Nitrogen yield advantage from grass–legume mixtures is robust over a wide range of legume proportions and environmental conditions
Fecha de publicación2015
Finn, John A.
MetadatosMostrar el registro completo del ítem
Current challenges to global food security require sustainable intensification of agriculture through initiatives that include more efficient use of nitrogen (N), increased protein self-sufficiency through homegrown crops, and reduced N losses to the environment. Such challenges were addressed in a
continental-scale field experiment conducted over 3 years, in which the amount of total nitrogen yield (Ntot) and the gain of N yield in mixtures as compared to grass monocultures (Ngainmix) was quantified from four-species grass–legume stands with greatly varying legume proportions. Stands consisted of monocultures and mixtures of two N2-fixing legumes and two nonfixing grasses. The amount of Ntot of mixtures was significantly greater (P ≤ 0.05) than that of grass monocultures at the majority of evaluated sites in all 3 years. Ntot and thus Ngainmix increased with increasing legume proportion up to one-third of legumes. With higher legume percentages, Ntot and Ngainmix did not continue to increase. Thus, across sites and years, mixtures with one-third proportion of legumes attained ~95% of the maximum Ntot acquired by any stand and had 57% higher Ntot than grass monocultures. Realized legume proportion in stands and the relative N gain in mixture (Ngainmix/Ntot in mixture) were most severely impaired by minimum site temperature (R = 0.70, P = 0.003 for legume proportion; R = 0.64, P = 0.010 for Ngainmix/Ntot in mixture). Nevertheless, the relative N gain in mixture was not correlated to site productivity (P = 0.500), suggesting that, within climatic restrictions, balanced grass–legume mixtures can benefit from comparable relative gains in N yield across largely differing productivity levels. We conclude that the use of grass–legume mixtures can substantially contribute to resource-efficient agricultural grassland systems over a wide range of productivity levels, implying important savings in N fertilizers and thus greenhouse gas emissions and a considerable potential for climate change mitigation.
Es parte deGlobal Change Biology, 2015, vol. 21, núm. 6, p. 2424-2438
Showing items related by title, author, creator and subject.
Ecosystem function enhanced by combining four functional types of plant species in intensively managed grassland mixtures: a 3-year continental-scale field experiment Finn, John A.; Kirwan, Laura; Connolly, John; Sebastià, Ma. T.; Helgadottir, Aslaug; Baadshaug, Ole H.; Bélanger, Gilles; Black, Alistair; Brophy, Caroline; Collins, Rosemary P.; Cop, Jure; Dalmannsdóttir, S.; Delgado, Ignacio; Elgersma, Anjo; Fothergill, Michael; Frankow-Lindberg, Bodil E.; Ghesquiere, An; Golinska, Barbara; Golinski, Piotr; Grieu, Philippe; Gustavsson, Anne-Maj; Höglind, Mats; Huguenin-Elie, Olivier; Jørgensen, Marit; Kadziuliene, Zydre; Kurki, Päivi; Llurba, Rosa; Lunnan, Tor; Porqueddu, Claudio; Suter, Matthias; Thumm, Ulrich; Lüscher, Andreas (Wiley online library, 2013)A coordinated continental-scale field experiment across 31 sites was used to compare the biomass yield of monocultures and four species mixtures associated with intensively managed agricultural grassland systems. To increase ...
Connolly, John; Bell, Thomas; Brophy, Caroline; Carnus, Timothee; Finn, John A.; Kirwan, Laura; Lüscher, Andreas; Sebastià, Ma. T.; Weigelt, Alexandra (European Grassland Federation, 2010)The delivery of essential ecosystem functions (primary productivity, maintenance of soil fertility, resistance to weed invasion etc.) may be compromised by global declines in biodiversity. There is still controversy about ...
Connolly, John; Bell, Thomas; Bolger, Thomas; Brophy, Caroline; Carnus, Timothee; Finn, John A.; Kirwan, Laura; Isbell, Forest; Levine, Jonathan; Lüscher, Andreas; Picasso, Valentin; Roscher, Christiane; Sebastià, Ma. T.; Suter, Matthias; Weigelt, Alexandra (Wiley, 2013)The development of models of the relationship between biodiversity and ecosystem function (BEF) has advanced rapidly over the last 20 years, incorporating insights gained through extensive experimental work. We propose ...