Even flow? Changes of carbon and nitrogen release from pea roots over time
Even flow? Changes of carbon and nitrogen release from pea roots over time
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DOI：
10.1007/s11104-018-3753-z
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发表时间：
2018-10-01
期刊：
影响因子：
4.9
通讯作者：
Wichern, Florian
中科院分区：
文献类型：
--
作者：
Hupe, Anke;Schulz, Hannes;Wichern, Florian
土壤养分动态受根-微生物相互作用和植物发育的影响。研究了植物生长阶段和丛枝菌根真菌（AMF）对碳(C)和氮(N)根沉积及向微生物生物量（MB）转移的影响。有（Frisson）和没有菌根（P2）的豌豆品种（Pisum sativum L.）在播种后45、63、71和95天进行c -13- n -15标记和收获。测定植物间和土壤间菌根化、MB、总C、总N、总C-13、总N-15，计算根沉积C和N （CdfR, NdfR）。总CdfR增加到豌豆成熟，NdfR增加到开花结束。随着时间的推移，它们的相对贡献逐渐减少，在收获时占植株总碳氮的4-10%。根沉积对MB C和N的贡献在1%至6%之间，尽管在MB中发现了20%的根沉积。Frisson比P2释放更多的NdfR，但由于生物量分配的差异，无法准确估计AMF对C和N的影响。CdfR遵循从早期生长到衰老的均匀流动。开花后NdfR停止流动可能是由于植物内氮的重新安置。在我们的研究中，根沉积物对MB的贡献很小。
Soil nutrient dynamics are affected by root-microbe interactions and plant development. We investigated the influence of plant growth stage and arbuscular mycorrhiza fungi (AMF) on carbon (C) and nitrogen (N) rhizodeposition and the transfer into the microbial biomass (MB).Pea varieties (Pisum sativum L.) with (Frisson) and without mycorrhiza (P2) were C-13-N-15-labelled and harvested at 45, 63, 71, and 95 days after sowing. Mycorrhization, MB, total C, N, C-13, N-15 were determined in plant and soil compartments to calculate C and N derived from rhizodeposition (CdfR, NdfR).Total CdfR increased until pea maturity, NdfR until end of flowering. Their relative contribution steadily decreased over time, accounting for 4-10% of total plant C and N at harvest. Rhizodeposition contributed between 1 and 6% to MB C and N, although 20% of the rhizodeposits were discovered in the MB. Frisson released more NdfR than P2 but it was not possible to accurately estimate AMF effects on C and N due to differences in biomass partitioning.CdfR followed an even flow from early growth until senescence. NdfR flow ceased after flowering possibly due to N relocation within the plant. Rhizodeposits contribute very little to MB in our study.