Effects of tree species and topography on soil and microbial biomass stoichiometry in Funiu Mountain, China.

IF 2.2 2区环境科学与生态学 Q1 Agricultural and Biological Sciences BMC Ecology Pub Date : 2020-12-09 DOI:10.1186/s12898-020-00332-4

Yaowu Tian, Dong Qiao, Shaojun Xu, Ning Wang

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Abstract

Background: Soil and microbial biomass stoichiometry plays an important role in understanding nutrient cycling in terrestrial ecosystems. However, studies on soil and microbial biomass stoichiometry in forests are rare. This study investigated the effect of tree species and topographic factors on the ecological stoichiometry of soil and soil microbial biomass.

Methods: Three types of forest stands (Quercus variabilis, Larix principis-ruprechtii, and Cotinus coggygria Scop.) in the Beiru River basin of Funiu Mountain were analyzed in September 2018. Six slope positions (sunny bottom slope, sunny middle slope, sunny top slope, shady bottom slope, shady middle slope, and shady top slope) were selected, and the total number of sampling plots was 108. The stoichiometric indices of soil and microbial biomass were determined.

Results: At a depth of 0-10 cm, the soil organic C contents in different stands followed the order of C. coggygria (27.7 ± 5.2 g/kg) > Q. variabilis (24.5 ± 4.9 g/kg) > L. principis-ruprechtii (20.8 ± 4.3 g/kg) (P < 0.05). The soil organic C contents at depths of 0-10 cm with different slope aspects and at different slope positions also showed significant differences (P < 0.05). The highest MBC content was observed at the slope bottom (1002 ± 157 mg/kg), whereas the lowest was observed at the slope top (641 ± 98.3 mg/kg). Redundancy analysis showed that the contribution of tree species to these differences was 57.1%, whereas that of topographical factors was 36.2%.

Conclusions: Tree species more significantly affected soil nutrients and microbial biomass C, N and P than did topographic factors.

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树种和地形对中国伏牛山土壤和微生物生物量平衡的影响

背景：土壤和微生物生物量的化学计量对了解陆地生态系统的养分循环起着重要作用。然而，有关森林中土壤和微生物生物量生物力学的研究却很少见。本研究调查了树种和地形因素对土壤和土壤微生物生物量生态平衡的影响：2018年9月，分析了伏牛山北汝河流域的三种林分（Quercus variabilis、Larix principis-ruprechtii和Cotinus coggygria Scop.）。选取了6个坡位（阳坡底、阳坡中、阳坡顶、阴坡底、阴坡中、阴坡顶），采样小区总数为108个。测定了土壤和微生物生物量的化学计量指数：结果：在 0-10 厘米深度，不同树种的土壤有机碳含量依次为 C. coggygria（27.7 ± 5.2 g/kg）> Q. variabilis（24.5 ± 4.9 g/kg）> L. principis-ruprechtii（20.8 ± 4.3 g/kg）（P 结论）：与地形因素相比，树种对土壤养分和微生物生物量 C、N 和 P 的影响更大。

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来源期刊

BMC Ecology ECOLOGY-

CiteScore

5.80

自引率

4.50%

发文量

审稿时长

22 weeks

期刊介绍： BMC Ecology is an open access, peer-reviewed journal that considers articles on environmental, behavioral and population ecology as well as biodiversity of plants, animals and microbes.