Geografia Fisica e Dinamica Quaternaria, Volume (42), No (42), Year (2019-12) , Pages (99-112)

Title : ( Microgeomorphology related soil characteristics determine the heterogeneity of biological soil crust communities )

Authors: mahvan hassanzadeh bashtian , Adel Sepehr , Masoumeh Bahreini , Mohammad Farzam ,

Citation: BibTeX | EndNote

Abstract

We examined how biological soil crust (BSC) communities are affected by micro-geomorphology and soil characteristics in an arid ecosystem in northeastern Iran. Sampling was carried out systematically in the summer of 2016 along a geomorphic gradient within an alluvial fan by using micro-scale plots (0.25 m2) and soil samples from the top soil layer (0-5 cm). According to the geomorphologic features and particle size distribution, the landform surfaces were divided into three units across the topographic gradient. From top downstream: Unit 1 involved coarse particles, Unit 2 included medium, and unit 3 comprised fine deposits., A total of 16 samples were taken for each unit (48 samples in total) along the alluvial fan from the apex to the base sector. The results indicated that micro-geomorphic and soil characteristics play an important role in the development of biological soil crust (BSC) micro-habitats. Decreasing content of calcium carbonate, pH, and soil salinity versus increasing soil moisture and clay content along the gradient of the alluvial fan showed a relevant correlation with increased BSCs coverage. BSCs increased along the landform gradient, although their diversity tended to decrease; in that way complex communities in the apex (Unit 1) involved cyanobacteria, lichen, moss-es, and algae, while the dominant BSCs in the base (Unit 3) included moss species.

Keywords

, Alluvial fan, Biological Soil Crusts (BSCs), Microgeomorphology, Soil heterogeneity
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@article{paperid:1077532,
author = {Hassanzadeh Bashtian, Mahvan and Sepehr, Adel and Bahreini, Masoumeh and Farzam, Mohammad},
title = {Microgeomorphology related soil characteristics determine the heterogeneity of biological soil crust communities},
journal = {Geografia Fisica e Dinamica Quaternaria},
year = {2019},
volume = {42},
number = {42},
month = {December},
issn = {0391-9838},
pages = {99--112},
numpages = {13},
keywords = {Alluvial fan; Biological Soil Crusts (BSCs); Microgeomorphology; Soil heterogeneity},
}

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%0 Journal Article
%T Microgeomorphology related soil characteristics determine the heterogeneity of biological soil crust communities
%A Hassanzadeh Bashtian, Mahvan
%A Sepehr, Adel
%A Bahreini, Masoumeh
%A Farzam, Mohammad
%J Geografia Fisica e Dinamica Quaternaria
%@ 0391-9838
%D 2019

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