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- Title
Growth strategies as determinants of CO<sub>2</sub> sequestration and response to nitrogen fertilisation in C<sub>4</sub> grasses in South American natural grasslands.
- Authors
Marques, Anderson Cesar Ramos; de Oliveira, Leandro Bittencourt; Schwalbert, Raíssa; Del Frari, Bianca Knebel; Brunetto, Gustavo; de Quadros, Fernando Luiz Ferreira; Nabinger, Carlos; Nicoloso, Fernando Teixeira
- Abstract
Grass species grown in South American natural grasslands present different growth strategies related to variations in specific leaf area (SLA), leaf dry matter content (LDMC) and possible nitrogen (N) allocation. Nitrogen fertilisation can have effects on physiological processes such as CO2 assimilation; however, these responses can change depending on the growth strategy adopted by each species. The aim of the present study is to determine the effects of N fertilisation on SLA, LDMC and CO2 assimilation in eight C4 grass species: Axonopus affinis , Paspalum pumilum , P. notatum , P. urvillei , P. plicatulum , Andropogon lateralis , Saccharum angustifolium and Aristida laevis. These species were cultivated in pots filled with soil subjected to two conditions of N availability: nil (control) and 200 mg N kg–1 soil. The SLA of Axonopus affinis was 5.4 times higher than that of Aristida laevis. Axonopus affinis and P. pumilum recorded the lowest LDMC, their leaves showed 53% lower LDMC than observed for Aristida laevis , on average. Resource-capture species showed variation in leaf area with N addition to values 20% higher than the control, whereas species characterised by a resource-conservation growth strategy recorded variation in leaf area with N addition to values only 8% higher than the control. With N addition, the CO2 assimilation of resource-capture species represented variation (increase) nine times that of resource-conservation species compared with their respective controls. Resource-capture species have greater CO2 capture potential than resource-conservation species, mainly a result of N addition. The capacity for CO2 assimilation and response to nitrogen fertilisation by grasses from South American natural grasslands depends on the species present. Grasslands with species of high specific leaf area (SLA) and low leaf dry matter content (LDMC) have higher response potential to nitrogen fertilisation, with increase of 20% in leaf area and also have a potential 13 times higher for CO2 sequestration than grasslands with species with low SLA and high LDMC.
- Subjects
GRASSLANDS; GRASSLAND soils; LEAF area; NITROGEN; GRASSES; POTTING soils
- Publication
Crop & Pasture Science, 2020, Vol 71, Issue 8, p776
- ISSN
1836-0947
- Publication type
Article
- DOI
10.1071/CP19301