Abstract：[Background] Soil microbial biomass and enzyme activity are very sensitive to the changes of environmental factors and land use types. They are important biological indicators to evaluate the dynamics of soil quality and reflect the transformation of ecosystem functions. Land use change has a significant and far-reaching influence on soil physicochemical and biological properties, which may be one of the important factors of soil impoverishment and soil erosion in rock mountainous areas of northern China.[Methods] In order to reveal the effects of different land-use types on soil microbial biomass carbon and nitrogen contents and enzyme activities, soil samples were collected from farmland (NT), abandoned land (LHD) and 3 kinds of typical artificial pure forests:Robinia pseudoacacia(CH), Quercus variabilis(SPL), Platycladus orientalis(CB), in rocky mountain areas of northern China. Soil samples were collected from 0-10, 10-20 and 20-30 cm soil layers. Soil microbial biomass carbon (MBC), nitrogen (MBN) contents and the activities of 4 enzymes (catalase, β-glucosidase, urease and protease) were compared and analyzed.[Results] In the 0-30 cm soil layer, soil MBC and MBN contents of NT and CB were significantly higher than those of LHD, CH and SPL (P<0.05). Soil MBC and MBN contents of NT were 752%, 927% and 537%, 332%, 227% and 79% higher than those of LHD, CH and SPL, respectively (P<0.05).The activities of 4 enzymes in NT, LHD and CB all showed a high level, while the SPL soil showed the lowest catalase, protease and β-glucosidase activities (P<0.05). The average urease activities of LHD, NT, CB and SPL in 0-30 cm soil layer were 562%, 536%, 514% and 302% higher than that of CH soils (P<0.05). With the increase of soil depth, the activities of 4 soil enzymes showed significantly decreased trends (P<0.05). Soil MBC, MBN contents and the activities of 4 enzymes were significantly correlated with soil nutrient factors, and soil bulk density (P<0.05). Land-use types had significant effects on soil MBC, MBN, MBC/MBN, dissolved organic carbon (DOC), dissolved nitrogen (DN) contents and the activities of 4 enzymes (P<0.05). Except for soil MBC and DOC, soil depth had significant influence on the other soil properties (P<0.05).[Conclusions] NT and CB land-use types demonstrated high soil MBC and MBN contents as well as the activities of 4 enzymes. Therefore, normal farmland cultivation and plantation of P. orientalis artificial forests are beneficial to improving soil physicochemical and biological properties and soil fertility, which are recommended as rational land use types for the sustainable development of rocky mountain areas in northern China.
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PAN Minghao, ZHU Qingzheng, GONG Shanshan, ZHANG Zhihua, LEI Lang, KONG Yuhua. Effects of different land-use types on soil biological and physicochemical properties. SSWC, 2021, 19(4): 24-33.
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2021, Vol. 19 
