 |
| Titel |
Plant inter-species effects on rhizosphere priming effect and nitrogen acquisition by plants |
| VerfasserIn |
Yue Sun, Xingliang Xu, Baijie Yang, Yakov Kuzyakov |
| Konferenz |
EGU General Assembly 2015
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 17 (2015) |
| Datensatznummer |
250103123
|
| Publikation (Nr.) |
 EGU/EGU2015-2524.pdf |
|
|
|
|
|
| Zusammenfassung |
| Rhizosphere interactions play a central role linking roots-soil system and regulate various
aspects of nutrient cycling. Rhizodeposition inputs are known to change soil organic matter
(SOM) decomposition via rhizosphere priming effects (RPEs) through enhancing soil
biological activity and altering microbial community structure. The magnitude of RPEs varies
widely among plant-species and root biomass possibly due to different quality and quantity of
rhizodeposits. However, it is virtually unknown whether the RPEs are influenced by plant
inter-species interactions and how these processes affect N mineralization and available N for
plants.
Monocultures of maize (M) and soybean (S), and mixed cultures of maize/maize (MM),
soybean/soybean (SS), maize/soybean (MS) were grown over a 45-day greenhouse
experiment. We labeled them with plant litter that was enriched in13C and 15N. The 15N
distributions in plants and microbial biomass were measured at 14, 35, and 45days after
labeling.
The RPEs were positive under all plants, ranging from 11.7% to 138.3% and gradually
decreased with plant growth. The RPE in the SS was significantly higher than these in others
treatments at 14 days, while at 45 days it was higher in the MS than these from their
monocultures, suggesting that the RPE was enhanced by the inter-species effects of
maize and soybean. The litter decomposition ratio and 15N recovery of plants and
microorganism increased with the root growth across all plants. The 15N recovery of plants in
the MS (14.2%) was higher than these in the MM (12.3%) and SS(9.7%) at 45
days. Similarly, the 15N recovery of microorganism in the corresponding treatments
was 6.7%, 2.2%, and 6.8%, respectively. The MS showed higher soil organic N
mineralization amount than that from all soybean and maize monocultures at 45 days.
We conclude that plant inter-species interactions may have significant effect on
rhizosphere priming and modify the plant N uptake from litter resource and SOM. |
|
|
|
|
|
|