Pasture production under densely planted young willow and poplar in a silvopastoral system

Hussain, Z.; Kemp, Peter; Horne, D. J.; Jaya, I Komang Damar

doi:10.1007/s10457-008-9195-5

Cited by 14 publications

(14 citation statements)

References 22 publications

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“…The average yield of the experimental pasture at maximum development was 406 g dw irT 2 , equivalent to 4060 kg dry matter ha -1 . This value is within the range of 500-5400 kg dry matter ha -1 year -1 reported under natural conditions (Olea and SanMiguel-Ayanz, 2006;Vazquez-De-Aldana et al, 2008;Hussain et al, 2009). Likewise, NEE and dark respiration rates were similar to values measured in natural annual pastures in Portugal (Hussain Ozone clearly affected the annual pasture community causing visible foliar injury, accelerating plant senescence and reducing green and total aboveground biomass.…”

Section: Discussionsupporting

confidence: 79%

“…The background soil N content of the soil (10 mg Nmin kg -1 i-e. 33 kg N m j n ha -1 ) seemed to be enough to cover pasture N nutritional demand, explaining the lack of response to low N additions. Natural annual pastures usually grow in low fertility soils (Vazquez-De-Aldana et al, 2008) and a soil N content representing one tenth of the background soil N content of our experiment has been reported in natural annual pastures in Portugal (Hussain et al, 2009). Other nutrients, such as phosphorus, could be limiting plant development in this ecosystem type.…”

Section: Discussionsupporting

confidence: 46%

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Current ozone levels threaten gross primary production and yield of Mediterranean annual pastures and nitrogen modulates the response

Calvete-Sogo

Elvira

Sanz

et al. 2014

Atmospheric Environment

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Pastures are among the most important ecosystems in Europe considering their biodiversity and distribution area. However, their response to increasing tropospheric ozone (O3) and nitrogen (N) deposition, two of the main drivers of global change, is still uncertain. A new Open-Top Chamber (OTC) experiment was performed in central Spain, aiming to study annual pasture response to O3 and N in close to natural growing conditions. A mixture of six species of three representative families was sowed in the field. Plants were exposed for 40 days to four O3 treatments: filtered air, non-filtered air (NFA) reproducing ambient levels and NFA supplemented with 20 and 40 nl I -1 O3. Three N treatments were considered to reach the N integrated doses of "background", +20 or +40 kg N ha -1 . Ozone significantly reduced green and total aboveground biomass (maximum reduction 25%) and increased the senescent biomass (maximum increase 40%). Accordingly, O3 decreased community Gross Primary Production due to both a global reduction of ecosystem CO2 exchange and an increase of ecosystem respiration. Nitrogen could partially counterbalance O3 effects on aboveground biomass when the levels of O3 were moderate, but at the same time O3 exposure reduced the fertilization effect of higher N availability. Therefore, O3 must be considered as a stress factor for annual pastures in the Mediterranean areas.

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Section: Discussionsupporting

confidence: 79%

Section: Discussionsupporting

confidence: 46%

Current ozone levels threaten gross primary production and yield of Mediterranean annual pastures and nitrogen modulates the response

Calvete-Sogo

Elvira

Sanz

et al. 2014

Atmospheric Environment

View full text Add to dashboard Cite

show abstract

“…The average yield of the experimental pasture at maximum development was 406 g dw m -2 , equivalent to 4060 kg dry matter ha -1 . This value is within the range of 500-5400 kg dry matter ha -1 year -1 reported under natural conditions (Olea and SanMiguel-Ayanz, 2006;Vázquez-De-Aldana et al, 2008;Hussain et al, 2009). …”

Section: Discussionsupporting

confidence: 78%

“…Likewise, NEE and dark respiration rates were similar to values measured in natural annual pastures in Portugal (Hussain et al, 2009). Therefore, our experimental annual community can be considered representative of natural annual pastures.…”

Section: Discussionsupporting

confidence: 77%

“…33 kg Nmin ha -1 ) seemed to be enough to cover pasture N nutritional demand, explaining the lack of response to low N additions. Natural annual pastures usually grow in low fertility soils (Vázquez-De-Aldana et al, 2008) and a soil N content representing one tenth of the background soil N content of our experiment has been reported in natural annual pastures in Portugal (Hussain et al, 2009). Other nutrients, such as phosphorus, could be limiting plant development in this ecosystem type.…”

Section: Discussionsupporting

confidence: 53%

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Productivity and quality of dehesa pastures in relation to global change : increasing tropospheric ozone and nitrogen deposition

Sogo¹

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Resumen X que a los niveles ambientales del contaminante. Por ello, se recomienda que los análisis de riesgo de O3 para pastos anuales se basen siempre en niveles críticos basados en flujos (POD). El uso de modelos de crecimiento del pasto, ligados a la aproximación multi-específica del DO3SE para el cálculo de la absorción de O3 a escala de dosel, son mas precisos para refinar los análisis de riesgo que los basados en índices de concentración como el AOT40. biomass species composition and gas exchange response parameters were measured, as well as forage quality parameters that are usually less studied. Based on the quantification of the effects, and the modelling exercises for calculating O3 uptake inside the plants through a new multi-species approach of the Deposition of Ozone and Stomatal Exchange (DO3SE) model, new O3 exposure-and doseresponse relationships were derived and threshold limits (critical levels) for this pollutant were proposed for the protection of annual communities. The canopy approach is a novel consideration which brings forward the current individual species approach. Moreover, three years of field data on growth, phenology and species composition from a natural Dehesa pasture were collected and analyzed. ABSTRACTFinally, based on all the information available, a 3-years O3-risk assessment study was performed for a natural Dehesa pasture. The pasture yield at canopy level showed similar response patterns to the treatments for the two growing seasons analysed: O3 caused a yield loss that was partially mitigated by N-fertilization; simultaneously, O3 reduced the fertilization effect of N. Accordingly, O3 decreased the community Gross Primary Production Abstract XV due to both a global reduction of ecosystem CO2 exchange and an increase of ecosystem respiration. The results at the species level showed heterogeneous responses to both factors, O3 and N. Legumes did not react to N but were very sensitive to O3:Trifolium species responded negatively, while Ornithopus responded positively, taking advantage of the greater sensitivity of clovers to O3. Thus, the legumelegume competition plays an important role in the system under polluted environments. The grasses and the herb were more O3-tolerant than the Trifolium but more responsive to N, especially the grasses. The significant interactions between factors followed the general pattern described at canopy scale, a loss of effectiveness of N in O3-polluted atmospheres and an ability of the fertilizer to counterbalance the damage induced by O3; but both effects were dependent on the species, and on the O3 and N levels. The direction of the interaction can reverse if N is too high at the highest O3 levels, as it was found for T. striatum roots. In this situation, the fertilizer increased the O3-induced root reduction. Both factors might affect the competitive relationships among species through their heterogeneous responses to O3 and N, affecting the structure and composition of Mediterranean annual pastures.Ozone and N-inputs also affected the car...

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Genetic potential of wild birdsfoot trefoil (Lotus corniculatus L.) seeds collected from different geographical locations regarding to nutrient composition and nutritive value

2015

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Pasture production under densely planted young willow and poplar in a silvopastoral system

Cited by 14 publications

References 22 publications

Current ozone levels threaten gross primary production and yield of Mediterranean annual pastures and nitrogen modulates the response

Current ozone levels threaten gross primary production and yield of Mediterranean annual pastures and nitrogen modulates the response

Productivity and quality of dehesa pastures in relation to global change : increasing tropospheric ozone and nitrogen deposition

Genetic potential of wild birdsfoot trefoil (Lotus corniculatus L.) seeds collected from different geographical locations regarding to nutrient composition and nutritive value

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