Effect of retention of run-off water and grazing on soil and on vegetation of a temperate humid grassland

Alconada, M.; Ansín, O. E.; Lavado, Raúl S.; Deregibus, V. A.; Rubio, Gerardo; Boem, Flavio Hernán Gutiérrez

doi:10.1016/0378-3774(93)90031-5

Cited by 21 publications

(7 citation statements)

References 21 publications

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“…During the waterlogging periods, grassland biomass production increases (15). These same result was also observed by man-provoked floods (16). Consequentely, plant demands of available nitrogen have to be higher under these conditions.…”

Section: Introductionsupporting

confidence: 72%

Non‐exchangeable ammonium behavior of a grassland soil of the flooding Pampa under waterlogging

Rubio

Lavado

1994

Communications in Soil Science and Plant Analysis

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A representative grassland soil of the lowland areas of the Flooding Pampa (Argentina) was sampled to study the dynamics of the nonexchangeable ammonium under waterlogging conditions. Most of the external factors determining fixed ammonium release and fixation were considered. There was no net release of ammonium from the clay fixing-sites to the soil solution, when this soil was flooded under laboratory conditions. We conclude that the non-exchangeable ammonium fraction in this soil is very stable and with little importance as a nitrogen source for plants.

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Section: Introductionsupporting

confidence: 72%

Non‐exchangeable ammonium behavior of a grassland soil of the flooding Pampa under waterlogging

Rubio

Lavado

1994

Communications in Soil Science and Plant Analysis

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“… (1) Taboada & Panuska (1985); (2)Batista & León (1992); (3)Berasategui & Barberis (1982); (4)Lavado & Taboada (1985); (5)Alconada et al (1993); (6)Lavado & Taboada (1988); (7)Taboada and Lavado (1988); (8)Batista (1991); (9)Lavado et al (1992); (10)Taboada et al (1998); (11)Ragonese & Covas (1947); (12) Sánchez et al. (1976). …”

Section: Resultsunclassified

Cross‐scale vegetation patterns of Flooding Pampa grasslands

2001

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Summary 1The spatial pattern of vegetation heterogeneity across different scales may indicate the major environmental controls on vegetation structure, and thus guide strategies for the conservation of biodiversity. 2 We analysed cross-scale vegetation patterns in a 90 000-km 2 area of natural grasslands in the Flooding Pampa, Argentina. We assessed the contribution of regional (latitudinal) and landscape (topographic) patterns of species turnover to overall heterogeneity using data from 749 censuses. 3 A large proportion of the variation in species composition across the entire region was observed at very fine spatial scales (0.1-10 km 2 ), associated with subtle topographic features and soil salinity gradients. Latitudinal variation played a secondary role. 4 Species turnover among stands occupying different landscape positions at the same latitude was 50% greater than among inventories encompassing two degrees of latitude. The fine-grain heterogeneity determined that an area of 10 km 2 was often sufficient to include 50% of all vascular plant species of the region. 5 Although a large proportion (nearly 70%) of the vascular flora was composed of rare (satellite) species that occurred in less than 10% of the samples, few core species (i.e. those occurring in more than 90% of the samples) were seen at any scale of analysis. 6 Latitude contributed most clearly to variation in species composition among the zonal communities located in well-drained soils where differences in relative cover of C 3 and C 4 grasses were seen. However, photosynthetic pathways still varied more along salinity or topographic gradients than across regions. A latitudinal pattern in abundance of the different Poaceae tribes was also consistent with their climatic classification. 7 Alpha diversity showed a threefold variation among different stands within a landscape: it increased from low topographic positions and high soil salinity to high topographic positions and low salinity. However, it was constant among surveys within the region. 8 Nearly 25% of the species were exotic, mostly European, whose invasion was promoted by livestock grazing. Compared with the native species, exotics were consistently enriched in annuals, particularly forbs, across latitude, and were less tightly associated with landscape heterogeneity than native species.

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“…Floods occur almost annually from autumn through spring, mainly affecting lower landscape areas. Extensive floods, which may last several months, are less frequent but exert a profound influence on vegetation dynamics and soil properties (Chaneton et al, 1988(Chaneton et al, , 2002Lavado & Taboada, 1988;Chaneton & Facelli, 1991;Alconada et al, 1993).…”

Section: Study Regionmentioning

confidence: 99%

Floristic heterogeneity of flooding Pampa grasslands: a multi-scale analysis

Chaneton

Perelman

León

2005

Plant Biosystems - An International Journal Dealing with all As

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The present paper describes vegetation heterogeneity at contrasting spatial scales in order to analyse patterns of floristic diversity and vegetation -environment relations in the Flooding Pampa grasslands of Argentina. The overall grassland flora contains a large proportion of exotic species, which are mostly annual forbs. At a regional scale, there is a latitudinal turnover in relative abundance of major grass tribes, and C 3 grasses become increasingly common in grasslands at higher latitudes. The principal gradients in overall vegetation composition were associated with landscape-level changes in topography and soil chemistry. Both native and exotic species richness increased with topographic elevation, and markedly decreased in flood-prone habitats with acidic or saline soils. In remnants of tussock grassland, the predominant physiognomy of the Pampas in pre-settlement times, the presence of the tall native grass Paspalum quadrifarium is a strong determinant of local community structure, reducing the percentage of exotic species. Heterogeneity analysis at the community scale revealed a fine-grained species packing that was in sharp contrast with spatial mosaics observed in other grasslands under livestock grazing. At this scale, spatial variation in floristic composition correlated with changes in various soil parameters, but not with subtle differences in topographic relief. The studied grasslands possess some unique features that contribute towards a better understanding of how current vegetation heterogeneity is controlled by historical, environmental and management factors.

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Effect of retention of run-off water and grazing on soil and on vegetation of a temperate humid grassland

Cited by 21 publications

References 21 publications

Non‐exchangeable ammonium behavior of a grassland soil of the flooding Pampa under waterlogging

Non‐exchangeable ammonium behavior of a grassland soil of the flooding Pampa under waterlogging

Cross‐scale vegetation patterns of Flooding Pampa grasslands

Floristic heterogeneity of flooding Pampa grasslands: a multi-scale analysis

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