Environmental factors controlling vegetation attributes, soil nutrients and hydrolases in South Mediterranean arid grasslands

2021 ◽  
Vol 161 ◽  
pp. 106155
Author(s):  
Wahida Ghiloufi ◽  
Mohamed Chaieb
Keyword(s):  
Environmental Factors ◽  
Soil Nutrients ◽  
Arid Grasslands

Environmental factors controlling the distribution of forbs on coastal foredunes in Cape Hatteras National Seashore

1974 ◽  
Vol 52 (5) ◽  
pp. 1057-1073 ◽  
Author(s):  
A. G. van der Valk
Keyword(s):  
Soil Moisture ◽  
Environmental Factors ◽  
Soil Nutrients ◽  
Experimental Work ◽  
Salt Spray ◽  
Cape Hatteras ◽  
Soil Temperatures ◽  
Cape Hatteras National Seashore ◽  
Shifting Sand ◽  
Coastal Foredunes

Shifting sand, which either buries the seeds or seedlings of dune forbs or carries them away, is responsible for the absence of forbs on the front of the foredune and in other zones accumulating sand regularly. Experimental work with the seedlings of six dune forbs showed that they can withstand burial by no more than 5 cm of sand and that their seeds can survive burial under only 1 to 16 cm, depending on the species. At least 20 to 30 cm of sand normally accumulates each winter in a zone subject to regular sand deposition. Salt spray plays a secondary role in preventing the establishment of forbs on the front of the foredune. It is responsible for the elimination of species which may occasionally escape burial during the winter months and which happen to be susceptible to salt spray injury. Measurements of soil moisture, soil nutrients, and soil temperatures indicate that these factors differ only slightly on the front, top, and back of the foredune. These three factors, then, appear to have little influence on the distribution of the forbs.

scholarly journals Intra- and interspecific interactions and environmental factors determine spatial–temporal species assemblages of rodents in arid grasslands

2014 ◽  
Vol 30 (9) ◽  
pp. 1643-1655 ◽  
Author(s):  
Guangshun Jiang ◽  
Jun Liu ◽  
Lei Xu ◽  
Chuan Yan ◽  
Honglin He ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Interspecific Interactions ◽  
Species Assemblages ◽  
Arid Grasslands

ON TERMITARIA IN A SAVANNA ECOSYSTEM

1965 ◽  
Vol 43 (4) ◽  
pp. 641-650 ◽  
Author(s):  
R. J. A. Goodland
Keyword(s):  
Environmental Factors ◽  
Soil Nutrients ◽  
Woody Plants ◽  
Plant Cover ◽  
Ecological Distribution ◽  
British Guiana ◽  
Extensive Bibliography

During the course of a quantitative phytosociological analysis of the vegetation of the Northern Rupununi Savanna, British Guiana, the termitaria were measured by the Quarter Method of the Wisconsin School in a manner similar to that for trees. The ecological distribution of the termitaria was found to be correlated with quantitative expressions of the vegetation and the environmental factors. The termites impoverish the surrounding soils by concentrating soil nutrients into their termitaria. They reduce the plant cover and decrease the water-retaining capacity of the soils. Termites are shown to be an integral part of the savanna ecosystem. Termites may aid the growth of woody plants by improving the drainage and allowing the growth of the roots of phreatophytes through a hard pan. Termitaria, termites, and their effects on the soil and the vegetation are briefly discussed in general. Also presented are a chart of the savanna ecosystem and an extensive bibliography.

scholarly journals Struktur Komunitas Mikroartropoda Tanah di Lahan Pertanian Organik dan Anorganik di Desa Batur Kecamatan Getasan Salatiga

2017 ◽  
Vol 18 (2) ◽  
pp. 164
Author(s):  
Shifa Aulia Husna ◽  
Mochamad Hadi ◽  
Rully Rahadian
Keyword(s):  
Community Structure ◽  
Environmental Factors ◽  
Water Content ◽  
Soil Nutrients ◽  
Sampling Method ◽  
Organic Materials ◽  
Soil Sampling ◽  
Soil Microarthropods ◽  
Physical Environmental Factors

Soil microarthropods is a arthropods that have an important role in decomposing organic materials and soil nutrients. On the farmland there is organic materials content and soil nutrients that abundants enough, because the addition of manure as a source of energy in the ground. The research was conducted in August-October 2015 took place in the field of organic and inorganic farmland in the Batur Village, Getasan Sub-district, Salatiga. This study aimed to examine the soil microarthropods community structure in organic and inorganic farmland as well as the effect of chemical and physical environmental factors to community structure of soil microarthropods. The study was conducted with samples of soil sampling method (PCT) and extracted using Barlese Funnel Extractor. Statistically show that diversity of soil microarthropods between organic and inorganic farmland are not significantly different. There is found 28 taxa of soil microarthropods in organic farmland and 23 taxa in inorganic. The highest total individual density of the taxa are exist in the organic farmland (2260 individual/ m²). The highest abundance of soil microarthropods taxa in inorganic farmland are Carabidae (26,55%) dan Prostigmata (13,27%), while in inorganic farmland are Carabidae (17,24%) dan larva Coleoptera (13,79%). The evenness of soil microarthropods taxa in organic farmland are much low compared with inorganicfarmland, because there is a dominant taxa (Carabidae). There is an influence relation between the chemical and physical environmental factors including water content, porosity, nutrient, and organic materials with community structure of soil microarthropods. Key words:Community structure, Soil microarthropods, Organic and inorganic farmland

scholarly journals Struktur Komunitas Mikroartropoda Tanah di Lahan Pertanian Organik dan Anorganik di Desa Batur Kecamatan Getasan Salatiga

2016 ◽  
Vol 18 (2) ◽  
pp. 157
Author(s):  
Shifa Aulia Husna ◽  
Mochamad Hadi ◽  
Rully Rahadian
Keyword(s):  
Community Structure ◽  
Environmental Factors ◽  
Water Content ◽  
Soil Nutrients ◽  
Sampling Method ◽  
Organic Materials ◽  
Soil Sampling ◽  
Soil Microarthropods ◽  
Physical Environmental Factors

Soil microarthropods is a arthropods that have an important role in decomposing organic materials and soil nutrients. On the farmland there is organic materials content and soil nutrients that abundants enough, because the addition of manure as a source of energy in the ground. The research was conducted in August-October 2015 took place in the field of organic and inorganic farmland in the Batur Village, Getasan Sub-district, Salatiga. This study aimed to examine the soil microarthropods community structure in organic and inorganic farmland as well as the effect of chemical and physical environmental factors to community structure of soil microarthropods. The study was conducted with samples of soil sampling method (PCT) and extracted using Barlese Funnel Extractor. Statistically show that diversity of soil microarthropods between organic and inorganic farmland are not significantly different. There is found 28 taxa of soil microarthropods in organic farmland and 23 taxa in inorganic. The highest total individual density of the taxa are exist in the organic farmland (2260 individual/ m²). The highest abundance of soil microarthropods taxa in inorganic farmland are Carabidae (26,55%) dan Prostigmata (13,27%), while in inorganic farmland are Carabidae (17,24%) dan larva Coleoptera (13,79%). The evenness of soil microarthropods taxa in organic farmland are much low compared with inorganicfarmland, because there is a dominant taxa (Carabidae). There is an influence relation between the chemical and physical environmental factors including water content, porosity, nutrient, and organic materials with community structure of soil microarthropods. Key words:Community structure, Soil microarthropods, Organic and inorganic farmland

Plant size, environmental factors and functional traits jointly shape the stem radius growth rate in an evergreen coniferous species across ontogenetic stages

2020 ◽  
Author(s):  
Zhili Liu ◽  
Kouki Hikosaka ◽  
Fengri Li ◽  
Liangjun Zhu ◽  
Guangze Jin
Keyword(s):  
Growth Rate ◽  
Environmental Factors ◽  
Light Intensity ◽  
Soil Nutrients ◽  
Functional Traits ◽  
Tree Growth ◽  
Plant Size ◽  
Tree Size ◽  
Coniferous Species ◽  
Ontogenetic Stages

Abstract Aims Plant size, environmental conditions and functional traits are important for plant growth; however, it is less clear which combination of these factors is the most effective for predicting tree growth across ontogenetic stages. Methods We selected 65 individuals of an evergreen coniferous species, Pinus koraiensis, with diameters at breast height (DBH) from 0.3 to 100 cm in Northeast China. For each individual, we measured the stem radius growth rate (SRGR, μm/year) for the current year, environmental factors (light, soil nutrients and water) and functional traits (leaf, branch and root traits). Important Findings SRGR increased with DBH when the DBH was lower than 58 cm, whereas it decreased with DBH when the DBH was larger than 58 cm. Structural equation modeling analysis suggested that , when the DBH was 0-15 cm, plant size had a direct negative influence on SRGR and an indirect positive influence on SRGR due to the light intensity above the plant. Plant size had direct positive and negative effects when the DBH was 16-58 cm and 59-100 cm, respectively. When the DBH was larger than 15 cm, soil parameters were more important than light intensity for SRGR. The functional traits selected for use in the best model were changed from the specific leaf area and wood density to the root nitrogen concentration with increasing tree size. In summary, plant size, environmental factors and functional traits jointly shaped tree growth, and their relative influence varied with size, suggesting that the resources limiting tree growth may change from light to soil nutrients with increasing tree size.

scholarly journals Soil Enzyme Activity and Soil Nutrients Jointly Influence Post-Fire Habitat Models in Mixed-Conifer Forests of Yosemite National Park, USA

Fire ◽  
2020 ◽  
Vol 3 (4) ◽  
pp. 54
Author(s):  
Jelveh Tamjidi ◽  
James A. Lutz
Keyword(s):  
Environmental Factors ◽  
Soil Properties ◽  
Soil Nutrients ◽  
Environmental Variables ◽  
National Park ◽  
Basal Area ◽  
Yosemite National Park ◽  
Relative Importance ◽  
Species Assemblage ◽  
Spatial Factors

Disentangling the relative importance of habitat filtering and dispersal limitations at local scales (<1 km2) in shaping species composition remains an important question in community ecology. Previous studies have examined the relative importance of these mechanisms using topography and selected soil properties. We examined both topography and edaphic properties from 160 locations in the recently burned 25.6 ha Yosemite Forest Dynamics Plot (YFDP) in Yosemite National Park, California, USA. In addition to eight soil chemical properties, we included phosphatases and urease enzymes in a definition of habitat niches, primarily because of their rapid changes with fire (compared to soil nutrients) and also their role in ecosystem function. We applied environmental variables to the distributions of 11 species. More species–habitat associations were defined by soil properties (54.5%) than topographically-defined habitat (45.4%). We also examined the relative importance of spatial and environmental factors in species assemblage. Proportions explained by spatial and environmental factors differed among species and demographic metrics (stem abundance, basal area increment, mortality, and recruitment). Spatial factors explained more variation than environmental factors in stem abundance, mortality, and recruitment. The contributions of urease and acid phosphatase to habitat definition were significant for species abundance and basal area increment. These results emphasize that a more complete understanding of niche parameters is needed beyond simple topographic factors to explain species habitat preference. The stronger contribution of spatial factors suggests that dispersal limitation and unmeasured environmental variables have high explanatory power for species assemblage in this coniferous forest.

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