نوع مقاله : مقاله پژوهشی
نویسندگان
1 دانشجوی دکتری علوم خاک، دانشگاه علوم کشاورزی و منابع طبیعی گرگان
2 استاد گروه علوم خاک، دانشگاه علوم کشاورزی و منابع طبیعی گرگان
3 استادیار علوم خاک، گروه علوم خاک، دانشکده کشاورزی، دانشگاه فردوسی مشهد
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
Spatial variability in soil properties is a natural phenomenon, and recognizing these changes is inevitable, particularly in agricultural areas, for detailed planning and management. Correct management of agricultural operation and maintenance of soil organic carbon (SOC) are important factors in sustainable agriculture. This study was conducted to predict spatial variability of SOC using topography attributes and kriging, inverse distance weighted (IDW), and co-kriging techniques in loess lands of Toshan area, Golestan Province. In order to perform a systematic randomized sampling, 135 soil samples were collected from a depth of 0-20 cm. The results showed that ordinary co-kriging method with topography wetness index (TWI) as an auxiliary variable had the least error compared to kriging and inverse distance weighting (IDW) method and was more accurate to estimate soil organic carbon due to high spatial correlation of SOC with TWI. Interpolation map of soil organic carbon from whole part of hillslope showed lower SOC concentrations with increasing elevation and slope gradient. Spatial correlation ratio of SOC was different in various slope positions and these patterns were closely related to the structure of topography.
کلیدواژهها [English]