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Additional carbon sequestration benefits of grassland diversity restoration

De Deyn, G.B. and Shiel, R.S. and Ostle, N.J. and McNamara, N.P. and Oakley, S. and Young, I. and Freeman, C. and Fenner, N. and Quirk, H. and Bardgett, R.D. (2011) Additional carbon sequestration benefits of grassland diversity restoration. Journal of Applied Ecology, 48, 600-608. ISSN 0021-8901.

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1. In Europe, grassland agriculture is one of the dominant land uses. A major aim of European agri-environment policy is the management of grassland for botanical diversity conservation and restoration, together with the delivery of ecosystem services including soil carbon (C) sequestration. 2. To test whether management for biodiversity restoration has additional benefits for soil C sequestration, we investigated C and nitrogen (N) accumulation rates in soil and C and N pools in vegetation in a long-term field experiment (16 years) in which fertilizer application and plant seeding were manipulated. In addition, the abundance of the legume Trifolium pratense was manipulated for the last 2 years. To unravel the mechanisms underlying changes in soil C and N pools, we also tested for effects of diversity restoration management on soil structure, ecosystem respiration and soil enzyme activities. 3. We show that the long-term biodiversity restoration practices increased soil C and N storage especially when these treatments were combined with the recent promotion of the legume Trifolium pratense, sequestering 317 g C and 35 g N m−2 year−1 in the most successful management treatment. These high rates of C and N accumulation were associated with reduced ecosystem respiration, increased soil organic matter content and improved soil structure. Cessation of fertilizer use, however, reduced the amount of C and N contained in vegetation. 4. Synthesis and applications. Our findings show that long-term diversity restoration practices can yield significant benefits for soil C storage when they are combined with increased abundance of a single, sub-ordinate legume species. Moreover, we show that these management practices deliver additional ecosystem benefits such as N storage in soil and improved soil structure.

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:8791
Deposited On:11 Jan 2011 01:00
Last Modified:24 Apr 2012 16:42

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