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Effects of land reclamation on the physical, chemical, and microbial quantity and enzyme activity properties of degraded agricultural soils

  • Le Qi
  • Peng Zhou
  • Laishu Yang
  • Ming GaoEmail author
Soils, Sec 5 • Soil and Landscape Ecology • Research Article
  • 41 Downloads

Abstract

Purpose

Land reclamation, as a measure of increasing cultivated land area, is being popularized in China in the past decades. However, the impact of land reclamation on soil carbon (C), nitrogen (N), and phosphorus (P) stoichiometry, microbial quantity, and enzyme activities has been rarely studied. The objective of this study was to know how land reclamation affected soil properties in agricultural soils.

Materials and methods

Soil samples were collected at 0–20, 20–40, and 40–60 cm depths before and after land reclamation of degraded soils in a village of southwest China. The samples were used to determine soil bulk density, porosity, moisture content, texture, pH, soil C, N, and P nutrient properties, microbial quantity, and enzyme activities in agricultural soils.

Results and discussion

The soil clay content was increased by 59.7%, while the soil organic matter (SOM), available phosphorus (AP), total potassium, microbial biomass carbon (MBC), microbial biomass nitrogen (MBN), and activities of catalase and urease enzymes were decreased by 49.9, 83.4, 32.8, 20.3, and 47.9%, respectively, at 0–20 cm of the soil. The decrease of SOM contributed to the decrease of MBC and MBN at 0–20 cm after the land reclamation. The soil texture had better capacity of water and fertilizer retention. Medium sand (> 0.25 mm) content, AP, the ratio of C to N, and activities of catalase were decreased, but pH and the ratio of N to P were increased at 20–40 and 40–60 cm. The clay content, medium silt (0.006–0.01 mm), total N, and quantity of fungi and actinomycetes were increased at 40–60 cm after the land reclamation.

Conclusions

Soil nutrient and enzyme activities at 0–20 cm were decreased but soil total microbial biomass was not disturbed at 0–20, 20–40, and 40–60 cm depths, after the land reclamation. The decrease of soil organic matter at 0–20 cm contributed to the decrease of MBC and MBN affected by land reclamation activities. Therefore, topsoil requires better management to preserve soil nutrients and enzyme activities after land reclamation.

Keywords

Land consolidation Microbial biomass Soil ecological stoichiometry Soil nutrient Soil texture 

Notes

Acknowledgments

We would like to thank Dr. Xinhua He and Dr. Chengsheng Ni for their constructive help during the manuscript writing. We would also like to thank anonymous reviewers and editors for their valuable suggestions and time that helped to substantially improve the manuscript. This study was supported by the Chongqing Postgraduate Research and Innovation Project (No. CYB18091), the National “Five-Year” Key Research and Development Program (2017YFD0800101), and the National Innovation Training Program (201910635077).

Supplementary material

11368_2019_2432_MOESM1_ESM.docx (129 kb)
ESM 1 (DOCX 129 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Resources and EnvironmentSouthwest UniversityChongqingChina
  2. 2.College of Resources and EnvironmentSouthwest UniversityBeibeiChina

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