Wyniki wyszukiwania - BazTech

1

Botanical Diversity of Arid Steppe in South East of Algeria (Biskra)

Belhadj Amina, Allache Fatma Demnati, Boulghobra Nouar, Mebrek Naima

Journal of Ecological Engineering

|

2023

|

Vol. 24, nr 1

120--134

EN

In the light of climate change, it is important to acquire the information on the diversity of flora in order to ensure rational use of steppe rangelands. The present study aimed at diagnosing the botanical and the taxonomic diversity of the arid steppe plant communities in South East of Algeria. A total of 216 phytoecological sampling, were collected in three sites and one sample for each month during 2017 and 2018. The vegetation was analyzed using various species diversity parameters (abundance, species richness, life forms, alpha and beta diversity indices and disturbance index). Results show that 985 plant individuals were classified into 27 species, 27 genera and 14 families, with predominance of Chenopodiaceae and Asteraceae in the arid steppe of El-Haouch, and remarkable dominance of Chamaephytic and Therophytic plants in different phytoecological groups. The state of vegetation degradation in a susceptible environment on Algeria’s rangeland in the South East which is confirmed by the low values of Shannon, Jaccard indices and the values of disturbance index ranged between 50 and 85.71%. The alpha diversity parameters of the different phytoecological groups have low values, which reflect a more fragile homogeneous ecosystem, unfavorable life conditions and the absence of certain species of high pastoral value.

2

Plant Diversity in a Constructed Wetland for Pollutant Parameter Processing on Leachate: A Review

Arliyani Isni, Tangahu Bieby Voijant, Mangkoedihardjo Sarwoko

Journal of Ecological Engineering

|

2021

|

Vol. 22, nr 4

240--255

EN

The leachate from landfill constitutes high pollutant. The high pollutant content impacts the public and ecosystem health surrounding the landfill site. Therefore, it is essential to process the leachate first before its disposal to water body. Landfill leachate processing can be carried out using three processes, i.e., physical-chemical, biological, and a combination of those. A constructed wetland is currently considered as an environmentally friendly technology to tackle water pollution and leachate. Another advantage of a constructed wetland is the low operational cost and natural maintenance, so it can be a solution related to the cost, technical, and operating system problems of conventional processing. This article aimed to discover the characteristic differences of landfill leachate, constructed wetland installation position, and types of plants used in the constructed wetland. This article was written using the literature reviews from experimental studies on water processing with the same parameter for leachate and leachate processing. The literature review result shows that landfill leachate processing depends on different leachate characteristics. The toxic quality of landfill leachate was found through a toxicity test. Leachate treated by the physical-chemical process contains toxic and non-biodegradable organic substances. Hence, the physical-chemical methods should be applied at the beginning of the process and coupled with the biological method at the end of the process to improve the treatment quality. A constructed wetland with diverse plants was found to be more effective in biomass distribution, less prone to seasonal variations, and had a more diverse microbe population than the constructed wetland with a single plant.

3

Influence of plant diversity and earthworm casts on the abundance and species composition of the enchytraeids (Oligochaeta: Enchytraeidae) in a lysimetric experiment

Makulec G., Pilipiuk I.

Polish Journal of Ecology

|

2000

|

Vol. 48, nr 3

185-193

EN

An experiment was conducted in plastic pots filled with loamy sand insered into the soil. Half of the pots were sown with one species, orchard grass, and half with a mixture of six grass species. Every year at the end of May, half of the pots in each variant enriched with 300 g d.w. of earthworm casts per pot. The experiment was continued for three years. Changes in numbers of enchytaeids were obserwed, and at the end of the experiment also their species composition. Total numbers steadily increased from about 5 10^3 ind. m^-2 to over 60 10^3 ind. m^-2. In all years, enchytraeids were significantly more abundant in monoculture of orchard grass. No statistically significant effect of earthworm casts on enchytraeid abundance was found. A total of 10 enchytraeid species were recorded. No unequivocal differences in the species composition and dominance structure of enchytraeid community were found between different variants of the experiment.