Abstract: Glomalin-related soil protein (GRSP) plays an important role in enhancing soil productivity, and it has been one of the hot subjects in the soil nutrient research field. However, few studies have focused on the correlations between GRSP content and soil physicochemical properties. In this paper, soils from 0-80 cm depths were collected in Larix gmelinii plantations in the Lesser Khingan (Laoshan, Mao’ershan, Dongshan, Daqingchuan) in Northeast China. Multiple covariances analysis and collinearity analysis were used to analyze the spatial correlations between GRSP content and soil physicochemical properties (soil organic carbon, total nitrogen, total phosphorus, total potassium, available nitrogen, available phosphorus, available potassium, soil CaCO₃, available silicon, soil pH, soil bulk density and electrical conductivity). The results showed that, (1) soil depth was a key factor affecting the variations of GRSP content and soil physicochemical properties. (2) soil organic carbon and total phosphorus respectively contributed most to EE-GRSP content (β=0.312) and T-GRSP content (β=0.376), and soil bulk density was a negative factor contributing most to EE-GRSP content and T-GRSP content (β=-0.229, -0.212). (3) significant collinearity was observed between GRSP and total phosphorus (P<0.05). Our results showed that significant spatial heterogeneity was observed between GRSP content and soil physicochemical properties. These data suggested that GRSP had important effects on soil nutrient transportation and soil sustainable use. In addition, the soil factors which affected GRSP content and its ecological function were also identified. Our study provides a basis for assessing soil quality and soil function.

Key words: ground meteorological observation, thermal infrared remote sensing, urban thermal environment, numerical simulation., quantitative evaluation techniques