库布齐沙漠典型防护林土壤养分特征

以库布齐沙漠典型防护林为研究对象,通过测定不同防护林的土壤理化性状,评估该防护林系统的土壤改良效益,为库布齐沙漠防护林的管理与养护提供理论依据.结果 表明:(1)库布齐沙漠防护林营建15年后,在植被改良的作用下,原有的流沙质量发生了明显改变.与流沙环境相比,研究区土壤的碱解氮(AN)、速效磷(AP)、速效钾(AK)、有...

Soil Nutrient Characteristic of Typical Shelterbelt in Hobq Desert

Taking the typical shelter forest in Hobq Desert as the object, the physical and chemical properties of soil in different forests were measured to evaluate the soil improvement benefits of the shelter forest system and provide theoretical support for the management and maintenance of shelter forest in Hobq Desert. The results showed that: (1) 15 years after the establishment of the Hobq Desert Shelter Forest, the original quicksand texture had changed significantly due to the effect of vegetation improvement. Compared with the quicksand environment, the contents of soil AN, AP, AK, SOM, TN, TP and TK increased by 243.95%, 37.89%, 108.84%, 138.71%, 118.77%, 42.41% and 45.77%, respectively. Compared with other types of vegetation, the contents of SOM, AK and TN in Elaeagnus angustifolia shelter forest increased the most, with the increase of 188.36%, 151.84% and 158.67%, respectively. The AN content in Pinus sylvestris var. mongolica shelterbelt had the largest increase, with an increase of 481.86%. The physical properties of soil showed different rules with the increasing of soil layers. Compared with the quicksand environment, soil water content (SWC) and porosity (PV) changed significantly. (2) The variation ranges of C/N, C/P and N/P in this area were 7.46~27.22, 2.11~14.17 and 0.07~0.62, respectively. Vegetation type, soil depth and the interaction between them significantly affected soil quality, and vegetation restoration process in this study area was mainly limited by nitrogen content. (3)The redundancy analysis showed that the SWC and PV had significant correlation with the soil nutrients and stoichiometric characteristics of the shelter forest, and they were also the main environmental factors that affected the soil nutrients and stoichiometric features of the Hobq Desert Shelterbelt. These results could provide data support for evaluating the soil improvement benefits of the Shelter Forest System in Hobq Desert.