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Relationship of plant diversity with litter and soil available nitrogen in an alpine meadow under a 9-year grazing exclusion
Zou J. R.; Luo, C. Y.; Xu, X. L.; Zhao, N.; Zhao, L.; Zhao, X. Q.
Source PublicationEcological Research
2016
Volume31
Issue6
Pages841-851
KeywordFence Functional groups Grassland Light limitation Vegetation qinghai-tibet plateau livestock exclosure grassland diversity species-diversity tallgrass prairie elevated co2 productivity biodiversity carbon community
AbstractGrazing exclusion is widely used globally to restore degraded grasslands. Plant diversity has important impacts on grassland ecosystem functions, including grassland productivity and carbon storage. In this study, we selected a Kobresia meadow on the Qinghai-Tibetan Plateau to investigate how grazing exclusion affects plant diversity. Inorganic nitrogen (NH4 (+) and NO3 (-)) was also measured because its availability impacts plant growth. We found that plant diversity in the meadow was significantly lower under grazing exclusion (fenced meadow) for 9 years compared with moderate grazing. Accumulated litter was significantly higher under grazing exclusion (386.41 g m(-2)) compared with grazing (58.77 g m(-2)). Soil inorganic nitrogen at 0-5 cm depth was significantly higher under grazing exclusion (13.60 x 10(-2) g kg(-1)) than under grazing (9.40 x 10(-2) g kg(-1)). The composition of the four functional groups (grasses, sedges, legumes, and forbs) might alter in response to significant changes in the amount of litter and soil available nitrogen content under grazing exclusion compared with grazing. However, the enhanced soil available nitrogen content showed weak feedbacks on plant diversity. In conclusion, light limitation induced by increased amounts of litter may be the main factor causing decreased plant diversity in grazing-excluded meadows compared with moderately grazed meadows.
Indexed BySCI
Language英语
ISSN0912-3814
DOI10.1007/s11284-016-1394-3
Citation statistics
Cited Times:4[WOS]   [WOS Record]     [Related Records in WOS]
Document TypeSCI/SSCI论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/43465
Collection历年回溯文献
Recommended Citation
GB/T 7714
Zou J. R.,Luo, C. Y.,Xu, X. L.,et al. Relationship of plant diversity with litter and soil available nitrogen in an alpine meadow under a 9-year grazing exclusion. 2016.
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