Nitrogen Availability in Urban and Rural Gradient Forest Soils
Urbanization is an inevitable trend of human social and economic development. However, the development of urbanization also brings tremendous pressure and challenges to the construction of urban ecological environment. Urban forests are frequently disturbed and destroyed, leading to a decline in the ecological functions of forests. Due to the intensification of human activities, urbanization has changed the state of water and heat distribution in cities, and caused ecological factors such as temperature and humidity to form correspondingly increasing or decreasing gradients in the urban-suburban-village ecological interface, affecting the nitrogen in urban forest soils. The mineralization process has changed the nitrogen cycling and nutrient balance in urban forest ecosystems. Nutrient cycling is a key ecological process in urban forest ecosystems. Soil available nitrogen affects plant growth, development and ecology in urban forests. The function of the system service function. Therefore, it is of great significance to study the impact of urbanization on nitrogen transformation in forest soils. The study of nitrogen availability is not only important for revealing the nature of forest ecosystem functions and nitrogen biogeochemical cycling processes, but also an important basis for evaluating forest ecosystem stability and ecosystem services. Through the monthly monitoring of available nitrogen in forest soil by the soil nutrient fastness tester, the dynamic research of ammonium nitrogen, nitrate nitrogen and mineral nitrogen in the urban and rural gradient ecological interface was carried out to explore the available nitrogen content and morphological composition of the urban forest ecosystem. Its transformation laws enhance the understanding of the impact of urbanization on natural ecosystems and provide scientific basis for scientific management and management of urban forests. Soil available nitrogen mainly comes from soil nitrogen mineralization and nitrification, while soil nitrogen mineralization and nitrification are usually controlled by climatic conditions (mainly temperature, humidity), litter chemical composition, soil pH and other factors. This study found that the contents of ammonium nitrogen, nitrate nitrogen, and mineral nitrogen in forest soils at different ecological interfaces in urban and rural gradients are significantly different. The average annual ammonium nitrogen content at different ecological interfaces is expressed as urban> suburban = rural; different ecological interfaces. The average value of nitrate nitrogen in the year is urban> rural> rural; the mean annual average mineral nitrogen in different ecological interfaces is urban> suburban> rural, and the overall performance is closer to the urban area, the higher the effective nitrogen is. This is due to the fact that urbanization has changed the water and heat conditions of urban forests, making ecological factors such as temperature and humidity form correspondingly increasing or decreasing gradients in the urban-suburban-village ecological interface, thus changing the nitrogen of urban forest ecosystems. The nutrient balance and nutrient balance affect the process of soil nitrogen mineralization. It can be seen that the urbanization process will exacerbate the process of nitrogen mineralization in forest soils, thereby increasing the soil's available nitrogen content, especially the nitrate nitrogen content. Magnetic locks, also known as electromagnetic locks, are mostly used for iron doors and wooden doors. They are a kind of electric locks that are frequently used in access control systems. They are widely used in schools, enterprises, and units, and provide protection for people's safety.
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