Effects of artificial planting on the carbon exchange and its components in the degraded grassland in the Muli Mining Area of Qinghai
Vegetation restoration plays an important role in increasing soil organic carbon content and restoring ecosystems and carbon balance in the high-altitude mining area.Muli Mining Area in Qinghai is taken as an example to set up four types of sample plots,including noreconstructed soil artificial grassland(NRS),reconstructed soil artificial grassl and(RS),alpine meadow(AM)and alpine swamp meadow(ASM).The impact of artificial restoration measures on soil organic carbon in the degraded grassland in the mining area is evaluated by analyzing the vegetation community struc-ture,soil physicochemical properties and other indicators.The results are as follows:The soil organic carbon content of ASM is the highest,at 337.21 g/kg,and there is no significant difference between RS and ASM;RS has high vegetation coverage,height,aboveground biomass,community respiration rate,community photosynthetic rate and soil respiration rate.The net ecosy stem carbon exchange rate between RS and ASM is significantly lower than that between NRS and AM(P＜0.05),indica-ting that RS and ASM have strong carbon sequestration capabilities and both act as carbon sinks;the TN content of ASM is the highest,at 70.09 g/kg,and there is no significant difference between RS and ASM;the TP content of RS is the highest,at 9.86 g/kg,significantly different from NRS(P＜0.05).The soil of RS and NRS is alkaline,while that of AM and ASM is acidic.The physical and chemical properties of soil,such as moisture content,TN,TP,etc.,are significantly positively correlated with SOC content;vegetation coverage,soil moisture content,underground biomass,root organic carbon content,soil organic carbon content,community photosynthetic rate and soil respiration rate are all negative influencing factors of NEE.In summary,artificial grassland for soil reconstruction can increase soil organic carbon content.The carbon sequestration and carbon absorption capacity of degraded grassland in the Muli Mining Area of Qinghai is enhanced with the improvement of aboveground biomass,soil moisture content,and nitrogen and phosphorus content.
Qinghai-Xizang Plateauartificial grasslandmining area soilcarbon sink dynamicsreconstructing soil
NETL
NSTL
万方数据
