تغييرپذيري مكاني برخي از ويژگي‌ هاي شيميايي خاك در مزارع گندم دشت پاسارگاد

Spatial variability of some chemical soil properties at wheat field in Pasargad plain

اهداف اين پژوهش كمّي‌سازي تغييرپذيري مكاني برخي از ويژگي‌هاي شيميايي خاك بود. بنابراين 60 مكان آزمايشي با شبكه‌بندي منظم و به فواصل 500*500 متر ايجاد گرديد. ويژگي‌هاي pH، EC، CEC، و نيتروژن خاك اندازه‌گيري شدند. نتايج نشان داد كه pH كمترين و EC بيشترين تغييرات را داشت. همبستگي خطي معني‌داري بين برخي از ويژگي‌ها وجود داشت. بهترين مدل براي نيم‌تغييرنماي منفرد pH، مدل نمايي، براي EC مدل گوسي و براي CEC و نيتروژن مدل كروي بود. بهترين ميان‌ياب براي pH، EC، CEC، و نيتروژن خاك كريجينگ بود. مقادير pH خاك در جنوب منطقه بيشترين مقدار بود و به سمت شمال و شمال غربي از ميزان آن كاسته مي‌شد. مقادير قابليت هدايت الكتريكي و نيتروژن خاك از جنوب شرقي به شمال غربي منطقه افزايش داشت. مقادير CEC از شرق به غرب افزايش داست و بيشترين مقدار آن در جنوب غربي بود.

The objective of this study was to quantifying of spatial variability of some chemical soil properties. Thus a total of 60 site tests were conducted on a systematic squared grid pattern with 500*500 m. Soil properties including: EC, pH, CEC, and nitrogen were measured. The results showed that soil pH had lowest and EC had highest variation. There was significantly linear correlation between some studied characteristics. The best semi-variogram model for pH was exponential, for EC was Gaussian model, and for CEC and nitrogen was spherical model. The best interpolator for pH, EC, CEC, and nitrogen was kriging method. Amounts of soil pH was maximum in south of studied area, and its amounts decreased from south to north and west northern. Amounts of soil EC and nitrogen increased from south eastern to north western. Amounts of soil CEC increased from east to west, and its maximum amount was in south western of studied area.