doi:

DOI: 10.3724/SP.J.1145.2013.00905

Chinese Journal of Appplied Environmental Biology (应用与环境生物学报) 2013/19:6 PP.905-913

Effects of Fertilization and Grazing Exclosure on Vegetation Recovery in a Degraded Alpine Meadow on the Tibetan Plateau


Abstract:
Both fertilization and grazing exclosure are effective management measures for recovery of degraded grasslands. To better understand the effects of both measures and their interaction on restoration of degraded alpine grasslands, a longterm experiment of exclosure and addition of nitrogen (50 kg N hm-2 a-1, LN; 100 kg N hm-2 a-1, HN) combined with phosphorus ((50 kg N + 50 kg P) hm-2 a-1, LN + P; (100 kg N + 50 kg P) hm-2 a-1, HN + P) was carried out in a degraded Kobresia pygeama alpine meadow on the Tibetan Plateau since 2008. The results showed that nitrogen (N) addition did not affect plant community coverage, while in grazing plots LN + P and HN + P treatments signi fi cantly increased plant community coverage by 86% and 63%, respectively. Moreover, in grazing exclosure plots LN + P and HN + P treatments signi fi cantly increased 107% and 248% of plant community coverage respectively, compared with grazing plots under the same fertilization levels. N additionalone contributed to enhancing importance values (IV) of grass, and this effect was specifically improved by exclosure. However, sedge and Potentilla were much more responsive to combination of N and P addition. N addition alone under free grazing did not affect aboveground biomass for grass, sedge or herbs of Potentilla, while LN + P treatment significantly enhanced community aboveground biomass by 137%. Under exclosure conditions, N addition did not signi fi cantly change the aboveground biomass of sedge, but increased the aboveground biomass of grass by 8.4 times. However, N combined with P addition in fencing plots signi fi cantly promoted aboveground biomass of grass, sedge and Potentilla herbs. For example, LN + P and HN + P treatments enhanced the aboveground biomass of herbs by 98% and 86%, respectively. Our results suggested that though N addition alone could not improve the condition of degraded alpine meadow, N combined with P fertilization and/ or exclosure will contribute greatly to the restoration of degraded alpine meadow. Fig 3, Tab 4, Ref 54

Key words:fertilization,grazing exclosure,vegetation restoration,degraded alpine meadow,Tibetan Plateau

ReleaseDate:2015-04-15 08:42:18



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