Characteristics And Influencing Factors Of Soil Organic Carbon Composition And Stability In Yellow River Irrigation Area

Soil organic carbon(SOC)is one of the most basic properties of Soil,and is also one of the important indexes to measure Soil fertility,which is closely related to agricultural production.Increasing soil carbon sequestration can reduce the concentration of carbon dioxide and reduce the global warming trend.Therefore,the study on the change of soil organic carbon has become one of the hot spots in the world.In contrast,stable organic carbon is more conducive to slowing the increase of CO2 concentration in the atmosphere,which is a more effective component of soil carbon sequestration.According to soil organic carbon density grouping method divided into light group and the restructuring of organic carbon,among them,the light group of organic carbon on behalf of the relatively active carbon component,restructuring carbon composition of the organic carbon is relatively stable.The change of soil organic carbon composition reflects the stability and evolution direction of soil carbon reservoir.Soil aggregates are the basic structure of soil,which is one of the basic structures of soil.The size and stability of aggregates in soil can affect the stability of soil carbon storage.Soil mass agglomeration has the priority to protect the organic matter and improve its stability,which has obvious effect on soil carbon sequestration.The effect and stability of soil organic carbon and agglomeration are not clear.In this study,for example,in the irrigation area of Ningxia were measured in 2009 and 2015,collection of soil organic carbon in the samples and light group,the reorganization of the organic carbon content,analysis of aggregate composition and characteristics of organic carbon content and soil organic carbon content compared to 2009-2009 light group,restructuring and soil organic carbon content changes in the characteristics,reveal the stability of soil carbon library law;The influencing factors of soil organic carbon components and aggregates in the driving irrigated areas were revealed,and their influence on soil carbon storage was analyzed.The results can provide scientific basis for the stability of soil carbon storage and the improvement of carbon sequestration potential.The main results are as follows:(1)yellow irrigation farming can increase soil organic carbon content,and soil organic carbon content increases with the increase of irrigation time.On the whole,the content of organic carbon in different types of soil is the new soil of BBB,>,BBB,and >,which is the largest increase after irrigation.Compared with the soil organic carbon in 2009,2015 surface soil organic carbon content is changed,the surface of organic carbon content showed with the increase of irrigation farming the rule of response is sensitive,the surface layer increases obviously.(2)Reorganization of soil organic carbon content in the irrigation area of(2)were significantly higher than the group of organic carbon,similar to soil organic carbon content,the surface light group,the reorganization of the content of organic carbon content is higher than the surface,2015 young group,restructuring of organic carbon content have declined from 2009,and significant difference(P < 0.05),the reason may be related to the quantity of soil,the specific reason remains to be further research.(3)the irrigation farming soil aggregate and aggregate more uniform distribution of organic carbon,enhanced stability,with the increase of irrigation farming,organic carbon content is increased,soil aggregate with the decrease of the aggregate graded at the same time,the aggregate of organic carbon in a "V" type distribution;> 0.053 mm aggregate between organic carbon and total organic carbon strong correlation,compared with the irrigation soil,contrast correlation between soil organic carbon and total organic carbon,can be 2 ~ 0.053 mm aggregate as the characteristics of the organic carbon fixed aggregate in the irrigation area.(4)the irrigation time,soil type and irrigation is driven in the irrigation area and aggregate organic carbon of soil organic carbon component factor,irrigation farming,the longer part of soil organic carbon and aggregate organic carbon content,the more different soil types,soil organic carbon composition and aggregate organic carbon content are also different,under normal circumstances,the irrigation YuTu most organic carbon content;The effect of irrigation method on soil surface organic carbon was more obvious,and the organic carbon content of soil organic carbon and aggregates was more.