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Flux of Root-Derived Carbon into the Nematode Micro-Food Web : A Comparison of Grassland and Agroforest

Title data

Hemmerling, Christin ; Li, Zhipeng ; Shi, Lingling ; Pausch, Johanna ; Ruess, Liliane:
Flux of Root-Derived Carbon into the Nematode Micro-Food Web : A Comparison of Grassland and Agroforest.
In: Agronomy. Vol. 12 (2022) Issue 4 . - 976.
ISSN 2073-4395

Abstract in another language

Carbon (C) cycling is crucial to agroecosystem functioning. Important determinants for the belowground C flow are soil food webs, with microorganisms and microfaunal grazers, i.e., nematodes, as key biota. The present study investigates the incorporation of plant-derived C into the nematode micro-food web under two different cropping systems, grassland (ryegrass (Lolium perenne L.) and white clover (Trifolium repens L.)) and agroforest (willow (Salix schwerinii Wolf and Salix viminalis L)). To quantify the C flux from the plant into the soil micro-food web, grass and willow were pulse-labeled with 13CO2 and the incorporation of 13C into the nematode trophic groups was monitored 3, 7, 14 and 28 days after labeling. The natural stable isotope signals (13C/12C, 15N/14N) were analyzed to determine the structure of the nematode micro-food web. The natural isotopic δ15N signal revealed different trophic levels for omnivores and predators in grassland and agroforest soils. The incorporation of plant C into nematode tissue was detectable three days after 13CO2 labeling with the highest and fastest C allocation in plant feeders in grassland, and in fungal feeders in agroforest soil. C flux dynamics between the aboveground vegetation and belowground micro-food web varied with cropping system. This demonstrates that crop-specific translocation of C affects the multitrophic interactions in the root environment, which in turn can alter soil nutrient cycling.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: C flux; root-derived C; plant type; agroforest; nematodes; micro-food web
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professor Agroecology > Professor Agroecology - Juniorprof. Dr. Johanna Pausch
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 500 Natural sciences
500 Science > 550 Earth sciences, geology
500 Science > 570 Life sciences, biology
Date Deposited: 17 Oct 2023 07:18
Last Modified: 17 Oct 2023 07:18