Soil physical and chemical properties and microbial characteristics of potato in different continuous cropping years on the Loess Plateau
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DOI:10.7606/j.issn.1000-7601.2019.04.25
Key Words: potato  continuous cropping years  physicochemical properties  soil microorganisms  Loess Plateau
Author NameAffiliation
SUN Xiao-hua Potato Research Institute of Gansu Academy of Agricultural Sciences, Lanzhou Gansu 730070 China 
HU Xin-yuan Gansu Academy of Agricultural Sciences, Lanzhou, Gansu 730070,China 
LU Li-yin Potato Research Institute of Gansu Academy of Agricultural Sciences, Lanzhou Gansu 730070 China 
XIE Kui-zhong Potato Research Institute of Gansu Academy of Agricultural Sciences, Lanzhou Gansu 730070 China 
ZHANG Wu Potato Research Institute of Gansu Academy of Agricultural Sciences, Lanzhou Gansu 730070 China 
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Abstract:
      In this paper,the soil of different continuous potato cropping years in the dry farming area of the Loess Plateau was studied by using space replacing time series method with the treatments including CK1, wheat/bean/horse rotation (CK2), continuous cropping for 2 years,continuous cropping for 4 years, and continuous cropping for 6 years. Soil bulk density and structure of different continuous cropping years were carried out by field sampling and laboratory analysis. The fractal dimension, total organic carbon, enzyme activity, and microbial number were studied. The results were as follows: (1) There were significant differences in soil bulk density among different treatments, and the soil bulk density of 6 years continuous cropping was the least. (2) Continuous cropping could change the proportion of aggregates different grain sizes in soil,and the content of soil grains > 4 mm was the highest in each treatment. (3) The long-term continuous potato cropping significantly reduced the soil organic carbon content and the soil total organic carbon. The 6-yrs cropping reduced total soil organic carbon by 14.27%. (4) The changes of soil invertase and catalase in the main growth period of potato showed “S” curve variation and the urease showed a “M”type trend. The activities of the 3 enzymes were significantly positively correlated with soil fertility factors, and negatively with the soil bulk density. (5) The bacteria in the soil were the dominant microorganism. Fungi and actinomycetes also accounted for a certain proportion; the number of bacteria, fungi, and actinomycetes in the 0~10 cm soil layer was significantly higher than that of 10~20 cm soil layer, and the long-term continuous cropping of potato significantly decreased the soil microbial population, and changed the community structure.
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