[1]Zhang Yanwen,Zhou Yajie,Zhang Buran,et al.Soli Enzymatic Stoichiometry and Nutrient Limitation During Revegetation in Sand-Fixing Forest[J].Research of Soil and Water Conservation,2023,30(06):102-111.[doi:10.13869/j.cnki.rswc.2023.06.050]
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Soli Enzymatic Stoichiometry and Nutrient Limitation During Revegetation in Sand-Fixing Forest
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
30
Number of periods:
2023 06
Page number:
102-111
Column:
Public date:
2023-10-10
- Title:
- Soli Enzymatic Stoichiometry and Nutrient Limitation During Revegetation in Sand-Fixing Forest
- Keywords:
- extracellular enzyme activity; ecological enzyme stoichiometric; nutrient limitation; sand-fixation forest; Mu Us sandy land
- CLC:
- S714
- DOI:
- 10.13869/j.cnki.rswc.2023.06.050
- Abstract:
- [Objective] This study was conducted to explore the response of soil extracellular enzymes and enzyme stoichiometric ratios to the revegetation process of desertified land and their nutrient limitation effects, which can provide insight into the nutrient conversion capacity and mechanism of the revegetation process of artificial sand-fixation forest. [Methods] Based on time-space substitution, the semi-fixed sandy land was sampled as 0 years control site, and the shrub and arbor sand-fixing forests with chronosequences of 25～56 years revegetation in Mu Us Sandy Land of Yulin were chosen. The evolution characteristics of enzyme activity and its stoichiometry, and resource limitation on microbial nutrient requirement in both 0—10 cm and 10—20 cm soil layers were analyzed. [Results] The activity of β-glucosidase(BG), β-1,4-acetaminoglucosidase(NAG), leucine aminopeptidase(LAP)and alkaline phosphatase(AP)in both soil layers under two forest lands increased continuously with year increase of vegetation restoration. However, unbalanced changes among the enzyme activities resulted in significant increase in soli enzymatic stoichiometry. The ratios of C:N, C:P and N:P calculated based on enzyme activity showed the increasing trend during 56 years of revegetation in both forest lands. And, significant increase in soli enzymatic stoichiometry reflected that microbial growth was limited by nitrogen(N)rather than phosphorus(P). Resource limitation by P only was observed in 10—20 cm soil layer in arbor land with 25 years of revegetation. [Conclusion] Revegetation in sand-fixing forest improved the enzyme activities and enhanced transformation of carbon and nitrogen in soil, and soil microbial activity was mainly limited by N nutrient during the vegetation restoration process.
- References:
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Last Update:
2023-10-10