Slope aspect influences plant association patterns in the Mediterranean matorral of central Chile

Badano, Ernesto I.; Cavieres, Lohengrin A.; Molina‐Montenegro, Marco A.; Quiroz, Constanza L.

doi:10.1016/j.jaridenv.2004.10.012

Cited by 146 publications

(112 citation statements)

References 32 publications

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“…For example, shrubs were positively associated with surface rocks in two out of four sites and community structure between areas under the shrub and areas outside was significantly different in three out of our four study sites. This supports the idea that spatial heterogeneity at a regional scale can modulate the spatial outcome of plant community assembly (see Badano et al 2005;Medina et al 2006). …”

Section: Between-sites Scalesupporting

confidence: 85%

Shrubs as foundation species in a high tropical alpine ecosystem: a multi-scale analysis of plant spatial interactions

Cáceres

Llambí

Rada

2014

Plant Ecology & Diversity

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Background: Studies on plant-plant interactions in alpine ecosystems show a strong bias for temperate vs. tropical latitudes and pay limited attention to the implications of biophysical heterogeneity beyond the local plant scale. Aims: To evaluate the effects of a dominant shrub (Hypericum laricifolium) on community organisation, integrating multiple scales of analysis, in a high Andean páramo in Venezuela. Methods: We compared plant cover, species richness and Shannon diversity between plots placed under the shrub and outside (plant scale); quantified the spatial relations of Hypericum with its conspecifics, heterospecifics and rocks at different radial distances, using covariance functions (patch scale); analysed the effects of Hypericum shrubs on total species richness in the community (site scale); and evaluated the consistency of our results among four sites within the same region (between-site scale). Results: Average species richness, Shannon diversity, and the abundance of common forbs and conspecific shrubs were consistently higher inside the Hypericum shrub, while the exotic Rumex acetosella was more abundant in open areas. However, the aggregated spatial distribution of conspecifics and other species extended beyond the local plant scale and there were no clear effects of Hypericum shrubs on community-level species richness. Conclusions: Shrubs can function as foundation species in tropical alpine environments, modifying local community structure and alpha diversity, but not necessarily the species richness of the overall community. Our results stress the need of analysing multiple spatial scales to interpret the role of plant-plant interactions (facilitation/competition) in heterogeneous alpine ecosystems.

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Section: Between-sites Scalesupporting

confidence: 85%

Shrubs as foundation species in a high tropical alpine ecosystem: a multi-scale analysis of plant spatial interactions

Cáceres

Llambí

Rada

2014

Plant Ecology & Diversity

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“…This is in contradiction to findings from semi-arid vegetation (Badano et al, 2005;Jurasinski, 2007;Sternberg & Shoshany, 2001). The difference in radiation which in e.g.…”

Section: Slope and Aspectcontrasting

confidence: 70%

“…Slope aspect and slope inclination may have a significant effect on species richness (Badano et al, 2005) and species composition especially in semi-arid vegetation (Sternberg & Shoshany, 2001). To obtain a distance measure integrating aspect and inclination, we use the model of a unit sphere and calculate great-circle distances between virtual locations.…”

Section: Slope and Aspectmentioning

confidence: 99%

Spatial Patterns of Phytodiversity - Assessing Vegetation Using (Dis) Similarity Measures

Babar¹,

Amarnath²,

Reddy³

et al. 2011

The Dynamical Processes of Biodiversity - Case Studies of Evolution and Spatial Distribution

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“…Thus, image reflectance after successful correction is expected to show almost no correlation with the instantaneous illumination condition, as demonstrated in Figure 5. However, in the long term, the land covers, especially vegetation, do show some correlation with slope orientation, because of the aspect-related differences in abiotic conditions [55][56][57], like moisture and temperature. Theoretically, aspect-related correlation between reflectance and illumination condition still exists even after successful topographic correction.…”

Section: Discussionmentioning

confidence: 99%

An Improved Physics-Based Model for Topographic Correction of Landsat TM Images

Bian

Lei

2015

Remote Sensing

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Abstract:Optical remotely sensed images in mountainous areas are subject to radiometric distortions induced by topographic effects, which need to be corrected before quantitative applications. Based on Li model and Sandmeier model, this paper proposed an improved physics-based model for the topographic correction of Landsat Thematic Mapper (TM) images. The model employed Normalized Difference Vegetation Index (NDVI) thresholds to approximately divide land targets into eleven groups, due to NDVI's lower sensitivity to topography and its significant role in indicating land cover type. Within each group of terrestrial targets, corresponding MODIS BRDF (Bidirectional Reflectance Distribution Function) products were used to account for land surface's BRDF effect, and topographic effects are corrected without Lambertian assumption. The methodology was tested with two TM scenes of severely rugged mountain areas acquired under different sun elevation angles. Results demonstrated that reflectance of sun-averted slopes was evidently enhanced, and the overall quality of images was improved with topographic effect being effectively suppressed. Correlation coefficients between Near Infra-Red band reflectance and illumination condition reduced almost to zero, and coefficients of variance also showed some reduction. By comparison with the other two physics-based models (Sandmeier model and Li model), the proposed model showed favorable results on two tested Landsat scenes. With the almost half-century accumulation of Landsat data and the successive launch and operation of OPEN ACCESS Remote Sens. 2015, 7 6297Landsat 8, the improved model in this paper can be potentially helpful for the topographic correction of Landsat and Landsat-like data.

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Slope aspect influences plant association patterns in the Mediterranean matorral of central Chile

Cited by 146 publications

References 32 publications

Shrubs as foundation species in a high tropical alpine ecosystem: a multi-scale analysis of plant spatial interactions

Shrubs as foundation species in a high tropical alpine ecosystem: a multi-scale analysis of plant spatial interactions

Spatial Patterns of Phytodiversity - Assessing Vegetation Using (Dis) Similarity Measures

An Improved Physics-Based Model for Topographic Correction of Landsat TM Images

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