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李梦寻,王冬梅,任远,汪西林.不同干湿交替频率对土壤速效养分、DOC的影响.生态学报,2018,(5).http://dx.doi.org/10.5846/stxb201702190268  
不同干湿交替频率对土壤速效养分、DOC的影响
Influence of different drying-rewetting frequency on soil available nutrients and DOC
投稿时间:2017-02-19  修订日期:2017-10-20
DOI: 10.5846/stxb201702190268
关键词干湿交替  频率  速效养分  DOC
Key Wordsdrying-rewetting  frequency  available nutrient  DOC
基金项目“十二五”国家科技支撑计划课题“漓江流域水陆交错带生态修复关键技术与示范”(2012BAC16B03);“西南生态安全屏障决策支撑 技术体系”(2011BAC09B08-07)
作者单位E-mail
李梦寻 北京林业大学 limengxun-tt@163.com 
王冬梅 北京林业大学 dmwang@126.com 
任远 北京林业大学  
汪西林 北京林业大学  
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摘要:
为了探究不同干湿交替频率对速效养分、DOC的影响机理,选择北京褐土(表层0—10 cm土壤)为研究对象,采用室内模拟控制实验法,控制其他变量,设计一系列不同频率的干湿交替实验,在58 d内设置了10 d土壤培育期和48 d试验期,其中48 d试验期设置0、1、2、3、4次干湿交替,试验结束(第58天)进行速效养分、水溶性有机碳(DOC,Dissolved Organic Carbon)等主要土壤速效养分指标测定。采用单因素方差分析与LSD多重比较法进行数据分析,研究结果显示:恒湿组的速效钾、硝态氮含量比干湿交替组高;低频率的干湿交替使得土壤速效钾含量减少,高频率可能在后期出现释钾现象,速效钾含量随着干湿交替频率增加可能会有所增加,趋近恒湿组速效钾水平,4次干湿交替频率是出现速效钾回升的临界次数;硝态氮含量随着频率增加也有增加趋势,低频率的1次干湿交替(DW1,1 drying-rewetting cycle)硝态氮含量最低,高频率的4次干湿交替(DW4,4 drying-rewetting cycles)最高,干湿交替频率增加更频繁的打破平衡,促进矿化,干湿交替组也趋近恒湿组的硝态氮水平。经过干湿交替,土壤中速效钾、铵态氮、DOC的含量下降,硝态氮含量增加,速效磷、pH的变化不明显。在固定时间内(48 d),随着干湿交替的频率增加(从1次到2、3、4次),周期变短(从48 d到24、16、12 d),干燥与湿润的持续时间变短(从24 d到12、8、6 d),干湿交替组的速效钾、硝态氮含量分别趋于恒湿组的速效钾、硝态氮水平。
Abstract:
To investigate the mechanism of influence of different drying-rewetting frequencies on available soil nutrients and DOC,in this study, we collected cinnamon soil at a depth of 0–10 cm below the surface in Beijing and manipulated soil water stress in the laboratory by exposing soil to 0, 1, 2, 3, or 4 drying-rewetting cycles for 58 days, including a 10 day pre-incubation period and a 48 day treatment period. After 58 days, principal soil fertility indexes such as available nutrients and DOC were tested to observe changes as a result of different drying-rewetting frequencies. Data were analyzed using single-factor variance analysis and the Least Significant Difference method (LSD) for the dependent groups. Available K and nitrate nitrogen were lower in the drying and rewetting treatments than in the constantly moist treatment(CM). Low drying-rewetting frequency might lead to the loss of available K, while K release might appear in the late stages of high drying-rewetting frequency conditions. As drying-rewetting frequency increased, the available K also increased. Four drying-rewetting cycles were critical for K release. Increasing the drying-rewetting frequency would result in frequent perturbations to the balance between various forms of nitrogen, and the mineralization rate would increase at the lowest drying-wetting frequency (DW1, 1 drying-rewetting cycle) and the highest drying-wetting frequency (DW4, 4 drying-rewetting cycles). As drying-wetting frequency increased, nitrate nitrogen of drying-rewetting treatment become closer to that of constantly moist (CM). Soil nitrate nitrogen significantly increased, while available K, ammonium nitrogen, and DOC significantly decreased, with drying-wetting frequency, and available P and pH were relatively insensitive to drying-rewetting frequency. In 48 days, with increase in drying-rewetting frequency (from 1 cycle to 2, 3, and 4 cycles) and decrease in drying-rewetting period (from 48 d to 24, 16, and 12 d) and the last period of each drying or wetting period (from 24 d to 12, 8, and 6 d), nitrate nitrogen and available K tended to increase to levels close to those of the constantly moist condition.
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