文章摘要
张泽洲, 王冬梅, 李梦寻.干湿交替程度对土壤速效养分的影响[J].水土保持学报,2021,35(2):265~270
干湿交替程度对土壤速效养分的影响
Effect of Drying-rewetting Intensity on Soil Nutrient Availability
投稿时间:2020-10-21  
DOI:10.13870/j.cnki.stbcxb.2021.02.035
中文关键词: 干湿交替程度  速效养分  水溶性有机碳
英文关键词: drying-rewetting intensity  nutrient availability  DOC
基金项目:国家“十二五”科技支撑计划项目(2012BAC16B03);宁夏回族自治区水利厅科技项目(2012-69)
作者单位E-mail
张泽洲, 王冬梅, 李梦寻 北京林业大学水土保持学院, 北京 100083 dmwang_bjfu@126.com 
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中文摘要:
      降雨和灌溉引起的干湿交替显著影响土壤速效养分的转化和迁移。为了探究干湿交替程度对土壤速效养分的影响,采用室内模拟干湿交替试验,设置轻度 (DW1,复水至60% WHC)、中度 (DW2,复水至45% WHC)、重度 (DW3,复水至30% WHC) 3种干湿交替程度,并以恒湿处理 (CM,恒定60% WHC)为对照,探究试验前后土壤pH、水溶性有机碳(dissolved organic carbon, DOC)、铵态氮、硝态氮、速效磷及速效钾的变化。结果表明:DW1土壤pH比其他各组低0.25~0.45,其余各组间差异不显著;培养后CM组DOC下降20.01%,DW组下降37.04%~41.36%,不同程度干湿交替处理间差异不显著。土壤铵态氮含量在培养后下降18.19%~42.02%,各处理间表现为DW3>DW2>DW1;土壤硝态氮含量较培养前急剧增长,表现为DW1>DW2>DW3,DW2的铵态氮和硝态氮含量与CM组基本一致。土壤速效钾和速效磷培养前后变化不大,但DW2速效磷含量较其他各处理减少2.93~4.00 mg/kg,而DW3的速效钾含量较其他各处理减少3.69~14.72 mg/kg。干湿交替显著降低土壤DOC和铵态氮含量,增加土壤硝态氮含量,对土壤pH、速效磷、速效钾影响不大。干湿交替程度的增强能提高土壤pH,促进铵态氮的产生,抑制硝态氮和速效钾的生成,但对DOC和速效磷影响不大。
英文摘要:
      Drying and rewetting cycles caused by rainfall and irrigation influence the availability of soil nutrient. In order to estimate the effects of drying-rewetting intensity on nutrient availability, three moisture treatments (rewetting to 60%,45% and 30% WHC) were designed in this study compared with a constantly moist control (CM, 60% WHC during the whole incubation period). The pH of DW1 (rewetting to 60% WHC) was 0.25~0.45 lower than other treatments while the differences among other treatments were not significant. After incubation, the DOC in CM decreased by 20.01%, while decreased by 37.04%~41.36% in drying-rewetting treatments, and there were no significant differences among different intensities. The ammonium nitrogen decreased by 18.19%~42.02% in the drying-rewetting treatments, but the reduction came down with the increasing intensity. The nitrate nitrogen increased sharply in each treatment but the increase came down with the increasing intensity. The ammonium nitrogen and nitrate nitrogen in DW2 (rewetting to 45% WHC) were consistent with CM. Available P and available K had little change after the incubation, but available P in DW2 was lower than other treatments as well as available K in DW3 (rewetting to 30% WHC). Drying-rewetting cycles led to a reduction of DOC and ammonium nitrogen and an increase of nitrate nitrogen but had little effect on pH, available P and available K. Following the growth of drying-rewetting intensity, soil pH and ammonium nitrogen gradually increased, while nitrate nitrogen and available K decreased.
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