Afforestation with an age-sequence of Mongolian pine plantation promotes soil microbial residue accumulation in the Horqin Sandy Land, China

doi:10.1007/s40333-024-0011-5

Journal of Arid Land

2024, Vol. 16

Issue (4): 567-579 DOI: 10.1007/s40333-024-0011-5

Research article

Afforestation with an age-sequence of Mongolian pine plantation promotes soil microbial residue accumulation in the Horqin Sandy Land, China

GUO Jingwen¹^,², SONG Xueshu¹^,², WANG Xiao³, DU Zhangliu³, LU Sen¹^,²^,^*(

)

¹State Key Laboratory of Efficient Production of Forest Resources, Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China
²Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing 210037, China
³College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China

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Abstract

Land use change affects the balance of organic carbon (C) reserves and the global C cycle. Microbial residues are essential constituents of stable soil organic C (SOC). However, it remains unclear how microbial residue changes over time following afforestation. In this study, 16-, 23-, 52-, and 62-year-old Mongolian pine stands and 16-year-old cropland were studied in the Horqin Sandy Land, China. We analyzed changes in SOC, amino sugar content, and microbial parameters to assess how microbial communities influence soil C transformation and preservation. The results showed that SOC storage increased with stand age in the early stage of afforestation but remained unchanged at about 1.27−1.29 kg/m²after 52 a. Moreover, there were consistent increases in amino sugars and microbial residues with increasing stand age. As stand age increased from 16 to 62 a, soil pH decreased from 6.84 to 5.71, and the concentration of total amino sugars increased from 178.53 to 509.99 mg/kg. A significant negative correlation between soil pH and the concentration of specific and total amino sugars was observed, indicating that the effects of soil acidification promote amino sugar stabilization during afforestation. In contrast to the Mongolian pine plantation of the same age, the cropland accumulated more SOC and microbial residues because of fertilizer application. Across Mongolian pine plantation with different ages, there was no significant change in calculated contribution of bacterial or fungal residues to SOC, suggesting that fungi were consistently the dominant contributors to SOC with increasing time. Our results indicate that afforestation in the Horqin Sandy Land promotes efficient microbial growth and residue accumulation in SOC stocks and has a consistent positive impact on SOC persistence.

Key words： soil organic matter stand age biomarker amino sugars microbial residues

Received: 21 December 2023 Published: 30 April 2024

Corresponding Authors: ^*LU Sen (E-mail: asen205@cau.edu.cn)

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GUO Jingwen, SONG Xueshu, WANG Xiao, DU Zhangliu, LU Sen. Afforestation with an age-sequence of Mongolian pine plantation promotes soil microbial residue accumulation in the Horqin Sandy Land, China. Journal of Arid Land, 2024, 16(4): 567-579.

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http://jal.xjegi.com/10.1007/s40333-024-0011-5 OR http://jal.xjegi.com/Y2024/V16/I4/567

Table 1 Stand characteristics of Mongolian pine plantations with different ages

Table 2 Soil bulk density (BD), pH, soil organic carbon (SOC) concentration, and SOC storage at the 0-10 cm soil layer

Fig. 1 Concentrations of specific and total amino sugars under different land use patterns. (a), GluN (glucosamine); (b), GalN (galactosamine); (c), MurN (muramic acid); (d), total amino sugars. CL16 is the 16-year-old cropland; MP16, MP23, MP52, and MP62 are the 16-, 23-, 52-, and 62-year-old Mongolian pine plantations, respectively. Bars mean standard errors. Different lowercase letters represent significant differences among different land use patterns at P<0.050 level. The abbreviations are the same in the following figures.

Fig. 2 Microbial parameters under different land use patterns. (a), GluN/MurN (ratio of glucosamine to muramic acid); (b), GluN/GalN (ratio of glucosamine to galactosamine); (c), FRC/BRC (ratio of fungal residual C to bacterial residual C). Different lowercase letters represent significant differences among different land use patterns at P<0.050 level.

Fig. 3 Concentrations of microbial residual carbon (MRC) and their contributions to soil organic carbon (SOC) accumulation under different land use patterns. (a), BRC (bacterial residual carbon); (b), FRC (fungal residual carbon); (c), total MRC; (d), BRC/SOC; (e), FRC/SOC; (f), MRC/SOC. Different lowercase letters represent significant differences among different land use patterns at P<0.050 level.

Fig. 4 Correlations between soil pH and concentrations of specific and total amino sugars. (a), GluN (glucosamine); (b), GalN (galactosamine); (c), MurN (muramic acid); (d), total amino sugars.


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