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华北平原麦田土壤呼吸特征 预览 被引量:105

Soil respiration characteristics in winter wheat field in North China Plain
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摘要 采用静态箱/气相色谱(GC)法测定了华北平原典型冬小麦田的土壤呼吸速率.结果表明,土壤呼吸速率日变化呈单峰曲线,最高峰出现在13:00左右,最低点在凌晨4:00左右;冬小麦生长季土壤呼吸速率平均冬季较低,夏季较高,与地温的季节变化趋势基本一致;随氮肥用量增加土壤呼吸增强,但增幅不大,秸秆还田处理的土壤呼吸作用明显高于秸秆不还田处理和氮肥处理;土壤呼吸同地温存在着显著的指数关系,其中5 cm地温同土壤呼吸相关性最好.不同处理、不同深度土层具有不同的Q10值,Q10值随土壤的性状、地温测量的深度和微生物活动的土层深度变化而改变,其本身是温度的函数,随着温度的升高,Q10值呈下降趋势;土壤呼吸与土壤水分的关系较弱,未表现出明显的规律性;冬小麦平均净光合速率与土壤呼吸速率呈相似的变化趋势,从小麦返青到腊熟,冬小麦田表现为CO2的汇. Experiments were conducted at the Yucheng Comprehensive Experimental Station of the Chinese Academy of Sciences during 2002~2003 to investigate the respiration of a pulverous sandstone soil under cultivation of winter wheat over a growth season.The effluent CO 2 was collected and analyzed by the static-chamber/gas chromatography(GC)method at a frequency of once a week in spring and autumn,once two weeks in winter,twice a week for straw manure treatment,once a week for no straw manure treatment and nitrogen fertilization treatment in summer.The results indicated that diurnal variation of soil respiration rate showed a single peak in typical winter wheat farmlands in the North China Plain,and reached the highest at about 13 o'clock,and the lowest at about 4 o'clock in the early morning.In winter wheat growth season,the soil respiration rate was 31.23~606.85 mg·m -2 ·h -1 under straw manure,28.99~549.66 mg·m -2 ·h -1 under no straw manure,10.46~590.86 mg·m -2 ·h -1 in N 0,16.11~349.88 mg·m -2 ·h -1 in N 100 ,12.25~415.00 mg·m -2 ·h -1 in N 200 ,and 23.01~410.58 mg·m -2 ·h -1 in N 300 ,showing a similar seasonal variation tendency with soil temperature.Among all treatments,the straw manure had the most distinct soil respiration,though the soil respiration also increased slightly with increasing nitrogen fertilization.Soil respiration increased exponentially with increasing soil temperature,and the correlation of soil temperature at the depth of 5 cm was the best.This relationship was usually described with the Q 10 model,which represented the sensitivity of soil respiration to temperature.Q 10 was not a fixed value,which varied with the depth at which the temperature was measured and the depth of the active soil layer and soil temperature.At same time,the Q 10 value decreased with increasing soil temperature.Soil water content was another important factor affecting soil respiration rate,but in this region,the
作者 陈述悦 李俊 陆佩玲 王迎红 于强 CHEN Shuyue 1,LI Jun 2,LU Peiling 1 ,WANG Yinghong 3,YU Qiang 2 ( 1College of Resource and Environment,Beijing Forestry University,Beijing 100083,China; 2Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing 100101,China; 3Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China)
出处 《应用生态学报》 CAS CSCD 2004年第9期 1552-1560,共9页 Chinese Journal of Applied Ecology
基金 中国科学院知识创新工程项目
关键词 华北平原 冬小麦 土壤呼吸速率 Q10模型 秸秆还田 North China Plain, Winter wheat, Soil respiration rate, Q 10 model, Straw manure.
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参考文献44

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