文献类型： 外文期刊

作者： Zheng, H. ¹ ; Guber, A. K. ² ; Kuzyakov, Y. ⁴ ; Zhang, W. ⁶ ; Kravchenko, A. N. ² ;

作者机构： 1.Jilin Acad Agr Sci, Res Inst Agr Resources & Environm, Changchun 130033, Peoples R China

2.Michigan State Univ, Dept Plant Soil & Microbial Sci, E Lansing, MI 48824 USA

3.Michigan State Univ, DOE Great Lakes Bioenergy Res Ctr, E Lansing, MI 48824 USA

4.Univ Gottingen, Dept Agr Soil Sci, Gottingen, Germany

5.RUDN Univ, Moscow, Russia

6.Inner Mongolia Normal Univ, Coll Geog Sci, Hohhot 010022, Inner Mongolia, Peoples R China

关键词： X-ray computed micro-tomography; (CO2)-C-13 pulse labeling; Prairie; Switchgrass; Big bluestem; Wild bergamot; Pore-size distribution; Soil pore architecture; Soil pore structure; Plant neighbor identity

期刊名称：GEODERMA （ 影响因子：7.422； 五年影响因子：7.444 ）

ISSN： 0016-7061

年卷期： 2022 年 407 卷

页码：

收录情况： SCI

摘要： Greater plant diversity is known to facilitate soil C gains, yet the exact mechanisms of this effect are still under intensive discussion. Whether a plant grows in monoculture or in a multi-species mixture can affect allocation of plant assimilates, belowground exudation, and microbial stimulation. The goal of this study was to examine the effects of inter-cropping on a previously overlooked aspect of plant-soil interactions, namely, on locations where plant assimilated C is allocated within the soil pore system and its subsequent fate in relation to soil pore size distributions. The soil for the study originated from a greenhouse experiment with switchgrass (Panicum virgatum L.) (var. Cave'n'Rock) (SW), big bluestem (Andropogon gerardii Vitman) (BB), and wild bergamot (Monarda fistulosa L.) (WB) grown in monocultures and in inter-cropped pairs and subjected to species specific 13C pulse labeling (Kravchenko et al., 2021). Intact soil cores (8 mm 0) were collected from the experimental pots, subjected to a short-term (10 day) incubation, X-ray computed micro-tomography (mu CT) scanning, and soil 13C micro-sampling "geo-referenced" to mu CT images. Results indicated that in the plant systems with demonstrated interplant C transfer soil 13C was positively correlated with < 10 mu m 0 pores immediately after plant termination and with 20-80 mu m 0 pores after the incubation. In the systems without marked interplant C transfer soil, 13C was positively correlated with 20-30 mu m 0 pores, however, the correlations disappeared after the incubation. Soils from the systems with demonstrated belowground C transfer displayed lower losses of root-derived C during incubation than the systems where interplant C transfer was negligible. Factors facilitating interplant C transfer appear to also lead to placement of root-derived C into smaller pores and to its greater protection there.