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[1]YANG Cuiping,MA Yonggang.Kinetic Characteristics of Urease in Alar Reclamation Region of the Upper Reaches of Tarim River[J].Research of Soil and Water Conservation,2018,25(02):131-136.

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Kinetic Characteristics of Urease in Alar Reclamation Region of the Upper Reaches of Tarim River

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 02 Page number: 131-136 Column: Public date: 2018-04-03

Title:: Kinetic Characteristics of Urease in Alar Reclamation Region of the Upper Reaches of Tarim River

Author(s):: YANG Cuiping¹, MA Yonggang^2,3; 1. Xinjiang Scientific and Technological Development Strategy Institute, Urumqi 830011, China;
2. College of Resources and Environmental Science, Xinjiang University, Urumqi 830046, China;
3. Key Laboratory of Oasis Ecology, Ministry of Education, Urumqi 830046, China

Keywords:: Alar reclamation area; continuous cropping cotton field; urease activity; urease kinetics

CLC:: S154

DOI:: -

Abstract:: The study of changes in soil enzyme characteristics is important for exploring the effects of human activities on soil ecosystems. In this paper, we studied the soil urease activity, kinetics and soil physical and chemical factors in different soil layers of cotton fields in continuous cropping years in four different cropping years. The relationship between soil enzyme kinetics and its physicochemical factors was studied. The results showed that the urease activity of cotton field decreased gradually with the depth of soil in different continuous cropping years; with the increase of continuous cropping time, the urease activity of 0-20 cm soil layer decreased first and then increased, and the changes in the layers of 20-50 cm and 50-80 cm increased first and then increased; the soil urease activity of cotton field in four different years was decreased in the order:20 years > 15 years > 10 years > 5 years, the general trend of enzymatic reaction of urease in cotton field increased with the increase of substrate concentration; the V_max and V_max/K_m values in the cotton field of 5 years, 10 years, 15 years, and 20 years showed the tendency of first increasing and then decreasing with the increase of the annual life, while the K_m value showed the decrease of urease and substrate binding with the increase of the continuous cropping period; the correlation analysis showed that V_max was positively correlated with available phosphorus and soil water content, negatively correlated with electric conductivity, K_m had little correlation with soil physical and chemical factors, and V_max/K_m had a positive correlation with available phosphorus, soil water content and pH value. Soil enzyme kinetics characteristics are affected by available phosphorus, soil water content, pH value and electric conductivity.

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