Effects of nutrient addition on plant diversity and productivity in a Stipa baicalensis grassland in Inner Mongolia,China
Stipa baicalensis grassland is a type of meadow steppe that plays an important role in livestock husbandry in China. In recent years,unsustainable grazing,mowing,and other overuse patterns have heavily affected China's grassland ecosystems,resulting in decreased productivity and losses in biolo...
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Veröffentlicht in: | Sheng tai xue bao 2015, Vol.35 (24) |
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Format: | Artikel |
Sprache: | chi ; eng |
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Zusammenfassung: | Stipa baicalensis grassland is a type of meadow steppe that plays an important role in livestock husbandry in China. In recent years,unsustainable grazing,mowing,and other overuse patterns have heavily affected China's grassland ecosystems,resulting in decreased productivity and losses in biological diversity and ecosystem stability. The restoration and sustainable use of grassland ecosystems has become a concern in grassland ecology. Low levels of soil nitrogen( N),phosphorus( P),and potassium( K) often become important factors that limit grassland productivity,while arational application of N,P,K and medium trace element fertilizers can obviously promote the productivityand quality of grasslands.Nutrient addition can affect the structure and diversity of grassland plant communities,and studies on the response of grasslands to adding nutrients will have important theoretical and practical significance to the recovery,reconstruction,and scientific management of degraded grassland ecosystems. We studied the effects of added N,P,and K in a S. baicalensis grasslandto provide a basis for the rational use and protection of grassland resources and the restoration and reconstruction ofdegraded grassland ecosystems,as well as to lay a foundation for a more general analysis of the relationship between biodiversity and productivity.A randomized block design experiment was conducted with six blocks of eight treatments each:C( control,no nutrient addition),K( K addition only,100 kg / hm~2),P( P addition only,100 kg / hm~2),N( N addition only,100 kg / hm~2),PK( mixed P and K addition,100 kg / hm~2 of each element),NK( mixed N and K addition,100 kg /hm~2 of each element),NP( mixed N and P addition,100 kg / hm~2 of each element),and NPK( mixed N,P,and K addition,100 kg / hm~2 of each element).Forty-eight( 8 m x 8 m) plots were established with 2 m and 5 m isolation belts between the subplots and main treatment areas,respectively. In 2010,nutrients were applied twice a year with 50% of the treatment amount applied on June 15 and 50% again on July 15 during the grass-growing season.Fieldwork was completed in mid-August during the grass-growing season in 2012. To eliminate edge effects,conditions were measured only in the 6 m x6 m area in the center of each 8 m x 8 m plot. A 1 m2( 1 m x 1 m) quadrat in each 6 m x 6 m plot was used to record various biological and ecological characteristics including plant composition,plant height,percent ground cover,and vegetation density. |
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ISSN: | 1000-0933 |
DOI: | 10.5846/stxb201407171461 |