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[1]KONG Weibo,SHI Yun,YAO Yufei,et al.Characteristics of Enzyme Activity, Carbon and Nitrogen Mineralization of Soil in the Abandoned Sloping Cropland in Wind-Water Erosion Crisscross Region[J].Research of Soil and Water Conservation,2019,26(02):1-8,16.

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Characteristics of Enzyme Activity, Carbon and Nitrogen Mineralization of Soil in the Abandoned Sloping Cropland in Wind-Water Erosion Crisscross Region

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 02 Page number: 1-8,16 Column: Public date: 2019-04-28

Title:: Characteristics of Enzyme Activity, Carbon and Nitrogen Mineralization of Soil in the Abandoned Sloping Cropland in Wind-Water Erosion Crisscross Region

Author(s):: KONG Weibo^1,4, SHI Yun², YAO Yufei^1,4, SHAO Mingan^1,3, WEI Xiaorong^1,3; 1. Research Center of Soil and Water Conservation and Ecological Environment, Ministry of Education and Chinese Academy of Sciences, Yangling, Shaanxi 712100, China;
2. Agricultural Technology Center, Dingbian, Shaanxi 718600, China;
3. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Northwest A & F University, Yangling, Shaanxi 712100, China;
4. University of Chinese Academy of Sciences, Beijing 100049, China

Keywords:: water-wind erosion crisscross region; abandoned grassland; soil enzyme activity; carbon and nitrogen mineralization; spatial autocorrelation

CLC:: S812.2

DOI:: -

Abstract:: We analyzed soil enzyme activities, carbon and nitrogen mineralization and their spatial distribution characteristics at different succession stages (Stipa bungeana and Medicago sativa—Artemisia sacrorum) of abandoned slope lands in wind-water erosion crisscross region. The results showed that: (1) soil organic carbon, total nitrogen and phosphorus contents were not affected by slope position (except for total phosphorus in M. sativa—A. sacrorum slope land), and the contents of soil organic carbon (on upper, middle and lower slope) and total nitrogen (on middle and lower slope) were significantly higher in S. bungeana slope land than those in M. sativa—A. sacrorum slope land. (2) Soil urease and amylase activities increased significantly but no significant difference in sucrase and alkaline phosphatase activities in S. bungeana slope land was observed, and no significant difference in activities of soil urease and amylase was found but soil sucrase enzyme activity decreased significantly in M. sativa—A. sacrorum slope land from upper to lower slope position; the effect of grassland type on soil urease and sucrase enzyme activities was related to slope position, but effect of grassland type soil alkaline phosphatase activity was not related to slope position; (3) soil carbon mineralization and the rate constant of mineralization were significantly higher in S. bungeana slope land than those in M. sativa—A. sacrorum slope land and not affected by slope position. Nitrification dominated the mineralization in both slope lands; soil nitrification and mineralization increased significantly from upper to lower slope in S. bungeana slope land, while the opposite trend was observed in M. sativa—A. sacrorum slope land; (4) with the succession from M. sativa—A. sacrorum to S. bungeana stage, the spatial autocorrelation of soil sucrase and alkaline phosphatase activities and soil carbon and nitrogen mineralization index increased, while spatial autocorrelation of soil urease and amylase activities decreased, but a strong spatial autocorrelation still existed. These results indicate that the effects of grassland types or succession stages should be considered in assessing the soil biogeochemical processes and their spatial distribution of abandoned lands.

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