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半湿润地区土垫旱耕人为土不同土层氮矿化的水温效应研究

Effects of temperature and water condition on soil nitrogen mineralization of different layers in Eum-Orthic Anthrosols of sub-humid area

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【作者】 沈玉芳李世清邵明安

【Author】 SHEN Yu-fang~(1,3),LI Shi-qing~(1,2*),SHAO Ming-an~(1,2)(1 State Key Laboratory of Soil Erosion and Dryland Farming on Loess Plateau,Northwest Sci-Tech University of Agriculture and Forestry;2 Institute of Soil and Water Conservation,Chinese Academy of Sciences and Ministry of Water Resource;3 College of Resource and Environment,Northwest Sci-Tech University of Agriculture and Forestry,Yangling,Shaanxi 712100,China)

【机构】 西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室西北农林科技大学黄土高原土壤侵蚀与旱地农业国家重点实验室 陕西杨凌712100西北农林科技大学资源与环境学院陕西杨凌712100中国科学院水利部水土保持研究所

【摘要】 本论文以半湿润地区土垫旱耕人为土(褐土)为供试土样,应用长期通气培养法,研究了湿度和温度对0—90cm土壤剖面不同土层(每30 cm为1土层)氮素矿化的影响。每层土壤设11.0、15.0、19.0、23.0、27.0%5个土壤水分等级和8.0、16.0、24.03、2.0、40.0℃5个温度等级,共25个处理,在恒温培养箱中进行培养。培养期间分别在7、14、21、354、9、63和84 d取样测定矿化氮累积量。结果表明,不同土层土壤有机氮的矿化累积量均随温度、水分含量升高而增加,各土层增幅的大小顺序为0—30 cm>30—60 cm>60—90 cm。0—30 cm土层矿化氮是0—90 cm土层可矿化氮的主体,其矿化氮占67.9%。不同土层土壤氮素矿化过程不同:在培养期间0—30 cm土层氮素矿化量与培养时间符合线性关系,而30—60 cm和60—90 cm土层符合对数函数;不同土层氮素矿化速率k与含水量w间为直线关系,相关系数r在0.93以上,0—30 cm土层的k值对温度反应最为敏感,其次为30—60 cm土层,以60—90cm土层反应最小。总体上看,在较高温度培养条件下,随温度增加,土层越深,矿化速率增加越慢;温度和水分对不同土层土壤氮素矿化具有明显的正交互作用。对0—30 cm土层,在高温情况下水分效果更加突出;而对30—60cm和60—90 cm土层,温度效应比水分效果更加突出。

【Abstract】 Aerobic incubation experiment was conducted with Eum-Orthic Anthrosols(Cinnamon soils)of sub-humid area to study the effects of temperature and water condition on soil N mineralization of 0—90 cm soil layer which was divided into three layers(each 30 cm thick).Soil samples were incubated at different temperature of 8.0,16.0,24.0,32.0,40.0℃ in tubers,and water contents were adjusted to 11.0%,15.0%,19.0%,23.0%,27.0%(w/w),sampling 7,14,21,35,49,63, 84 days after incubation,respectively.The results showed that N mineralization accumulation quantity of all soil layers increased with the increase of temperature and water content,in the order of 0—30 cm>30—60 cm>60—90 cm.Mineralizable N of the 0—30 cm soil layer was the major part,which accounted for 67.9% of total amount in 0—90 cm soil layer.Every soil layer had different mineralization process: mineralization process of 0—30 cm soil layer could be described with linear equation and 30—60 cm and 60—90 cm soil layers with logarithm equation during incubation.Statistical analysis significant correlation was obtained between the soil N mineralization rate(k) and water content(w),which correlation coefficient was above 0.93.It was found that soil N mineralization rate of 0—30 cm soil layer was most sensitive to temperature,30—60 cm was less,and 60—90 cm was least.As a whole,under the condition of higher incubation temperature,the N mineralization rate would be shower with the increase of temperature and soil layer depth. Temperature and water content of soil had interactive effects on the quantity and rate of N mineralization.To 0—30 cm soil layer,the positive effect of moisture on N mineralization was more evident than temperature under the higher incubation temperature,while to 30—60 cm and 60—90 cm,the effect of temperature was more evident.

【基金】 国家自然科学基金(30571116,30230230);西北农林科技大学创新团队项目资助
  • 【文献出处】 植物营养与肥料学报 ,Plant Nutrition and Fertilizer Science , 编辑部邮箱 ,2007年01期
  • 【分类号】S153
  • 【被引频次】49
  • 【下载频次】427
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