Traditionally people use 15N fertilizers to trace the N in soil. For lab incubation without plants, priming means extra or less mineralization of soil native N (organic matter) within N treated soils compared to N mineralization in no-N soils. However, when plants present, the priming is the difference of the amount of N taken up by plants and the control (no-N) plants. This priming with plants, however, is not a real priming effect but a estimate of priming, as plants cannot take up all N mineralized in soil, so the remains of mineralized N may get lost via leaching, denitrification, etc. We know they are different but classical papers ( such asJenkinson, et al, 1985 SBB) always use plant N uptake as a proxy for priming or mineralization of soil native N (or organic matter). Can we compare the N priming results derived from plant N uptake and soil net N mineralization?
I'm not sure whether I got your question. Please have a look here. 'best! Jürgen
I am not sure if I understand the question either. Here is a recent review for C and N rhizosphere priming effects
Synthesis and modeling perspectives of rhizosphere priming.
Weixin Cheng, William J Parton, Miquel A Gonzalez-Meler, Richard Phillips, Shinichi Asao, Gordon G McNickle, Edward Brzostek, Julie D Jastrow
[Show abstract]
New Phytologist 2014
https://www.researchgate.net/publication/255972860_Synthesis_and_modeling_perspectives_of_rhizosphere_priming
Being at NAU, you should contact Dr Bruce Hungate's group with extensive research on soil N and priming.
Miquel
Article Synthesis and modeling perspectives of rhizosphere priming
Hi Xiao-Jun Allen Liu; Following links may be helpful to you
http://www.sciencedirect.com/science/article/pii/003807179090112D
http://onlinelibrary.wiley.com/doi/10.1111/j.1365-2389.1985.tb00348.x/abstract
http://www.nue.okstate.edu/Index_Publications/Arnall0002.pdf
Have nice time
Hi Allen,
Did you mean soil net N mineralization in the absence of plants? If that is the case, N priming results derived from plant N uptake can not be compared with soil net N mineralization, because the presence of plant roots (by their addition of extra C by rhizodeposition) can change the immobilization-mineralization turnover in soil appreciably. Let me know if I am correct.
Another point: Jenkinson et al (1985) used the term 'added N interaction' (ANI). I think this is the term they used for 'N priming'. ANI can be 'apparent' (resulted from pool substitution) or 'real' (resulting from plant roots exploring larger native soil N pool due to their larger root system in fertilized treatment compared with unfertilized treatment). Again, please let me know if I am correct.
Susantha
- Badges
- Science topic
- Similar topics
- Biological Science
- Biota
- Eukaryota
- Fungi