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Background and aims <p>The <i>Mimosa</i> species (Leguminosae) promote soil fertility and restoration; however, their impact on soil C and N cycling have never been assessed, and even neither with respect to their topographic positions at semiarid ecosystems. Our objective was to examine seasonal variation of the effect of three <i>Mimosa</i> species on soil C and N dynamics, including <i>M. luisana</i> at two contrasting topographic positions.</p> Methods <p>We measured the total and available forms of soil C and N, microbial biomass, and net mineralisation and nitrification rates in soils collected under the canopies of <i>M. texana</i> var. <i>filipes</i>, <i>M. polyantha</i>, <i>M. luisana</i>, and in open areas at plain sites, as well as under the canopy of <i>M. luisana</i> and open areas at plain vs. hillslope sites, during the dry, early-rainy and rainy seasons.</p> Results <p>At plain sites, the three <i>Mimosa</i> species contributed with higher litter mass and quality, and 1.5 to 2 times more soil C and N concentrations under their canopies. The soil under <i>Mimosa</i> species had the double or more microbial biomass, labile C, inorganic N as well as faster C and N mineralisation and nitrification rates than open areas. Soil N mineralisation and nitrification rates varied with rainfall seasonality, having a peak during the rains that ranged from 54 to 202&#xa0;µg N g<sup>−1</sup> and 14 to 180&#xa0;µg NO<sub>3</sub> g<sup>−1</sup>, respectively among <i>Mimosa</i> species. <i>Mimosa luisana</i> affected soil C and N dynamics similarly at plain or hillslope sites.</p> Conclusions <p>The three <i>Mimosa</i> species not only form resource islands but also fertility islands, which couple soil C and N dynamics, acting as sources or sinks of these nutrients depending on rainfall seasonality. Moreover, <i>M. luisana</i> drives soil C and N cycling that may be magnified by the topography. In turn, <i>Mimosa</i> (legumes)-topography interaction should be included in spatial and temporal heterogeneity models of soil resources in semiarid ecosystems.</p>

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Mimosa species (Leguminosae) and rainfall seasonality affect spatial dynamics of soil carbon and nitrogen in a semiarid ecosystem

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  • 发表日期：

    2025年11月25日

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  • Noé Manuel Montaño,
  • Sara Lucía Camargo-Ricalde,
  • Susana Adriana Montaño-Arias,
  • Arturo Jiménez-Martínez

摘要

Background and aims

The Mimosa species (Leguminosae) promote soil fertility and restoration; however, their impact on soil C and N cycling have never been assessed, and even neither with respect to their topographic positions at semiarid ecosystems. Our objective was to examine seasonal variation of the effect of three Mimosa species on soil C and N dynamics, including M. luisana at two contrasting topographic positions.

Methods

We measured the total and available forms of soil C and N, microbial biomass, and net mineralisation and nitrification rates in soils collected under the canopies of M. texana var. filipes, M. polyantha, M. luisana, and in open areas at plain sites, as well as under the canopy of M. luisana and open areas at plain vs. hillslope sites, during the dry, early-rainy and rainy seasons.

Results

At plain sites, the three Mimosa species contributed with higher litter mass and quality, and 1.5 to 2 times more soil C and N concentrations under their canopies. The soil under Mimosa species had the double or more microbial biomass, labile C, inorganic N as well as faster C and N mineralisation and nitrification rates than open areas. Soil N mineralisation and nitrification rates varied with rainfall seasonality, having a peak during the rains that ranged from 54 to 202 µg N g−1 and 14 to 180 µg NO3 g−1, respectively among Mimosa species. Mimosa luisana affected soil C and N dynamics similarly at plain or hillslope sites.

Conclusions

The three Mimosa species not only form resource islands but also fertility islands, which couple soil C and N dynamics, acting as sources or sinks of these nutrients depending on rainfall seasonality. Moreover, M. luisana drives soil C and N cycling that may be magnified by the topography. In turn, Mimosa (legumes)-topography interaction should be included in spatial and temporal heterogeneity models of soil resources in semiarid ecosystems.