Effects of Utilization Patterns on the Spectral Characteristics of Soil Dissolved Organic Matter in Alpine Meadow of Qinghai Province北大核心CSCD

Soil dissolved organic matter is the most active component of the global carbon cycle. It plays an important role in the terrestrial ecosystem. In order to explore the effects of utilization patterns to the content and structural characteristics of soil dissolved organic matter of alpine meadow in Qinghai province,the contents of soil dissolved organic carbon,ultraviolet-visible spectroscopy,SUVA254,SUVA280,f450/500,HIX and synchronous fluorescence spectroscopy in 0 to 10 cm and 10 to 20 cm soil layers under 4 different utilization patterns,including secondary seabuckthorn forest,returning farmland to forest,farmland and natural pasture,were measured. The results showed that the variation of soil dissolved organic carbon and organic carbon contents in 0 to 10 cm layers performed a similar pattern,i.e. natural pasture > secondary seabuckthorn forest > returning farmland to forest > farmland. However,soil of returning farmland to forest and secondary seabuckthorn forest in 10 to 20 cm layers had higher dissolved organic carbon and organic carbon contents. The contents of organic carbon and dissolved organic carbon decreased with the depth of the soil layer. The same as the complexity of soil dissolved organic matter. The soil dissolved organic matter in the soil of natural grazing land had a higher degree of aromatization and humification,and had more polycyclic aromatic hydrocarbons. The results indicated that the structure of soil dissolved organic matter of natural pasture was more complicated and more stable. It could give a positive effect on maintaining the balance and ecological stability of the carbon pool in the alpine region of Qinghai province. The structure of soil dissolved organic matter in 0 to 10 cm layers was more complicated. © 2020 Ｊｏｕｒｎａｌ ｏｆ Ｒｅｆｒｉｇｅｒａｔｉｏｎ. All rights reserved.