库布齐沙漠沙柳林下土壤呼吸及土壤有机碳研究

发布时间：2018-04-28 02:30

本文选题：土壤呼吸 + 沙柳　；参考：《内蒙古农业大学》2015年硕士论文

【摘要】：本文在2014年4月、7月和10月利用ACE闭合式土壤呼吸自动监测系统对库布齐沙漠沙柳林和裸沙地的坡下、坡中和坡顶进行24h土壤呼吸动态变化监测,并对3期土壤有机碳、容重、全N和土壤速效N、P、K进行测定。研究库布齐沙漠沙柳林不同坡位土壤呼吸的日、季动态变化规律,环境因子对土壤呼吸的影响以及土壤有机碳含量的时空变化规律,结果显示：(1)沙柳林及裸沙地各坡位土壤呼吸速率的24h日动态变化整体呈现单峰曲线,峰值出现在14：00-16：00之间；6个坡位土壤呼吸日动态变化整体表现为林坡中林坡下林坡顶裸沙坡中裸沙坡下裸沙坡顶的趋势；沙柳林季节性变化表现为7月4月10月,裸沙地则表现为7月10月4月。(2)沙柳林和裸沙地的土壤呼吸与土壤温度表现为正相关关系,土壤温度升高时,促进土壤呼吸作用；沙柳林Q1o值与土壤温度呈现负相关关系,其变化范围在1.645-1.939之间,明显高于裸沙地(1.230-1.589)；土壤呼吸与土壤水分呈现负相关关系,土壤水分含量抑制土壤呼吸速率。(3)沙柳林和裸沙地各坡位不同深度(0-10cm,10-20cm,20-40cm)的土壤有机碳含量整体表现为林坡中林坡下林坡顶裸沙坡中裸沙坡下裸沙坡顶；而各坡位土壤有机碳含量具有较为明显的季节变化趋势,随着时间的推移土壤有机碳含量明显增加且与土壤容重、全N、速效N、P、K等指标均具有较好的相关性。(4)通过对土壤呼吸和土壤有机碳的相关分析,土壤呼吸速率可以解释68.41%-82.02%土壤有机碳含量的变化规律。土壤温度、土壤水分、土壤有机碳含量和全N是影响沙柳林和裸沙地土壤呼吸速率的主要因子。
[Abstract]:In April, July and October 2014, ACE closed soil respiration automatic monitoring system was used to monitor the dynamic changes of soil respiration under slope, slope and top of desert willow forest and bare sandy land in Kubuqi desert, and soil organic carbon and bulk density were measured in three periods. Total N and soil available N P K were determined. The daily and seasonal dynamic changes of soil respiration, the effects of environmental factors on soil respiration, and the temporal and spatial variation of soil organic carbon content in different slope positions of sandy willow forest in Kubuqi desert were studied. The results showed that the 24 h daily dynamic change of soil respiration rate in willow forest and bare sandy land showed a single peak curve. The peak value appeared in the range of 14: 00-16: 00, and the diurnal variation of soil respiration in 6 slope positions showed the trend of bare sand top at the top of bare sand slope in the middle slope of forest slope, and the seasonal change of bare sand slope in sandy willow forest in July, April and October. In bare sandy land, there was a positive correlation between soil respiration and soil temperature in sandy willow forest and bare sandy land, and a negative correlation between Q1o value and soil temperature. The range of variation was between 1.645-1.939, which was significantly higher than that in bare sandy land (1.230-1.589), and there was a negative correlation between soil respiration and soil moisture. Soil moisture content inhibited soil respiration rate. (3) soil organic carbon content in different depth (0-10 cm ~ (10 ~ (-20) cm ~ (20) cm ~ (40) cm) of silt willow forest and bare sand slope in middle forest slope was the whole performance of bare sand slope in middle forest slope. However, the soil organic carbon content in each slope has a more obvious seasonal variation trend, and with the passage of time, the soil organic carbon content increases obviously and is related to the soil bulk density. Through the correlation analysis of soil respiration and soil organic carbon, soil respiration rate can explain the change rule of soil organic carbon content of 68.41- 82.02%. Soil temperature, soil moisture, soil organic carbon content and total N were the main factors affecting soil respiration rate in sandy willow forest and bare sandy land.
【学位授予单位】：内蒙古农业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S714

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