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Showing 3 results for Halophyte
Volume 1, Issue 4 (12-2013)
Abstract
Vetiver grass is known to survive under diverse soil and water conditions. In order to test its potential of salinity and aridity tolerance ability, the effect of salinity and aridity stress on the growth of the Vetiveria zizanioides was studied by growing plants in arid soils that receiving salinity stress. The experiment was conducted in a greenhouse, arrangement in a completely randomized design using 5 replications. Salinity levels of 4 (as control), 20, 30 and 40 dS m-1; Aridity levels of field capacity irrigation (as control), -6 and -10 bars were applied. There was no significant effect on growth, yield, water content and chlorophyll concentration with 20 dS m-1 salinity level. There was significant effect on Mentioned parameters with 30 and 40 dS m-1 salinity levels. The root and length weight in -6 bar were significantly greater than those in control. The water content and chlorophyll concentration were highest in 40 dS m-1 and -10 bars salinity-aridity. Water content and chlorophyll concentration were lowest in 4 dS m-1 and FC salinity-aridity treatments. Our results suggest that in EC between 20 to 30 dS m-1 with -6 to -10 bars water content Vetiveria zizanioides could be used for soil rehabilitation.
Volume 7, Issue 2 (4-2019)
Abstract
Aims: In the present work, carbon sequestration in different organs of 3 dominant of (A. , H. , and S. ) soil carbon sequestration of the corresponding habitats were examined.
Materials and Methods: The aboveground and belowground organs of 3 species were randomly sampled and oven dried. Three soil samples were taken from 0-0.15 and 0.15-0.3 m soil depths (SD). From these, soil organic carbon (SOC), soil texture (sand, silt, and clay), bulk density (BD), moisture content (MC), electrical conductivity (EC), and soil acidity (pH) were measured.
Findings: All of the tested had more carbon sequestration in the aboveground rather than organs. The highest value of carbon sequestration was observed in S. , which was about 18% and 90% more than the reported values of H. A. , respectively. Soil with S. greater content of organic carbon (1.5%) compared with H. 0.64%) and A. 0.63%), respectively. The results confirmed that soil top layer (0-0.15m) of patch area had more capability to sequester carbon (1.81%) in S. with the other species.
Conclusion: All the tested plants had higher carbon sequestration in the aboveground organs compared with the parts. The leaves had presented the lowest value compared with shoots and roots. The soil organic carbon of the species habitat varied from 0.63 (A. ) 1.5% (H. ). Moreover, with increasing the soil depth, carbon sequestration of the underlying soil layers decreased.
Amir-Reza Piruznia, Hossein Lotfalizadeh, Mohammad-Reza Zargaran, Samin Lotfalizadeh,
Volume 8, Issue 3 (9-2022)
Abstract
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Chalcidoidea play an important role in the biological control of many agricultural pests. The present study determines and compares the diversities of this superfamily in four ecosystems in the Lake Urmia basin. It is the largest hypersaline lake in the world with a large basin of different ecological conditions in northwest Iran. These stations were: Khajeh (K) and Tasuj (T) in Lake Urmia Basin (LUBin) and Khoda-Afarin (KA) and Tikme-Dash (TD) out of their (LUBout). Four months of Malaise trapping in these habitats resulted in a total of 512 specimens from 11 families of Chalcidoidea, including 6, 9, 10 and 10 families in K, KA, T and TD, respectively. Maximum abundance was observed in the T station with 192 and the minimum was in the K station with 38. However, the families, Encyrtidae and Chalcididae have maximum abundance in T and KA, respectively. The maximum activity of chalcidoid wasps was observed during June-August. The majority of the species were belonging to the family Mymaridae (25%), in LUBout habitats peaked at 47 specimens in TD during the sampling period, while the corresponding LUBin habitats peaked at 40 specimens in T. The two LUBout habitats had greater community similarity (60%) than found between in and LUBout habitats (42%) and diversity of chalcidoid wasps in LUBout was found much more than LUBin. Biodiversity studies showed that the KA station has the greatest values of diversity, evenness, and richness of Chalcidoidea. This station is located outside of Lake Urmia basin with the warmest and most humid climate and forest ecosystem on the margins of the Aras River.
