TY - JOUR
T1 - Variations in spatial patterns of soil–vegetation properties over subsidence-related ground fissures at an arid ecotone in northeastern Iran
AU - Mohseni, Neda
AU - Sepehr, Adel
AU - Hosseinzadeh, Seyed Reza
AU - Golzarian, Mahmood Reza
AU - Shabani, Farzin
PY - 2017/3
Y1 - 2017/3
N2 - This study examines variations in the spatial patterns of soil–vegetation properties in the vicinity of subsidence-related ground fissures caused by groundwater over-pumping over an arid ecotone situated in northeastern Iran. It was assumed that subsidence-related fissures have a possible effect on the soil–vegetation structures. Vegetation metrics (mean canopy area, mean volume, vegetation cover percentage) and soil properties (EC, pH, CaCO3, particle size distribution) were measured for locations with differing spatial expanses of ground fissures, including surface ground fissures, deeper ground fissures, as well as those exhibiting no signs of ground fissure. Statistical analyses indicated significant differences (P < 0.05) in the spatial patterns of vegetation and soil properties for locations with different expanses of ground fissures. Greater degradation of soil–vegetation, presenting as mortality of plants and the formation of impermeable layers on the soil surface, was observed around deep fissures linked to groundwater over-pumping, in comparison with other locations. These findings confirm the relationship between heterogeneities in patterns of vegetation and soil properties and variations in structure and extent of ground fissures, as well as indicating that the expansion of groundwater over-pumping-induced surface ground fissures can promote soil–vegetation degradation over time, leading ultimately to barren soils.
AB - This study examines variations in the spatial patterns of soil–vegetation properties in the vicinity of subsidence-related ground fissures caused by groundwater over-pumping over an arid ecotone situated in northeastern Iran. It was assumed that subsidence-related fissures have a possible effect on the soil–vegetation structures. Vegetation metrics (mean canopy area, mean volume, vegetation cover percentage) and soil properties (EC, pH, CaCO3, particle size distribution) were measured for locations with differing spatial expanses of ground fissures, including surface ground fissures, deeper ground fissures, as well as those exhibiting no signs of ground fissure. Statistical analyses indicated significant differences (P < 0.05) in the spatial patterns of vegetation and soil properties for locations with different expanses of ground fissures. Greater degradation of soil–vegetation, presenting as mortality of plants and the formation of impermeable layers on the soil surface, was observed around deep fissures linked to groundwater over-pumping, in comparison with other locations. These findings confirm the relationship between heterogeneities in patterns of vegetation and soil properties and variations in structure and extent of ground fissures, as well as indicating that the expansion of groundwater over-pumping-induced surface ground fissures can promote soil–vegetation degradation over time, leading ultimately to barren soils.
KW - Bare soil
KW - Fissures
KW - Dryland
KW - Land degradation
KW - Iran
KW - Subsidence
UR - http://www.scopus.com/inward/record.url?scp=85015809096&partnerID=8YFLogxK
U2 - 10.1007/s12665-017-6559-z
DO - 10.1007/s12665-017-6559-z
M3 - Article
SN - 1866-6280
VL - 76
JO - Environmental Earth Sciences
JF - Environmental Earth Sciences
IS - 6
M1 - 234
ER -