پديد آورندگان :
ﻣﺮﯾﺦ ﭘﻮر، ﻫﺎﺟﺮ داﻧﺸﮕﺎه ﺳﯿﺪ ﺟﻤﺎل اﻟﺪﯾﻦ اﺳﺪآﺑﺎدي - ﮔﺮوه ﮐﺸﺎورزي، اﺳﺪآﺑﺎد، ﻫﻤﺪان , ﻋﻈﯿﻤﯽ، ﺑﻬﺎره ﺳﺎزﻣﺎن ﺣﻔﺎﻇﺖ ﻣﺤﯿﻂ زﯾﺴﺖ - ﭘﮋوﻫﺸﮑﺪه ﻣﺤﯿﻂ زﯾﺴﺖ و ﺗﻮﺳﻌﮥ ﭘﺎﯾﺪار - گروه ﭘﮋوﻫﺸﯽ ارزﯾﺎﺑﯽ و ﻣﺨﺎﻃﺮات ﻣﺤﯿﻂ زﯾﺴﺖ، ﺗﻬﺮان، اﯾﺮان , ﺑﺎدام ﻓﯿﺮوز، ﺟﻠﯿﻞ ﺳﺎزﻣﺎن ﺣﻔﺎﻇﺖ ﻣﺤﯿﻂ زﯾﺴﺖ - ﭘﮋوﻫﺸﮑﺪه ﻣﺤﯿﻂ زﯾﺴﺖ و ﺗﻮﺳﻌﮥ ﭘﺎﯾﺪار - گروه ﭘﮋوﻫﺸﯽ اقتصاد ﻣﺤﯿﻂ زﯾﺴﺖ، ﺗﻬﺮان، اﯾﺮان , ﻣﻨﺘﻈﻤﯽ، ﺷﻬﺎب اﻟﺪﯾﻦ ﺳﺎزﻣﺎن ﺣﻔﺎﻇﺖ ﻣﺤﯿﻂ زﯾﺴﺖ - ﭘﮋوﻫﺸﮑﺪه ﻣﺤﯿﻂ زﯾﺴﺖ و ﺗﻮﺳﻌﮥ ﭘﺎﯾﺪار - ﮔﺮوه ﭘﮋوﻫﺸﯽ ﺗﻨﻮع زﯾﺴﺘﯽ، ﺗﻬﺮان، اﯾﺮان
چكيده لاتين :
Wind erosion and thunderstorms bring about significant adverse consequences, including air
pollution, reduced visibility, wear and tear of industrial machinery, soil structure destruction, and adverse effects
on soil fertility. In recent years, the aerosol pollution caused by sand storms has turned into a serious health
threat for Iranian people. In addition to being detrimental to human health, the adverse consequences mentioned
above will also cause many problems for ecosystem processes. That is why the fight against erosion has received
worldwide attention. The application of mulch is a method widely used to control wind erosion and stabilize
sand grit and dust hotspots. Mulch is defined as any natural and artificial material that is promoted and applied to
the soil surface together with crop residues, plastic films, asphalt, emulsion mulch, oil, petroleum residue, nanoclay
matters, and livestock manure. Therefore, this study sought to examine the chemical properties of soils
covered by two emulsion mulches.
Materials and Methods: This experimental study was conducted in some parts of large desert areas located in
Aran and Bidgol counties. The treatment items examined in this study were the type of mulch, time of mulch
application, and soil depth. In addition to harvesting soil samples covered with mulch, control soil samples were
also collected for comparison. PH, EC, concentration of cations (Ca, Mg, K and Na), and anions (NO3, HCO3,
SO4, Cl) were other parameters examined in this study.
Results and Discussion: The results showed that the application of emulsion mulch reduced the soil's pH and
EC. In fact, reducing soil salinity leads to a decrease in soil cations and anions concentration, providing suitable
conditions for plant growth and establishment by maintaining moisture and reducing evaporation. It was also
found that moisture in soils covered by emulsion mulches was significantly higher than that of the control soil
during the study period (12 months), reducing the concentration of cations. Considering the fact that the presence
of emulsion mulch in the soil surface leads to a decrease in its concentration of cations compared to that of the
control soil, this study's analysis of the dominant sodium cation in soil showed a significant decrease in treatment
mulch compared to that of the control mulch. Moreover, the concentration of chlorine and sulfate anions was
found to have decreased after the application of emulsion mulch, resulting in the creation of suitable conditions for plant cultivation in the region. In contrast, the study found that bicarbonate concentration in the soil increased
due to the presence of carbon in the emulsion mulch structure compared to that of the control soil sample.
Conclusion: There was a significant decrease in the amount of salinity in the soil treated with both types of
mulch compared to the control soil that received no mulch, the amount of which increased over time. The main
reason for the reduction of salinity in the soil treated with the two types of mulch could be the reduced water
evaporation from the soil surface caused by an increase in the soil's moisture. Code 1 emulsion mulch was more
efficient in maintaining the soil moisture than the other type of mulch. Increasing moisture affects the soil's
aggregation by increasing the adhesion between particles and, therefore, the velocity of wind erosion threshold
will be decreased. Furthermore, the study found a decrease in the pH of the soil covered by mulches. This
decrease in pH was more evident in surface samples, indicating a relative decrease in pH than that of the subsoil.
As soil salinity decreases after mulch application, the concentration of cations is also expected to decrease.
Among the cations examined in this study, the soil's dominant sodium cation suggested a significant decrease in
treated emulsion mulch compared to that of the control mulch. Possessing a lower sand percentage, Code 2
emulsion mulch was found to have a more decreasing effect on the cation concentration after 12 months of its
application. The study's results also revealed a reduction in the concentration of all studied cations, which
occurred 12 months after the application of Code 2 emulsion mulch, while the concentration of the cations had
not changed after six months of the application of the mulch.
The study also found that chlorine and sulfate anions significantly reduced in the studied anions of the treated
soils. The final results of this study suggested that both types of applied mulch could contribute to reducing the
effects of harmful cations and anions on plant growth and that the application of the mulches would allow more
plants to be grown in such areas. Moreover, the results of long-term tests showed the efficacy of the two applied
mulches in terms of their stability.
