温度和水分对吉林省主要耕作土壤有机质矿化影响的模拟研究

发布时间：2018-03-05 12:50

本文选题：温度　切入点：水分　出处：《吉林农业大学》2016年硕士论文　论文类型：学位论文

【摘要】：全球气候变化已经受到了世界各国的关注,其引发的水热条件改变,将对土壤有机质的分解造成显著影响。本试验采用室内培养方法,模拟了暖干(土壤含水量较低的情况下升高温度)和暖湿(土壤含水量较高的情况下升高温度)两种气候条件下,吉林省三种主要耕作土壤(黑土、白浆土、黑钙土)有机质含量及活性有机碳组分含量(可溶性有机碳、微生物量碳、易氧化有机碳)的变化规律,从而为适应气候变化的土壤培肥技术提供理论基础。研究结果如下:1.在模拟的暖干和暖湿两种模式下,土壤总有机碳含量的变化趋势不同。在暖干模式下,黑土和白浆土的总有机碳含量在4个设定温度条件下的变化趋势为:-10℃30℃20℃10℃;黑钙土则是-10℃30℃10℃20℃。温度与黑土有机碳呈显著负相关关系,温度与白浆土和黑钙土有机碳没有相关关系。在暖湿模式下,3种土壤总有机碳量逐渐减小,温度与黑土、白浆土和黑钙土的总有机碳之间呈极显著负相关关系。3种土壤在同一温度梯度,不同水分处理之间,低水分处理总有机碳含量大于高水分处理。2.在模拟的暖干和暖湿两种模式下,土壤有机碳矿化率表现出不同的变化规律。在暖干模式下,黑土和白浆土的有机碳矿化率在4个设定温度条件下的变化趋势为:10℃20℃30℃-10℃,黑钙土则是20℃10℃30℃-10℃。3种土壤之间有机碳矿化率表现为黑土黑钙土白浆土。在暖湿模式下,3种土壤的有机碳矿化率逐渐下降,即30℃20℃10℃-10℃。研究结果还表明,同样是在30℃培养150d的条件下,土壤含水量由7.5%-9.5%提高到15%-19%,土壤有机碳的矿化损失量即可由5.2%-10%提升到13.7%-14%。3.在模拟的暖干和暖湿两种模式下,土壤活性有机碳含量的变化趋势不同。在暖干模式下,黑土的易氧化有机碳含量在4个设定温度条件下的变化趋势为:-10℃30℃20℃10℃;白浆土和黑钙土则是-10℃30℃10℃20℃。温度与黑土和白浆土易氧化有机碳呈显著负相关关系,温度与黑钙土易氧化有机碳没有相关关系。3种土壤的微生物量碳含量在4个设定温度条件下的变化趋势为:-10℃30℃20℃10℃。温度与黑土和黑钙土微生物量碳呈显著负相关关系,温度与白浆土微生物量碳没有相关关系。3种土壤的可溶性有机碳含量在4个设定温度条件下的变化趋势为:-10℃30℃20℃10℃。温度与黑土可溶性有机碳之间呈极显著负相关关系,温度与白浆土和黑钙土可溶性有机碳之间没有相关关系。在暖湿模式下,3种土壤的活性有机碳含量逐渐减小,温度与黑土、白浆土和黑钙土的活性有机碳之间均呈极显著负相关关系。4.在模拟的暖干和暖湿两种模式下,土壤活性有机碳与总有机碳的比值均下降,但是暖湿条件下降明显。总有机碳与活性有机碳组分之间均呈极显著相关关系,活性有机碳组分可以被当作温度对土壤有机质含量影响的早期指标。
[Abstract]:Global climate change has been the world's attention, which led to the change of water and heat conditions, the decomposition of soil organic matter has a significant impact. In this experiment, the indoor culture method to simulate the warm dry (soil moisture under the condition of low temperature) and warm (soil moisture under the condition of higher. Temperature) two different climatic conditions, three kinds of main cultivated soil in Jilin province (black soil, albic soil, chernozem) the content of organic matter and active organic carbon fractions (soluble organic carbon, microbial biomass carbon, easily oxidized organic carbon) variation, thus providing a theoretical basis for soil fertilization technology to adapt to climate change. The results are as follows: 1. in the simulation of warm dry and warm wet two modes, different trends of total organic carbon content of the soil. In warm dry mode, black and white slurry soil total organic carbon content in the 4 set temperature conditions The trend is: -10 C 30 C 20 C 10 C; C 30 C -10 chernozem is 10 degrees 20 degrees Celsius. The temperature was significantly and negatively correlated with soil organic carbon, temperature had no correlation with soil organic carbon and chernozem white pulp. In wet mode, 3 kinds of soil total organic carbon decreased gradually the temperature, and between the total organic carbon black, Albic Soil and chernozem was negatively related to.3 in the same kind of soil temperature gradient between different water treatments, low water treatment total organic carbon content is higher than that of the high water treatment of.2. in the simulation of warm dry and warm wet two modes, soil organic carbon mineralization the rate showed a different variation. In warm dry mode, the change trend of organic carbon mineralization in black and white slurry soil at the rate of 4 set temperature: 10 degrees centigrade 20 degrees 30 DEG -10 DEG, chernozem organic carbon mineralization is between 20 DEG C and 10 C 30 DEG -10 DEG.3 for the rate of soil show Black black soil soil. Calcium in warm mode, 3 kinds of soil organic carbon mineralization rate decreased gradually, which is 30 C 20 C 10 -10 OC. The results also show that the same is the culture condition of 150D at 30 DEG C, soil moisture increased from 7.5%-9.5% to 15%-19%, the loss of soil organic mineralization can be carbon increased from 5.2%-10% to 13.7%-14%.3. in the simulation of the warm dry and warm wet two modes, different trends of soil active organic carbon content. In warm dry mode, change trend in the 4 set temperature under the condition of the soil easily oxidized organic carbon content is: -10 C 30 C 20 C 10 C; white PLANOSOL and chernozem is -10 C 30 C 10 C 20 C. And the temperature of black soil and albic soil is negatively related to the oxidation of organic carbon, temperature and microbial biomass carbon content changes were not related to.3 oxidation of organic carbon in soils in 4 set temperature conditions Trend: -10 C 30 C 20 C 10 C. Temperature showed a significant negative correlation with soil microbial biomass carbon black, trends in the 4 set temperature conditions of soluble organic carbon in Albic soil temperature and microorganism biomass carbon not related to soil.3 is: -10 C 30 C 20 C 10 C. Between temperature and soil soluble organic carbon was negatively related, no correlation between temperature and soil soluble organic carbon and chernozem. In wet mode, 3 kinds of soil active organic carbon content decreases, temperature and soil active organic carbon, between Albic Soil and black soil were there was a significant negative correlation between.4. in the simulation of warm dry and warm wet two modes, the ratio of active soil organic carbon and total organic carbon decreased, but warm conditions decreased significantly. The total organic carbon and labile organic carbon fractions showed extremely significant correlation between The active organic carbon component can be used as an early indicator of the effect of temperature on the content of soil organic matter.

【学位授予单位】：吉林农业大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：S153.6

【参考文献】