Effect of seed fertilizer clays regeneration on community composition and biomass of degraded alpine grassland in Sanjiangyuan
[Objective]In recent years,climate warming and overgrazing have led to the degradation of the alpine grassland in Sanjiangyuan,resulting in the deterioration of ecological environment in the source area,and a decline in the grassland vegetation diversity and biomass.Reseeding is a commonly used and effective method for restoring de-graded grasslands.Some studies have shown that seed fertilizer clays are suitable for near-natural reseeding restora-tion of alpine grasslands.To provide a scientific basis for the restoration and sustainable utilization of degraded alpine grassland,this study explored the effects of seed fertilizer clay on the plant composition and biomass of alpine grass-lands in the source area of Sanjiangyuan[Method]This study focused on the degraded alpine grassland in Sanji-angyuan as the research object,and used seed-fertilizer clay with different proportions to reseed it.[Result]The re-sults showed that the addition of five seed fertilizer clays increased the important values of the dominant grass species,the number of species,and vegetation coverage.It also increased the Shannon-wiener diversity index of the commu-nities except for the C treatment,which decreased the Pielou evenness index.It was found that the addition of 15 g grass seeds,8.5 g compound fertilizer and 71.5 g attapulgite clay promoted the growth of leguminous plants,increas-ing their biomass by 8.35 g/m2.Furthermore,the addition of 15 g grass seeds,15 g compound fertilizer,and 65 g at-tapulgite clay fertilizers significantly increased the aboveground biomass of grasses and sedge plants while reduced the aboveground biomass of leguminous plants.The biomass of gramineous plants and sedge plants increased by 3.6 g/m2 and 8.95 g/m2,respectively,indicating that the seed fertilizer clay can better promote the growth of gramineous and sedge plants.[Conclusion]In conclusion,reseeding of seed fertilizer clays is important for restoring the vegeta-tion diversity of degraded alpine grasslands and increasing the forage yield.
alpine grasslandseed fertilizer claysimportant valuebiomassdiversity index
万方数据
维普
