+ Site Statistics
+ Resolve Accession
+ Subscribe to Site Feeds
EurekaMag Most Shared ContentMost Shared
EurekaMag PDF Full Text ContentPDF Full Text
+ PDF Full Text
Request PDF Full TextRequest PDF Full Text
Submit PDF Full TextSubmit PDF Full Text
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter
Follow on Google+Follow on Google+
Follow on LinkedInFollow on LinkedIn

+ Translate

Effect of extracellular-enzyme activities on solubilization rate of soil organic nitrogen

, : Effect of extracellular-enzyme activities on solubilization rate of soil organic nitrogen. Biology & Fertility of Soils 17(1): 32-38

In a sandy soil containing 15N-labeled active (soluble and easily degradable) and non-labelled passive (recalcitrant) fractions of soil organic matter, the rate of net N mineralization (solubilization) was determined during a 55-day incubation at 25 degree C, 63% water-holding capacity and different levels of soil extracellular-enzyme activities. The active fraction of soil N was labelled by preincubation (at 5 degree C and 74% water-holding capacity for 6 months) of soil amended with 15 N-labeled plant material. Increases in the activity of extracellular-enzymes in soil were induced by the addition of glucose and KH-2PO-4 at the beginning of the incubation. The results show that the contents of total soluble N (NO-3--N + NH-4+-N + soluble organic N) were significantly higher in glucose-amended soil compared to the unamended soil. The increases in soluble N in soil amended with 1 and 2 mg glucose g-1 dry soil corresponded to a mean rate of net solubilization of 7.9 +- 1.4 and 18.8 +- 0.7 nmol N g-1 dry soil day-1, respectively. The mean rate of net N solubilization (3.6 +- 1.0 nmol N g-1 dry soil day-1) in unamended soil was significantly lower than those of glucose amended soils. The content of 15N in total soluble N in soil amended with 2 mg glucose, for example, was diluted from 3.11 +- 0.08 atom% before the incubation to 2.77 +- 0.03 atom% after 55 days. This indicates that 89% of soluble-N accumulated in soil by the end of the incubation originated from the active fraction of soil N and the rest, estimated at 11%, originated from the passive fraction. The activities of soluble and total proteases as well as the rate of N solubilization in the soil increased with the application of glucose. The activity of these extracellular enzymes was highly correlated with the rates of net N solubilization. Thus, increases in extracellular-enzyme activities in glucose-amended soils had a priming effect on the solubilization of 15N-labeled active and non-labeled passive fractions of soil organic N. It seems that the activity of extracellular-enzymes expressed in terms of total and soluble protease activities could be a rate-limiting factor in the processes of soil organic N solubilization.

Order PDF Full Text


Click here to order any other PDF Full Text

Accession: 002355554

DOI: 10.1007/bf00418669

PDF Full Text: Effect of extracellular-enzyme activities on solubilization rate of soil organic nitrogen

Submit PDF Full Text

No spam - Every submission is manually reviewed

Due to poor quality, we do not accept files from Researchgate

Submitted PDF Full Texts will always be free for everyone
(We only charge for PDFs that we need to acquire)

Select a PDF file:

Other references

Jiang, J-Guo.; Zhao, Z-Zhen.; Du, X-Juan.; Sui, J-Chao.; Wu, S-Yao., 2007: Experimental investigation of the straw pre-treatment to enhance its high solid anaerobic digestion. The straw contains a high content of lignin, which cannot be well utilized by anaerobic bacteria in high solid anaerobic digestion process. This paper presents the experimental investigation of the straw pre-treatment, which aims to destroy the c...

Benefield, L.E., 1979: Cues that trigger participation in health screening. American Journal of Nursing 79(9): 1573-1573

Shibata, M.; Nezu, T.; Takekawa, M.; Ando, K., 1997: Decreased production of IL-12 by PBMC and type 2 helper T cells -dominant status in advanced cancer patients. International Journal of Oncology 11(SUPPL ): 896

Jourdan, M.; Glock, C.; Margen, S.; Bradfield, R.B., 1980: Sulphate, acid-base, and mineral balances of obese women during weight loss. Four obese women, each at least 50% above their expected weight for height were maintained in the metabolic unit for 63 days on liquid formula diets of differing protein and calorie content. We made the following findings: 1) When 12 g protein nit...

Raljević, E.; Popadić, M.; Sosić, M.; Budalica, M., 1975: Total atrio-ventricular block treated through the implantation of an electric stimulator. Medicinski Arhiv 29(1): 39-42

Abshire, S.G.; Dement, L.N.; Ferrante, W.A.; Hines, C., 1979: Cimetidine in the treatment of esophagitis associated with autoimmune diseases. Journal of the Louisiana State Medical Society 131(2): 45-47

Maas, S., 2012: Base modification RNA editing: information recoding on the fly. Seminars in Cell & Developmental Biology 23(3): 243-243

Bray, MP., 1984: An evaluation of heron and egret marsh nesting habitat and possible effects of burning. Murrelet, 652: 57-59

Anonymous, 1973: Shift of the population composition toward the aged and the resultant changes in welfare policy. Japanese Journal for Public Health Nurse 29(3): 196-197

Whitaker, R.; Whitaker, Z., 1978: Notes on Phelsuma andamanense, the Andaman day gecko or green gecko. Journal of the Bombay Natural History Society, 752: 497-499