新疆博斯腾湖北岸不同地表条件下土壤呼吸特征研究
发布时间：2019-07-09 20:12
【摘要】：土壤呼吸作用是土壤产生并向大气释放二氧化碳的过程,土壤呼吸是碳循环的重要途径,土壤本身的呼吸促进了土壤与大气间的CO2交换。土壤呼吸作用是陆地生态系统碳收支中最大的通量.因此,精确预测陆地与大气之间碳交换需要深入理解影响土壤呼吸作用的主导因子。本研究采用LI-8100开路式自动土壤碳通量测量系统,于2014年4月、7月、10月在新疆博斯腾湖北岸对裸露浅滩地、裸露过渡带、芦苇群落、柽柳群落进行土壤呼吸的测定并对影响土壤呼吸速率的主要环境因素进行观测,总结出各样地土壤呼吸速率的日变化特征和不同时期土壤呼吸速率的变化规律,分析了影响土壤呼吸速率的主要环境因素,探究了各因素对土壤呼吸速率影响的机理。研究表明:1、四个样地土壤呼吸速率的日变化的对比,发现日变化中4月、7月、10月裸露浅滩地分别表现为单峰、双峰、单峰型曲线,峰值出现的时间均在12:00-16:00;裸露过渡带均表现为单峰型,峰值出现的时间均在12:00-16:00;芦苇群落表现为单峰、双峰、单峰型曲线,峰值出现的时间均在12:00-16:00;柽柳群落表现为单峰、双峰、单峰型曲线,峰值出现的时间均在12:00-16:00。由此可以看出,四个样地峰值出现的时间段是一致的,裸露浅滩地、芦苇群落、柽柳群落日变化的峰型相同的。2、不同时期不同样地土壤呼吸速率的特征表现为:裸露浅滩地土壤呼吸速率均值的最大值出现在4月,而其他样地都出现在7月,大小顺序为7月10月4月。在对近地面温度和5cm深度土壤温度与土壤呼吸速率做对比分析时发现,温度指标的最大值也出现在7月,与呼吸速率最大值出现的时间一致,三个月中最小值出现在了温度最低时。3、温度与土壤呼吸速率基本呈现显著相关,但也有个别月份相关性不明显。裸露浅滩地、裸露过渡带、芦苇群落、柽柳群落4月、7月、10月的土壤呼吸速率与近地面温度和5cm深度土壤温度呈现显著相关,与10cm深度土壤温度和25cm深度土壤温度不存在显著关系。4、土壤呼吸速率与空气相对湿度的关系分析发现,裸露浅滩地和裸露过渡带4月、10月土壤呼吸速率与空气相对湿度没有相关性,裸露浅滩地7月土壤呼吸速率随空气相对湿度的变化呈现相反的趋势变化;裸露过渡带4月土壤呼吸速率与空气相对湿度没有相关性,7月和10月土壤呼吸速率随空气相对湿度的变化呈现显著负相关;芦苇群落在4月时土壤呼吸速率与空气相对湿度呈现了显著相关性,7月和10月土壤呼吸速率随空气相对湿度的变化呈现显著负相关。柽柳群落4月的土壤呼吸速率与相对空气湿度之间没有相关关系,7月、10月土壤呼吸速率与空气相对湿度显著负相关。5、各样地土壤呼吸速率与表层含水量、10cm深度含水量、25cm深度含水量不存在显著相关性,除了裸露过渡带的土壤呼吸速率与表层含水量存在显著相关性,土壤各层含水量与土壤呼吸速率呈较好的二次方程关系。6、土壤呼吸速率与风速相关分析,结果发现各月土壤呼吸速率与风速的相关系数分别为0.275、-0.164、0.393,表明土壤呼吸速率与风速在4月、7月、10月时相关性较低。三次方程拟合发现4月和10月土壤呼吸速率和风速的相关性较弱,而7月的相关性较高为0.85。
[Abstract]:The soil respiration is the process of producing and releasing carbon dioxide to the atmosphere, and the respiration of the soil is an important way of carbon circulation, and the respiration of the soil promotes the CO2 exchange between the soil and the atmosphere. The soil respiration is the largest flux in the carbon budget of the terrestrial ecosystem. Therefore, it is necessary to accurately predict the carbon exchange between the land and the atmosphere in order to understand the main factors that affect the respiration of the soil. In this study, an LI-8100 open-circuit type automatic soil carbon flux measurement system was adopted, in April, July and October,2014, the bare shoal land, the bare transitional zone and the reed community were put on the north bank of Bosten Lake, Xinjiang, in October and October,2014. The soil respiration was measured and the main environmental factors that affected the respiration rate of the soil were observed. The diurnal variation characteristics of soil respiration rate and the change of soil respiration rate in different periods were summarized, and the main environmental factors that affected the respiration rate of the soil were analyzed. The mechanism of the influence of various factors on the respiration rate of soil was explored. The results showed that:1. The diurnal variation of the soil respiration rate in the four samples showed a single peak, a double peak and a unimodal curve in April, July and October, respectively. The peak appeared in 12:00-16:00, and the exposed transition zone was unimodal. The peak appeared at 12:00 to 16:00, and the reed community showed a single peak, a double peak and a unimodal curve. The peak of the peak appeared at 12:00 to 16:00, and the peak of the peak was 12:00 to 16:00. As a result, it can be seen that the time period of the peak occurrence of the four samples is the same, and the peak-type of the diurnal variation of the reed community and the willows community is the same, and the characteristics of the different periods of different soil respiration rates are as follows: The maximum value of the mean value of the soil respiration rate in the bare shoal was in April, and the other was in July, with the order of magnitude of July, October. in comparison and analysis of that temperature of the near ground and the soil respiration rate at the depth of 5 cm, it was found that the maximum value of the temperature index was also in July, and the minimum value in the three-month period was the lowest when the temperature was the lowest.3, There was a significant correlation between the temperature and the respiration rate of the soil, but the correlation between the temperature and the soil respiration rate was not obvious. The soil respiration rate of the bare shoal land, the bare transitional zone, the reed community and the willows community was significantly correlated with the near-surface temperature and the 5 cm depth soil temperature in April, July and October, and there was no significant relationship with the soil temperature of 10 cm and the soil temperature of 25 cm. The relationship between the respiration rate of the soil and the relative humidity of the air found that the respiration rate of the soil in the bare shoal area and the bare transitional zone was not related to the relative humidity of the air in April and October, and the respiration rate of the soil in July of the bare shoal was changed with the change of the relative humidity of the air. There was no correlation between the respiration rate of the soil and the relative humidity of the air in April, and the respiration rate of the soil in July and October was negatively correlated with the change of the relative humidity of the air. The respiration rate of the reed community was significantly correlated with the relative humidity of the air in April, and the respiration rate of the soil was negatively correlated with the change of the relative humidity of the air in July and October. There was no correlation between the respiration rate of the soil and the relative air humidity in April, and there was a negative correlation between the respiration rate of the soil and the relative humidity of the air in July and October, and the respiration rate of the soil and the water content of the surface layer, the water content of 10 cm and the water content of the depth of 25 cm did not have significant correlation. in addition to the significant correlation between the soil respiration rate and the water content of the surface layer in the exposed transition zone, the water content of each layer of the soil and the respiration rate of the soil are in a good quadratic equation, and the soil respiration rate and the wind speed are analyzed, The results showed that the correlation coefficient between the respiration rate and the wind speed of the soil was 0.275,-0.164 and 0.393, respectively, indicating that the correlation between the respiration rate and the wind speed of the soil was lower in April, July and October. The three-time equation fit found that the correlation between the soil respiration rate and the wind speed in April and October was weak, while the correlation in July was higher than 0.85.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S154
本文编号：2512416
[Abstract]:The soil respiration is the process of producing and releasing carbon dioxide to the atmosphere, and the respiration of the soil is an important way of carbon circulation, and the respiration of the soil promotes the CO2 exchange between the soil and the atmosphere. The soil respiration is the largest flux in the carbon budget of the terrestrial ecosystem. Therefore, it is necessary to accurately predict the carbon exchange between the land and the atmosphere in order to understand the main factors that affect the respiration of the soil. In this study, an LI-8100 open-circuit type automatic soil carbon flux measurement system was adopted, in April, July and October,2014, the bare shoal land, the bare transitional zone and the reed community were put on the north bank of Bosten Lake, Xinjiang, in October and October,2014. The soil respiration was measured and the main environmental factors that affected the respiration rate of the soil were observed. The diurnal variation characteristics of soil respiration rate and the change of soil respiration rate in different periods were summarized, and the main environmental factors that affected the respiration rate of the soil were analyzed. The mechanism of the influence of various factors on the respiration rate of soil was explored. The results showed that:1. The diurnal variation of the soil respiration rate in the four samples showed a single peak, a double peak and a unimodal curve in April, July and October, respectively. The peak appeared in 12:00-16:00, and the exposed transition zone was unimodal. The peak appeared at 12:00 to 16:00, and the reed community showed a single peak, a double peak and a unimodal curve. The peak of the peak appeared at 12:00 to 16:00, and the peak of the peak was 12:00 to 16:00. As a result, it can be seen that the time period of the peak occurrence of the four samples is the same, and the peak-type of the diurnal variation of the reed community and the willows community is the same, and the characteristics of the different periods of different soil respiration rates are as follows: The maximum value of the mean value of the soil respiration rate in the bare shoal was in April, and the other was in July, with the order of magnitude of July, October. in comparison and analysis of that temperature of the near ground and the soil respiration rate at the depth of 5 cm, it was found that the maximum value of the temperature index was also in July, and the minimum value in the three-month period was the lowest when the temperature was the lowest.3, There was a significant correlation between the temperature and the respiration rate of the soil, but the correlation between the temperature and the soil respiration rate was not obvious. The soil respiration rate of the bare shoal land, the bare transitional zone, the reed community and the willows community was significantly correlated with the near-surface temperature and the 5 cm depth soil temperature in April, July and October, and there was no significant relationship with the soil temperature of 10 cm and the soil temperature of 25 cm. The relationship between the respiration rate of the soil and the relative humidity of the air found that the respiration rate of the soil in the bare shoal area and the bare transitional zone was not related to the relative humidity of the air in April and October, and the respiration rate of the soil in July of the bare shoal was changed with the change of the relative humidity of the air. There was no correlation between the respiration rate of the soil and the relative humidity of the air in April, and the respiration rate of the soil in July and October was negatively correlated with the change of the relative humidity of the air. The respiration rate of the reed community was significantly correlated with the relative humidity of the air in April, and the respiration rate of the soil was negatively correlated with the change of the relative humidity of the air in July and October. There was no correlation between the respiration rate of the soil and the relative air humidity in April, and there was a negative correlation between the respiration rate of the soil and the relative humidity of the air in July and October, and the respiration rate of the soil and the water content of the surface layer, the water content of 10 cm and the water content of the depth of 25 cm did not have significant correlation. in addition to the significant correlation between the soil respiration rate and the water content of the surface layer in the exposed transition zone, the water content of each layer of the soil and the respiration rate of the soil are in a good quadratic equation, and the soil respiration rate and the wind speed are analyzed, The results showed that the correlation coefficient between the respiration rate and the wind speed of the soil was 0.275,-0.164 and 0.393, respectively, indicating that the correlation between the respiration rate and the wind speed of the soil was lower in April, July and October. The three-time equation fit found that the correlation between the soil respiration rate and the wind speed in April and October was weak, while the correlation in July was higher than 0.85.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：S154
【参考文献】
相关期刊论文 前3条
1 陈书涛;刘巧辉;胡正华;刘艳;任景全;谢薇;;不同土地利用方式下土壤呼吸空间变异的影响因素[J];环境科学;2013年03期
2 王小国;朱波;王艳强;郑循华;;不同土地利用方式下土壤呼吸及其温度敏感性[J];生态学报;2007年05期
3 孟好军;刘贤德;金铭;雷玉明;董晓丽;;祁连山不同森林植被类型对土壤微生物影响的研究[J];土壤通报;2007年06期
，本文编号：2512416
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