Stoichiometric and bacterial eco-physiological insights into microbial resource availability in karst regions affected by clipping-and-burning.

J Environ Manage

Jianshui Research Station, School of Soil and Water Conservation, Beijing Forestry University, Beijing, 100083, China; State Key Laboratory of Efficient Production of Forestry Resources, Beijing Forestry University, Beijing, 100083, China; Engineering Research Centre of Forestry Ecological Engineering, Ministry of Education, Beijing Forestry University, Beijing, 100083, China. Electronic address:

Published: November 2024

AI Article Synopsis

  • The study investigates how clipping-and-burning management practices affect soil microbial resource limitation (MRL) and the soil's carbon, nitrogen, and phosphorus (C:N:P) ratios, which are essential for nutrient cycling and carbon accumulation during vegetation restoration.
  • Results indicate that soil organic carbon (SOC), total nitrogen (TN), and total phosphorus (TP) significantly decrease with high-intensity and low-intensity fire treatments, while certain nutrient ratios increase in areas with clipping and fire compared to undisturbed soil.
  • The findings highlight the dynamic role of oligotrophic bacteria in regulating soil nutrient availability and suggest that MRL is closely tied to changes in soil C:N:P stoichiometry following disturbance from clipping-and-burning.

Article Abstract

Despite growing interest in soil microbial resource limitation (MRL), the impacts of clipping-and-burning on bacterial resource acquisition and its soil carbon, nitrogen, and phosphorous stoichiometry (C:N:P) remain unclear, yet are critical for nutrient cycling and SOC accumulation in vegetation restoration. We examined the soil C:N:P and eco-enzymatic stoichiometry, bacterial life-history strategies, and bacterial resource limitation under the influence of clipping-and-burning management practices: high-intensity fire (HIF), low-intensity fire (LIF), clipping-and-fire (CF), clipping (CP), and an undisturbed control (CK) in a Karst site in southwest China. The results showed that SOC, TN, and TP in HIF and LIF were significantly (p < 0.05) reduced (by 64%, 97%, and 99%) compared to CK. However, soil C:N, C:P, and N:P ratios were surprisingly higher (18.1, 56, and 3.08) in CF than in CK. The ratios of soil microbial biomass carbon (MBC) and nitrogen (MBN) were higher (4.8) under clipping. In contrast, their ratios with microbial biomass phosphorus (MBP) were observed to be higher (22.3 and 6.4) under high-intensity fire compared to CK. Moreover, results show that there is a higher percentage of species linked with oligotroph bacteria of Rickettsiales in CF treatments than CK. Soil bacterial communities in CF treatments exhibited co-limitation by C and P, whereas N limitation was more pronounced under low-intensity fire conditions. In conclusion, the evidence links MRL to soil C:N:P stoichiometry, underscoring the critical role of oligotrophic bacteria in mediating soil nutrient dynamics under clipping-and-burning disturbances. These findings improve our understanding of MRL over the Karst region under clipping-and-burning treatments, shedding light on its relationship with soil C:N:P, eco-enzymatic stoichiometry, and bacterial life-history strategies.

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http://dx.doi.org/10.1016/j.jenvman.2024.122925DOI Listing

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