Analysis of Research Status of Grassland Aboveground Biomass Based on CiteSpace
The aboveground biomass in grassland area is easy to change under the influence of external factors,so it is of great significance to find out the research status of aboveground biomass in grassland protection.Based on CiteSpace software,this paper searched"grassland"and"aboveground biomass"in CNKI database,and found 1252 valid references.The results show that the number of papers published in the studies of"grassland"and"aboveground biomass"as keywords has gradually increased after 2005,ranging from 20 to 91 papers per year,and the number of papers has reached more than 60 after 2012.In the keyword emergence analysis,the seasonal dy-namics appeared first and were studied for the longest time(1987-2010).With the change of years,the seasonal dynamics basically changed from macro(such as climate change,vegetation restoration and fencing)to micro(group function,soil physical and chemical properties and nitrogen addition).Current research in this field focuses on biomass,natural grasslands,species diversity,Leymus chinensis,nitrogen addition,degraded meadow steppe,diversity index,grazing rate and grassland type.Through the trend of publication,keyword co-occurrence and keyword cluster analysis,the status quo of grassland aboveground biomass can be objectively and truly obtained,which provides new methods and ideas for grassland protection.Future research on aboveground biomass of grassland should pay attention to grassland degradation caused by different factors in different regions,andthe coupling effect of climate-vegetation-soil-human activities on aboveground biomass should be comprehensively considered.
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