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Distribution patterns of typical enzyme activities in tundra soils on the Fildes Peninsula of maritime Antarctica

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【作者】 DING WeiWANG QingZHU RenbinMA Dawei

【Author】 DING Wei;WANG Qing;ZHU Renbin;MA Dawei;Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of China;

【机构】 Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of China

【摘要】 Soil enzyme activities can be used as indicators of microbial activity and soil fertility. In this paper, the activities of invertase(IA), phosphatase(PA) and urease(UA) were investigated in tundra soils collected from marine animal colonies, areas of human activity and background areas on Fildes Peninsula, maritime Antarctica. Soil enzyme activities were in the range of 1.0–82.7 mg·kg-1·h-1 for IA, 0.2–8.2 mg·kg-1·h-1 for PA and 0.2–39.8 mg·kg-1·h-1 for UA. The spatial distribution patterns for soil enzyme activities corresponded strongly with marine animal activity and human activity. Significantly higher soil IA and PA activities occurred in penguin colony soils, whereas seal colony soils showed higher UA activity. Statistical analysis indicated that soil IA activity was controlled by the levels of soil nutrients(TOC, TN and TP), PA activity was closely related with TP, and UA activity was affected by the soil p H. Overall, the deposition amount of penguin guano or seal excreta could impact the distribution of enzyme activity in Antarctic tundra soils. Multiple stepwise regression models were established between the enzyme activities, soil physicochemical properties and heavy metals Cu and Zn([IA]=0.7[TP]–0.2[Cu]+22.3[TN]+15.1, [PA]=0.3[TP]+0.03[Mc]+0.2, [UA]=16.7[p H]–0.5[Cu]+ 0.4[Zn]–72.6). These models could be used to predict enzyme activities in the tundra soils, which could be helpful to study the effects of marine animal activity and environmental change on tundra ecosystems in maritime Antarctica.

【基金】 supported by the National Natural Science Foundation of China (Grant nos. 41176171 and 41076124);the Specialized Research Fund for the Doctoral Program of Higher Education (Grant no. 20123402110026)
【所属期刊栏目】 Articles (2015年01期)
  • 【DOI】10.13679/j.advps.2015.1.00038
  • 【分类号】S154.2
  • 【下载频次】11
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