[1]SUN Zhengguo.Soil Enzyme Activity and Microbial Diversity in Rhizosphere of Continuous Watermelon Cropping[J].Research of Soil and Water Conservation,2015,22(05):46-51,57.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
22
Number of periods:
2015 05
Page number:
46-51,57
Column:
Public date:
2015-10-28
- Title:
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Soil Enzyme Activity and Microbial Diversity in Rhizosphere of Continuous Watermelon Cropping
- Author(s):
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SUN Zhengguo
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Nantong Agricultural College, Nantong, Jiangsu 226007, China
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- Keywords:
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continuous cropping; watermelon; soil nutrients; soil enzyme activity; rhizoshpere microorganisms
- CLC:
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S154.3
- DOI:
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- Abstract:
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In order to improve the cultivation quality and provide reference for the high yield and excellent quantity and sustainable development of watermelon, the roots and rhizosphere soils with watermelone growths of 0, 3, 9 and 15 years which were marked as CK, CP3, CP9 and CP15 were collected in Dapeng watermelon base in Shandong Province. Root activity, soil nutrients, soil enzyme activity and rhizosphere microorganisms were measured, and correlation analysis between them was carried out. It turned out that soil organic matter and the contents of nitrogen, phosphorus and potassium were decreasing and nutrients were losing with the duration of continuous cropping, the lowest was found in fifteen year of continuous cropping. At the same growth period, active absorption area and total absorption area of watermelon roots reduced respectively in long term continuous cropping. Rhizosphere soil enzyme activity showed a trend with the increase at first and decline later, and the activity was high in thefruiting period. Soil culturable microbial metabolic activity increased at the early stage of the continuous cropping, microbial metabolic activity reduced at the late stage, and the longer continuous cropping was, the less soil microbial community diversity was, evenness increased at first and reduced later. Correlation analysis showed that the soil catalase (p < 0.05), phosphatase (p < 0.05), sucrase (p < 0.01) and available phosphorus (p < 0.05), and available potassium (p < 0.05) had the positive correlation with the fungus. Urease had a positive correlation with the bacteria (p < 0.01), was negatively related to the alkali solution nitrogen (p < 0.01); catalase (p < 0.05), alkali solution nitrogen (p < 0.01) and actinomycetes had significant positive correlation. To sum up, a few years before continuous cropping, microbal metabolisms and enzyme activity had increased, continuous cropping obstacles did not occur. After 9 years, soil nutrient loss was serious, microbal metabolisms and enzyme activity significantly reduced, continuous cropping obstacles occurred. Reducing the time of continuous cropping could improve high yield and excellent quantity and sustainable development of watermelon, conversely affected the growth of watermelon, and lowered the economic benefits.