克里雅河流域于田绿洲土壤碳库及转化特征
发布时间：2018-09-12 16:02
【摘要】：土壤碳库是陆地生态系统中最大且周转时间最慢的碳库,它是由有机碳库和无机碳库两大部分组成,在全球碳循环中起着关键作用。当前,环境因子和人类活动交互作用深刻影响着碳库的迁移和转化,并与全球变化存在耦合和反馈机制。土壤碳库及转化特征研究已成为土壤碳循环与全球变化研究的热点领域。本论文以克里雅河流域于田绿洲为典型研究区,在研究土壤碳库特征的基础上,利用相关分析和冗余分析深入探讨土壤碳含量与影响因子之间的相关关系,并通过构建土壤有机碳矿化模型来揭示土壤碳库转化特征,以期全面揭示干旱区绿洲土壤碳库特征,为研究陆地碳循环机制和全球碳收支平衡提供科学依据。主要得出以下研究结论:1.获得绿洲土壤碳库分布特征。结果表明不同土壤类型的有机碳、活性有机碳含量总体分布规律均为灌漠土盐土棕漠土风沙土,无机碳含量总体分布规律为棕漠土盐土灌漠土风沙土,活性无机碳含量总体分布规律是盐土灌漠土风沙土棕漠土。不同土层的有机碳、无机碳含量总体变化规律均为0-10cm10-30cm30-60cm,活性有机碳含量总体变化规律为表层0-10cm含量最大,其他两土层含量相近,活性无机碳含量总体变化规律为10-30cm30-600-10cm。2.获得绿洲内不同土壤类型表层土的理化因子及酶活性变化规律。结果可知土壤水分含量灌漠土最高,地下水埋深灌漠土最浅,风沙土最深,pH值及土壤全盐含量盐土最高;土壤全氮、有效磷含量均为灌漠土最高,速效K则有所不同,表现为盐土最高、灌漠土最低;土壤酶活性均为灌漠土最高。3.结合相关分析及冗余分析,获得土壤碳含量与影响因子的相关关系。影响因子中土壤水分、容重是影响有机碳和无机碳含量的极显著因子;过氧化氢酶、全氮、地下水埋深对有机碳与无机碳含量的影响达到显著水平;有效磷、蔗糖酶和速效钾对有机碳与无机碳含量的整体影响没有达到显著水平;pH、全盐对二者的影响较小。影响因子对有机碳、无机碳含量影响的重要性由大到小依次为:容重土壤水分过氧化氢酶全氮地下水埋深有效磷蔗糖酶速效钾pH全盐。4.构建土壤有机碳矿化模型。通过模型可知不同土壤类型矿化规律为:灌漠土、盐土随着土层深度的增加矿化速率呈现逐渐降低的变化趋势,棕漠土的矿化规律为10-30cm0-10cm30-60cm,风沙土矿化特征与其他三类土壤均不同,矿化速率规律为30-60cm0-10cm10-30cm。不同土层矿化规律为:在0-10cm土层矿化速率为:风沙土灌漠土棕漠土盐土,10-30cm土层矿化速率为:盐土灌漠土棕漠土风沙土,在30-60cm土层矿化速率为风沙土盐土灌漠土棕漠土。
[Abstract]:Soil carbon pool is the largest and slowest carbon pool in terrestrial ecosystem. It is composed of organic carbon pool and inorganic carbon pool and plays a key role in the global carbon cycle. At present, the interaction of environmental factors and human activities has a profound impact on the migration and transformation of carbon pools, and there are coupling and feedback mechanisms with global changes. The study of soil carbon pool and transformation characteristics has become a hot research field of soil carbon cycle and global change. Based on the study of the characteristics of soil carbon pool, the correlation between soil carbon content and influencing factors was studied by correlation analysis and redundancy analysis. Soil organic carbon mineralization model was constructed to reveal the characteristics of soil carbon pool transformation in order to fully reveal the characteristics of soil carbon pool in arid areas and provide scientific basis for the study of terrestrial carbon cycle mechanism and global carbon balance. The main conclusions are as follows: 1. The distribution characteristics of soil carbon pool in oasis were obtained. The results showed that the total distribution law of active organic carbon content in different soil types was that of irrigated desert soil, salt soil, brown desert soil, and inorganic carbon content in brown desert soil, and the total distribution rule of inorganic carbon content was brown desert soil, salt soil, irrigated desert soil and sandy soil. The total distribution law of active inorganic carbon content is salt soil irrigated desert soil wind sand soil brown desert soil. The total change law of organic carbon content in different soil layers is 0-10 cm ~ (-30) cm ~ (30) cm ~ (60) cm ~ (-1). The total change law of active organic carbon content is the largest in surface layer, and the content of other two soil layers is similar. The total change law of active inorganic carbon content is 10-30 cm ~ (-600) -10 cm 路2. The changes of physical and chemical factors and enzyme activity of different soil types in oasis were obtained. The results showed that the soil moisture content was the highest in irrigated desert soil, the most shallow in groundwater depth irrigation desert soil, the highest in soil pH value and total salt content in windy sand soil, the highest in total nitrogen and available phosphorus content in irrigated desert soil, but different in available K content. The soil enzyme activity was the highest in irrigated desert soil and the highest in irrigated desert soil. Based on correlation analysis and redundancy analysis, the correlation between soil carbon content and influencing factors was obtained. Soil moisture and bulk density are the most significant factors affecting organic and inorganic carbon content; catalase, total nitrogen, groundwater depth have significant effects on organic and inorganic carbon content; available phosphorus, P, P, The overall effect of sucrase and available potassium on organic and inorganic carbon content was not significant at pH value, but the total salt had little effect on the content of organic carbon and inorganic carbon. The importance of influencing factors on organic carbon and inorganic carbon content was as follows: bulk soil moisture, catalase, total nitrogen, available phosphorus sucrase, available potassium, pH, total salt. 4. Soil organic carbon mineralization model was constructed. According to the model, the mineralization law of different soil types is: irrigated desert soil, the mineralization rate of salt soil decreases gradually with the increase of soil depth, the mineralization law of brown desert soil is 10-30 cm 0-10 cm 30-60 cm, and the mineralization characteristics of wind-sand soil are different from other three kinds of soil. The mineralization rate is 30-60 cm ~ 10 cm ~ (-10) cm ~ (-30) cm. The mineralization rate of different soil layers is as follows: in 0-10cm soil layer, the mineralization rate is 10 ~ (-30) cm soil layer of aeolian sandy soil, irrigated desert soil, brown desert soil, and in 30-60cm soil layer, the mineralization rate is that of aeolian sandy soil, saline soil, irrigated desert soil, brown desert soil, and that in 30-60cm soil layer, the mineralization rate is that of aeolian sand soil, salt soil, desert soil and brown desert soil.
【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】：S153.6
本文编号：2239523
[Abstract]:Soil carbon pool is the largest and slowest carbon pool in terrestrial ecosystem. It is composed of organic carbon pool and inorganic carbon pool and plays a key role in the global carbon cycle. At present, the interaction of environmental factors and human activities has a profound impact on the migration and transformation of carbon pools, and there are coupling and feedback mechanisms with global changes. The study of soil carbon pool and transformation characteristics has become a hot research field of soil carbon cycle and global change. Based on the study of the characteristics of soil carbon pool, the correlation between soil carbon content and influencing factors was studied by correlation analysis and redundancy analysis. Soil organic carbon mineralization model was constructed to reveal the characteristics of soil carbon pool transformation in order to fully reveal the characteristics of soil carbon pool in arid areas and provide scientific basis for the study of terrestrial carbon cycle mechanism and global carbon balance. The main conclusions are as follows: 1. The distribution characteristics of soil carbon pool in oasis were obtained. The results showed that the total distribution law of active organic carbon content in different soil types was that of irrigated desert soil, salt soil, brown desert soil, and inorganic carbon content in brown desert soil, and the total distribution rule of inorganic carbon content was brown desert soil, salt soil, irrigated desert soil and sandy soil. The total distribution law of active inorganic carbon content is salt soil irrigated desert soil wind sand soil brown desert soil. The total change law of organic carbon content in different soil layers is 0-10 cm ~ (-30) cm ~ (30) cm ~ (60) cm ~ (-1). The total change law of active organic carbon content is the largest in surface layer, and the content of other two soil layers is similar. The total change law of active inorganic carbon content is 10-30 cm ~ (-600) -10 cm 路2. The changes of physical and chemical factors and enzyme activity of different soil types in oasis were obtained. The results showed that the soil moisture content was the highest in irrigated desert soil, the most shallow in groundwater depth irrigation desert soil, the highest in soil pH value and total salt content in windy sand soil, the highest in total nitrogen and available phosphorus content in irrigated desert soil, but different in available K content. The soil enzyme activity was the highest in irrigated desert soil and the highest in irrigated desert soil. Based on correlation analysis and redundancy analysis, the correlation between soil carbon content and influencing factors was obtained. Soil moisture and bulk density are the most significant factors affecting organic and inorganic carbon content; catalase, total nitrogen, groundwater depth have significant effects on organic and inorganic carbon content; available phosphorus, P, P, The overall effect of sucrase and available potassium on organic and inorganic carbon content was not significant at pH value, but the total salt had little effect on the content of organic carbon and inorganic carbon. The importance of influencing factors on organic carbon and inorganic carbon content was as follows: bulk soil moisture, catalase, total nitrogen, available phosphorus sucrase, available potassium, pH, total salt. 4. Soil organic carbon mineralization model was constructed. According to the model, the mineralization law of different soil types is: irrigated desert soil, the mineralization rate of salt soil decreases gradually with the increase of soil depth, the mineralization law of brown desert soil is 10-30 cm 0-10 cm 30-60 cm, and the mineralization characteristics of wind-sand soil are different from other three kinds of soil. The mineralization rate is 30-60 cm ~ 10 cm ~ (-10) cm ~ (-30) cm. The mineralization rate of different soil layers is as follows: in 0-10cm soil layer, the mineralization rate is 10 ~ (-30) cm soil layer of aeolian sandy soil, irrigated desert soil, brown desert soil, and in 30-60cm soil layer, the mineralization rate is that of aeolian sandy soil, saline soil, irrigated desert soil, brown desert soil, and that in 30-60cm soil layer, the mineralization rate is that of aeolian sand soil, salt soil, desert soil and brown desert soil.
【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】：S153.6
【参考文献】
相关期刊论文 前7条
1 宋泽峰;段亚敏;栾文楼;毕攀;;河北平原表层土壤有机碳和无机碳的分布及碳储量估算[J];干旱区资源与环境;2014年05期
2 汪张懿;宗良纲;褚慧;谢少华;杨旎;罗敏;;有机肥分解及其对土壤有机碳矿化影响的模拟研究[J];农业环境科学学报;2013年01期
3 梁轩;汪智军;袁道先;杨平恒;贺秋芳;;岩溶区不同植被下土壤水溶解无机碳含量及其稳定碳同位素组成特征[J];生态学报;2013年10期
4 辜翔;方晰;项文化;李胜蓝;孙伟军;;湘中丘陵区4种森林类型土壤有机碳和可矿化有机碳的比较[J];生态学杂志;2013年10期
5 姜培坤,徐秋芳;施肥对雷竹林土壤活性有机碳的影响[J];应用生态学报;2005年02期
6 刘继亮;李锋瑞;牛瑞雪;刘长安;刘七军;;黑河中游干旱绿洲土壤盐渍化对大型土壤动物群落的影响[J];应用生态学报;2012年06期
7 韩丽;贡璐;朱美玲;;克里雅河流域于田绿洲土壤养分与水盐因子相关关系研究[J];新疆大学学报(自然科学版);2013年03期
相关硕士学位论文 前1条
1 刘敏;和田绿洲地下水时空分布规律及其生态环境效应研究[D];西安理工大学;2007年
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