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گواهی نمایه سازی مقاله soil methan emission from afforested areas with pinus eldarica and robinia pseudoacacia in cheetgar park,iran

عنوان مقاله: soil methan emission from afforested areas with pinus eldarica and robinia pseudoacacia in cheetgar park,iran
شناسه (COI) مقاله: NIAC01_219
منتشر شده در اولین کنفرانس بین المللی ایده های نو در کشاورزی در سال ۱۳۹۲
مشخصات نویسندگان مقاله:

samaneh bahadori - Department of Soil Sciences, Faculty of Agriculture and Nat ural Resources, Karaj Branch, Islamic Azad University, Karaj, Iran
vilma bayramzadeh - Department of wood Sciences, Faculty of Agriculture and Natural Resources, Karaj Branch,Islamic Azad University, Karaj, Iran
mahdi hashemi - department of chimestry sciences buali sina university hamedan iran
mohammad lotfollahi - Department of soil Sciences, Faculty of Agriculture and Natural Resources, Karaj Branch, Islamic Azad University, Karaj, Iran

خلاصه مقاله:
The increase in the concentration of the major greenhouse gases (GHG’s) in the atmosphere is considered one of the main factors causing the warming (IPCC2006). Methane contributes about 20% of the direct radiative forcing due to long-lived greenhouse gases affected by human activities. Most work on methane (CH4) emissions from natural ecosystems has focused on wetlands, however,less attention has been directed toward forests ecosystems, which could be temporarily methane sources. Tree physiology influences both the production and oxidation of CH4, and can play an important role in determining whether a particular forest is a net source or sink of CH4.purpose of this study was to gain insight into the influence of plants species,on the CH4 emission of soil.then selected areas in Cheetgar Park with Pinus Eldarica and Robinia plantation.MATERIALS AND METHODS This study was conducted in the Tehran cheetgar park (51°10´E &35°45´N).Cheetgar Park area covers814he. and the climate is temperate with a mean annual temperature of 17°C and a mean annual precipitation of 272mm for the period( 1997–2013). the afforested areas with Pinus eldarica and Robinia pseudoacacia and with clay - loam textured soil were selected. Then soil samples were prepared from the 3 circular plots with a radius of 50 meters in each area from 0~40 cm in depth ( 6 samples/circular plot) . Soil organic carbon, activate carbon, soil bulk density and soil CH4 emission were measured .For measurement of soil CH4 emission, the soil cores were placed in 50 cm long and 8 cm diameter PVC pipes. Additionally, the top 10 cm of each pipe served the purpose of an air filled gas collection chamber (headspace). The soil cores were incubated at temperatures 25°C under controlled laboratory conditions ( Regina et al., 1999). The gas samples were collected with a syringe from the headspace, and the concentration of CH4 were determined with a GC2550TG gas chromatograph. Methane was detected by a flame ionization detector (FID).Statistical analyses were carried out with StatGraphics.RESULTS AND DISCUSSION The results of the soil analyses showed that there were statistically significant differences between soil properties of the studied areas (P˂0.05) as follow: percentage of soil organic carbon 0.5 ,1 , activate carbon 500ton/he,700(ton/he),soil bulk density0.97(gr/cm3),0.93(gr/cm3).,respectively for Pinus eldaricaand Robinia pseudoacacia . Also soil CH4 emission was higher for Pinus eldarica than Robinia pseudoacacia.According to obtained results, it could be concluded that, the high bulk density which can limit the aeration need for oxidation of methan and lower organic and active carbon were responsible for higher rate of soil methane emission in the area with Pinuseldarica.

کلمات کلیدی:
Greenhouse gas, Methane,Pinuseldarica,Robiniapseudoacacia

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