关键词: 可口革囊星虫, 富集, 重金属, 生长, 蛋白质, 脂肪

Abstract: Soil erosion is an important factor restricting the sustainable development of Qinling Mountains region. This study aims to explore the soil erosion status and landscape pattern change in Qinling Mountains. Based on the results of remote sensing interpretation in 2005, 2010 and 2015, the general soil erosion equation (RUSLE) was used to calculate the soil erosion in those three years. After that, soil erosion status of the five major watersheds in Qinling Mountains was quantified. The relationships among soil erosion, land use, and topographic factors were analyzed, and the changes of soil erosion landscape pattern in the study area were clarified. Intensity and area of the soil erosion in Qinling Mountains significantly decreased from 2005 to 2015. The total erosion amounts in 2005 and 2015 were 0.90×10⁸ and 0.33×10⁸ t respectively, with a reduction of 63.33%. Soil erosion decreased from west to east and from south to north. Soil erosion was the most serious in the Jialing River basin, situated in the western part of the study area. The soil erosion modulus in 2005, 2010 and 2015 were 3872.80, 1454.31 and 1461.91 t·km^-2·a^-1, respectively. The soil erosion modulus was positively correlated with topographic factors such as slope and elevation, and showed obvious temporal and spatial variations. Soil erosion showed a weakening trend in different land use types in the region, with the most obvious reduction for the unused land. The fragmentation degree of the overall erosion landscape and the total number of patches in Qinling Mountains reduced, and the fragmentation index and the landscape heterogeneity decreased. The anthropogenic disturbance on the landscape of Qinling Mountains weakened over time, and the ecological environment was developing in a benign direction.

Key words: Phascolosoma esculenta, enrichment, heavy metal, growth, protein, lipid.