بررسي تاثير گونه هاي Haloxylon persicum و Atriplex lentiformis بر خصوصيات خاك و گونه هاي بومي در عرصه بياباني شهرستان تبريز

چكيده انگليسي :

۴ Studying the Haloxylon persicum and Atriplex lentiformis influences on soil properties and indigenous species of the Neyriz deserted region Dorna muselu D muselu@yahoo com February 2012 Department of Nature Resources Isfahan University of Technology Isfahan 84156 83 111 Iran Language FarsiDegree M ScSupervisor Sayed Jamaleddin Khajeddin khajeddin@cc iut ac irAbstract Employing vegetation and soil correlation information is a fundamental issue in natural andcultivated vegetation management and planning Considering the high expenditure of the plantspecies cultivating importance on soil erosion control and windbreak construction it is essential toinvestigate the positive and negative affects of these species on the habitat intending the studiedspecies selecting or deselecting for the other similar site planning The aim of the present study isto discover the affects of 20 years old mixed cultivated Haloxylon persicum and Atriplexlentiformis plantation on their habitat soil properties as well as indigenous species of the Neyrizdeserted region in Iran The stratified random sampling method was employed for field samplingand studying therefore the following four region were selected 1 Under canopy of the Haloxylonpersicum shrub 2 Under canopy of the Atriplex lentiformis shrub 3 Out of the shrub canopy butbetween the above named shrub species in the plantation site and 4 The control region which haddistance from the plantation site The soil was sampled for the region 1 and 2 with 50 100 and 150Cm detachments from the Haloxylon persicum and Atriplex lentiformis trunks The soil undercanopy was dogged to collect the samples from 0 15 Cm and 15 30 Cm in depth For the site 3 and4 soil samples were collected from the same depths But additional samples were collected from30 70 Cm and below 70 Cm as well The soil samples were sent to the laboratory of theDepartment of Natural Resources Isfahan University of Technology for further analysis The soilpH EC clay sand silt concentration of the sodium potassium calcium and organic matterwere measured Species data collected with a 5m by 5m quadrat which located in systematicrandomized plan and the plant height density and crown cover diameter were measured Analysesof variance and ordination method used to study the soil and species data relations utilizing theCANOCO and SPSS software s The results demonstrates which the both studied species increaseremarkably the soil pH EC sodium potassium calcium and organic matter under their canopy Also these factors increase between the planted shrubs and the changes are statistically significant The measured elements changes are in a manner that their concentration is higher towards the planttrunk so they absorb the elements with their roots and deposits on the soil surfaces through the leafand small branches shedding The Haloxylon persicum increases the studied soil parameters morethan the Atriplex lentiformis The amount of studied materials decreases with soil depth increasing It is noticeable that the 20 years old Haloxylon persicum plantation has more effects on soilparameters increasing but none of them has effect on soil texture Both species have omitted mostof the indigenous annual and perennial species from their canopy beneath and from the spacesbetween shrubs On the other hand the height of the established indigenous species has reduced the density and crown diameter of these species contracted under the studied species canopy Key words Haloxylon persicum Atriplex lentiformis soil properties indigenous species

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بررسي تاثير گونه هاي Haloxylon persicum و Atriplex lentiformis بر خصوصيات خاك و گونه هاي بومي در عرصه بياباني شهرستان تبريز