Effects Of Moisture And Nutrient On Vegetation Recovery And Carbon Storage Of Degraded Desert Steppe

The desert steppe is the second largest zonal grassland types in Inner Mongolia. Climate change, overgrazing and so on result in widespread degradation and carbon sequestration capacity continued to decline of Inner Mongolia desert steppe. Vegetation recovery is not only the effective measure to improve grass yields and carrying capacity, and the ecological environment of degraded desert steppe, but also the only way to enhance the carbon sequestration capacity of degraded desert steppe. To this end, this study has implemented watering and fertilization treatments in degraded desert steppe in SiZiWang banner of Inner Mongolia in order to explore the effects of moisture and nutrient when they were made better on vegetation recovery and carbon storage of degraded desert steppe. The main conclusions are as follows:(1) Watering and fertilization treatments all improved the average height and dry weight of grass group. N+P treatment and N+P+K treatment improved the community coverage, W treatment and N treatment reduced the community coverage. W treatment、 N treatment and N+P treatment reduced the total number of vegetation, N+P+K treatment increased the total number of vegetation.(2) Watering and fertilization treatments all significantly improved aboveground nitrogen content, every treatment the nitrogen content of aboveground from high to low in turn is:N+P treatment N+P+K treatment、N treatment、W treatment. W treatment and N+P treatment improved grass group aboveground phosphorus content, N treatment and N+P+K treatment reduced grass group aboveground phosphorus content. Grass group aboveground potassium content was no significant difference among the treatments.(3) Watering and fertilization treatments increased the total phosphorus content of soil, the total nitrogen and potassium content were relatively stable. W treatment reduced the soil available nitrogen content, fertilization treatment improved the soil available nitrogen content. W treatment and N treatment reduced the soil available phosphorus content, N+P treatment and N+P+K treatment improved the available phosphorus content. Watering and fertilization treatments had little affect on soil available potassium content、 organic content and bulk density. W treatment improved the soil alkaline, fertilization treatment reduced the soil alkaline.(4) N+P+K treatment improved the microbial carbon content of soil, while other treatments had little affect on soil microbial carbon content. (5) W treatment、N+P treatment and N+P+K treatment improved the total carbon storage of vegetation-soil system, the system total carbon storage slightly reduced in N treatment.