处理降低土壤的NH4+—N和S的淋失,分别降低16.30%和12.81%,而对NO3-—N淋失量无显著影响;CS处理土壤降低土壤NH4+—N、NO3-—N和S的淋失,分别降低19.26%,33.96%和22.37%;BCS处理降低土壤NH4+—N和S的淋失,分别降低14.52%和14.19%,但对NO3-—N淋失影响不显著。综上,海南热带地区稻菜轮作种植模式下,旱作条件秸秆还田增加土壤NH4+—N和NO3-—N的淋失,但生物炭对硝、铵态氮淋失无影响;水田时,生物炭添加可以降低土壤NH4+—N淋失,对NO3-—N无影响,秸秆还田后土壤NH4+—N和NO3-—N的淋失均降低。

    Abstract:

    An indoor soil column simulation experiment was conducted to examine the effect of adding straw and biochar on the nitrogen leaching loss of Hainan tropical paddy soil under different moisture conditions. Four treatments were set up: control (CK), addition of biochar (B), biochar + rice straw (BCS), and rice straw (CS) at two moisture condition: 75% field water holding capacity (WHC, simulated dry farming soil) and flooding conditions (simulated paddy field). The results showed that both biochar and straw addition could increase soil pH, soil organic matter, total nitrogen, available potassium and available phosphorus contents. Under 75% WHC conditions, compared with CK, BCS and CS treatments significantly increased soil NH4+—N leaching by 16.30% and 48.56% respectively, and no significant difference was found in B treatment. The treatment of CS increased soil NO3-—N leaching compared with CK, and BCS treatment reduced soil NO3-—N leaching, while there was no significant difference in B treatment. BCS and CS treatments significantly increased soil nitrate-ammonium nitrogen (S) leaching compared with CK, while there was on significant effect in B treatment. Under flooding conditions, compared with CK, the leaching loss of NH4+—N and S in the soil was reduced by 16.30% and 12.81%, respectively, but had no significant effect on the NO3-—N leaching loss in B treatment. CS treatment significantly decreased the leaching loss of soil NH4+—N, NO3-—N and S by 19.26%, 33.96% and 22.37%, respectively. BCS treatment reduced the leaching loss of soil NH4+—N and S by 14.52% and 14.19%, respectively, but had no influence of NO3-—N leaching. In summary, returning straw to the field under dry farming conditions would increase soil leaching loss of NH4+—N and NO3-—N, but biochar had no effect on nitrate ammonium leaching under the rice-vegetable rotation planting model in tropical areas of Hainan. In the paddy field, biochar could reduce the leaching loss of NH4+—N, but had no effect on NO3-—N, while the straw could decrease the leaching loss of NH4+—N and NO3-—N.

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朱启林, 刘丽君, 张雪彬, 伍延正, 汤水荣, 曹明, 柯用春, 孟磊, 何秋香.生物炭和秸秆添加对海南热带水稻土氮素淋溶的影响[J].水土保持学报,2021,35(4):193~199

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  • 收稿日期:2021-01-20
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  • 在线发布日期: 2021-07-20
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