Theme 1: Grassland Ecology
Description
Due to the intensification of human activities, global warming and increased atmospheric nitrogen deposition have become important driving factors of global change. In order to understand the effects of long-term warming and nitrogen application on soil physical and chemical properties and enzyme activities, the effects of warming and nitrogen application on grassland soil enzyme activities were measured. The aim was to reveal the response of enzyme activity in an Inner Mongolian desert steppe to long-term warming and nitrogen addition. The results were as follows. In 2018, nitrogen fertilization significantly increased soil dehydrogenase activity, and soil depth significantly affected soil urease, β-Glucosidase, phosphatase and dehydrogenase activities. In 2019, the four soil enzyme activities only showed significant differences at different soil depths, while the effects of warming, nitrogen addition and their interactions on soil enzyme activities were not significant. In general, the enzyme activities of desert grassland soil were not affected by warming, while nitrogen addition had a greater impact on the soil enzyme activities. However, large difference in soil moisture between the two years of the experiment was also a key factor leading to large fluctuations between the two years, which indicated that in the semi-arid desert grassland, the change of soil nutrient characteristics is also affected by water content.
Included in
Agricultural Science Commons, Agronomy and Crop Sciences Commons, Plant Biology Commons, Plant Pathology Commons, Soil Science Commons, Weed Science Commons
Effects of Warming and Nitrogen Addition on Soil Enzyme Activities
Due to the intensification of human activities, global warming and increased atmospheric nitrogen deposition have become important driving factors of global change. In order to understand the effects of long-term warming and nitrogen application on soil physical and chemical properties and enzyme activities, the effects of warming and nitrogen application on grassland soil enzyme activities were measured. The aim was to reveal the response of enzyme activity in an Inner Mongolian desert steppe to long-term warming and nitrogen addition. The results were as follows. In 2018, nitrogen fertilization significantly increased soil dehydrogenase activity, and soil depth significantly affected soil urease, β-Glucosidase, phosphatase and dehydrogenase activities. In 2019, the four soil enzyme activities only showed significant differences at different soil depths, while the effects of warming, nitrogen addition and their interactions on soil enzyme activities were not significant. In general, the enzyme activities of desert grassland soil were not affected by warming, while nitrogen addition had a greater impact on the soil enzyme activities. However, large difference in soil moisture between the two years of the experiment was also a key factor leading to large fluctuations between the two years, which indicated that in the semi-arid desert grassland, the change of soil nutrient characteristics is also affected by water content.
