克里雅河流域于田綠洲土壤碳庫及轉化特征
發(fā)布時間：2018-09-12 16:02
【摘要】：土壤碳庫是陸地生態(tài)系統(tǒng)中最大且周轉時間最慢的碳庫,它是由有機碳庫和無機碳庫兩大部分組成,在全球碳循環(huán)中起著關鍵作用。當前,環(huán)境因子和人類活動交互作用深刻影響著碳庫的遷移和轉化,并與全球變化存在耦合和反饋機制。土壤碳庫及轉化特征研究已成為土壤碳循環(huán)與全球變化研究的熱點領域。本論文以克里雅河流域于田綠洲為典型研究區(qū),在研究土壤碳庫特征的基礎上,利用相關分析和冗余分析深入探討土壤碳含量與影響因子之間的相關關系,并通過構建土壤有機碳礦化模型來揭示土壤碳庫轉化特征,以期全面揭示干旱區(qū)綠洲土壤碳庫特征,為研究陸地碳循環(huán)機制和全球碳收支平衡提供科學依據(jù)。主要得出以下研究結論:1.獲得綠洲土壤碳庫分布特征。結果表明不同土壤類型的有機碳、活性有機碳含量總體分布規(guī)律均為灌漠土鹽土棕漠土風沙土,無機碳含量總體分布規(guī)律為棕漠土鹽土灌漠土風沙土,活性無機碳含量總體分布規(guī)律是鹽土灌漠土風沙土棕漠土。不同土層的有機碳、無機碳含量總體變化規(guī)律均為0-10cm10-30cm30-60cm,活性有機碳含量總體變化規(guī)律為表層0-10cm含量最大,其他兩土層含量相近,活性無機碳含量總體變化規(guī)律為10-30cm30-600-10cm。2.獲得綠洲內(nèi)不同土壤類型表層土的理化因子及酶活性變化規(guī)律。結果可知土壤水分含量灌漠土最高,地下水埋深灌漠土最淺,風沙土最深,pH值及土壤全鹽含量鹽土最高;土壤全氮、有效磷含量均為灌漠土最高,速效K則有所不同,表現(xiàn)為鹽土最高、灌漠土最低;土壤酶活性均為灌漠土最高。3.結合相關分析及冗余分析,獲得土壤碳含量與影響因子的相關關系。影響因子中土壤水分、容重是影響有機碳和無機碳含量的極顯著因子;過氧化氫酶、全氮、地下水埋深對有機碳與無機碳含量的影響達到顯著水平;有效磷、蔗糖酶和速效鉀對有機碳與無機碳含量的整體影響沒有達到顯著水平;pH、全鹽對二者的影響較小。影響因子對有機碳、無機碳含量影響的重要性由大到小依次為:容重土壤水分過氧化氫酶全氮地下水埋深有效磷蔗糖酶速效鉀pH全鹽。4.構建土壤有機碳礦化模型。通過模型可知不同土壤類型礦化規(guī)律為:灌漠土、鹽土隨著土層深度的增加礦化速率呈現(xiàn)逐漸降低的變化趨勢,棕漠土的礦化規(guī)律為10-30cm0-10cm30-60cm,風沙土礦化特征與其他三類土壤均不同,礦化速率規(guī)律為30-60cm0-10cm10-30cm。不同土層礦化規(guī)律為:在0-10cm土層礦化速率為:風沙土灌漠土棕漠土鹽土,10-30cm土層礦化速率為:鹽土灌漠土棕漠土風沙土,在30-60cm土層礦化速率為風沙土鹽土灌漠土棕漠土。
[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.
【學位授予單位】：新疆大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：S153.6
本文編號：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.
【學位授予單位】：新疆大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：S153.6
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