地膜和秸秆覆盖对冻融期土壤硝态氮迁移与分布的影响
发布时间：2018-12-11 09:51
【摘要】：为了揭示地面覆盖对冻融期土壤硝态氮迁移与分布的影响,试验分别设置裸地(LD)、地膜覆盖(MD)和秸秆覆盖(JD)3种地表处理,运用单因素方差分析(one-way ANOVA)和最小显著差异法(LSD)统计分析冻融期土壤硝态氮的时空变化规律。结果表明,封冻前地表覆盖(MD和JD)显著增加了土壤剖面(0~110cm)的硝态氮质量比,土壤硝态氮的累积效果为MDJDLD;冻结期各处理地块均在土壤相变区(0~60cm)出现硝态氮质量比高值区,LD在土壤冻结过程中的积氮效应(特指硝态氮)最为显著,积氮范围为10~55cm,硝态氮质量比峰值达37.18mg/kg,显著高于MD和JD;消融期MD显著增加土壤剖面硝态氮质量比,最高值达42.38mg/kg。MD和JD有效抑制了冻融期相变区土壤硝态氮质量比的波动程度,其中JD硝态氮质量比的时程变幅小于MD。同时,冻融期MD与LD间硝态氮质量比均差值明显高于JD,且土体通融后,MD、JD和LD为0~60cm土壤硝态氮质量比与封冻前相比分别增加了12.23、6.84和6.57mg/kg,说明MD更有利于硝态氮累积。
[Abstract]:In order to reveal the effect of ground mulch on nitrate nitrogen transport and distribution in frozen and thawed soil, (LD), mulching (MD) and straw mulching (JD) were used in the experiment. Single factor variance analysis (one-way ANOVA) and minimum significant difference method (LSD) were used to analyze the temporal and spatial variation of nitrate in frozen and thawed soil. The results showed that surface cover (MD and JD) significantly increased the mass ratio of nitrate to nitrogen in soil profile (0~110cm) before freezing, and the cumulative effect of soil nitrate nitrogen was MDJDLD;. During the freezing period, all the treatment blocks had high ratio of nitrate to nitrogen in the soil phase change zone (0~60cm), and the effect of LD on nitrogen accumulation during soil freezing was the most significant, and the range of nitrogen accumulation was 10 ~ 55 cm. The peak value of nitrate-nitrogen ratio was 37.18 mg / kg, which was significantly higher than that of MD and JD;. During ablation, MD significantly increased the nitrate-nitrogen mass ratio in soil profile, and the maximum value of 42.38mg/kg.MD and JD effectively inhibited the fluctuation of soil nitrate / nitrogen mass ratio in the phase change zone during freezing and thawing period, and the time-history variation of JD nitrate nitrogen mass ratio was smaller than that of MD.. At the same time, the difference between MD and LD during freezing and thawing period was significantly higher than that between JD, and after soil blending, MD,JD and LD were increased by 12.23 mg / kg and 6.57 mg / kg, respectively, when compared with those before freezing. The results show that MD is more favorable for nitrate accumulation.
【作者单位】： 太原理工大学水利科学与工程学院;
【基金】：国家自然科学基金资助项目(41572239) 高等学校博士学科点专项科研基金资助项目(20131402110008)
【分类号】：S153.6
[Abstract]:In order to reveal the effect of ground mulch on nitrate nitrogen transport and distribution in frozen and thawed soil, (LD), mulching (MD) and straw mulching (JD) were used in the experiment. Single factor variance analysis (one-way ANOVA) and minimum significant difference method (LSD) were used to analyze the temporal and spatial variation of nitrate in frozen and thawed soil. The results showed that surface cover (MD and JD) significantly increased the mass ratio of nitrate to nitrogen in soil profile (0~110cm) before freezing, and the cumulative effect of soil nitrate nitrogen was MDJDLD;. During the freezing period, all the treatment blocks had high ratio of nitrate to nitrogen in the soil phase change zone (0~60cm), and the effect of LD on nitrogen accumulation during soil freezing was the most significant, and the range of nitrogen accumulation was 10 ~ 55 cm. The peak value of nitrate-nitrogen ratio was 37.18 mg / kg, which was significantly higher than that of MD and JD;. During ablation, MD significantly increased the nitrate-nitrogen mass ratio in soil profile, and the maximum value of 42.38mg/kg.MD and JD effectively inhibited the fluctuation of soil nitrate / nitrogen mass ratio in the phase change zone during freezing and thawing period, and the time-history variation of JD nitrate nitrogen mass ratio was smaller than that of MD.. At the same time, the difference between MD and LD during freezing and thawing period was significantly higher than that between JD, and after soil blending, MD,JD and LD were increased by 12.23 mg / kg and 6.57 mg / kg, respectively, when compared with those before freezing. The results show that MD is more favorable for nitrate accumulation.
【作者单位】： 太原理工大学水利科学与工程学院;
【基金】：国家自然科学基金资助项目(41572239) 高等学校博士学科点专项科研基金资助项目(20131402110008)
【分类号】：S153.6
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