Effect of Zeolite on the Decomposition Resistance of Organic Matter in Tropical Soils under Global Warming
Global temperature had increased by about 0.5oC over
the past century, increasing temperature leads to a loss or a decrease
of soil organic matter (SOM). Whereas soil organic matter in many
tropical soils is less stable than that of temperate soils, and it will be
easily affected by climate change. Therefore, conservation of soil
organic matter is urgent issue nowadays. This paper presents the
effect of different doses (5%, 15%) of Ca-type zeolite in conjunction
with organic manure, applied to soil samples from Philippines,
Paraguay and Japan, on the decomposition resistance of soil organic
matter under high temperature. Results showed that a remain or
slightly increase the C/N ratio of soil. There are an increase in
percent of humic acid (PQ) that extracted with Na4P2O7. A decrease
of percent of free humus (fH) after incubation was determined. A
larger the relative color intensity (RF) value and a lower the color
coefficient (6logK) value following increasing zeolite rates leading
to a higher degrees of humification. The increase in the aromatic
condensation of humic acid (HA) after incubation, as indicates by the
decrease of H/C and O/C ratios of HA. This finding indicates that the
use of zeolite could be beneficial with respect to SOM conservation
under global warming condition.
 Barancikov├í, G., N. Senesi and G. Brunetti. "Chemical and
spectroscopic characterization of humic acids isolated from different
Slovak soil type,." Geoderma, 78: 251-266, 1997.
 Colella C.. "Ion exchange equilibria in zeolite minerals," Mineralium
Deposita, 31: 554-562, 1996.
 Gonzales-Vila, F.J., F. Martin, C. Del Rioj and R. Frund. " Structure
characteristics and geochemical significance of humic acids isolated
from three Spanish lignite deposit," Science of The Total
Environmental, 117-118: 335-343, 1992.
 Kumada K.. " Chemistry of Soil organic matter," Elsevier, Amsterdam:
 Kumada, K., O. Sato, Y. Ohsumi and S. Ohta. "Humus composition of
mountain soils in central Japan with special reference to the distribution
of P type humic acid," Soil Science and Plant Nutrition, 13: 151-158,
 Ming. DW and Boettingger, J.L.. "Zeolites in soil environments. In:
D.L.Bish & D.W.Ming (ed.) Natural Zeolites: Occurrence, Properties,
Aplications, Reviews in Mineralogy & Geochemistry," Mineralogical
Society of America & Geochemical Society, Washington DC, 45: 323-
 Polat, E., M. Karaca, H. Demir and A. Naci-Onus. " Use of natural
zeolite (clinoptilolite) in agriculture," Journal of Fruit Ornamental and
Plant research, 12: 183-189, 2004.
 Richard, T., J. Conant, Megan Steinweg, L. Haddix Michelle, A.Paul
Eldor, F.Plante Alain and Six.Johan. " Experimental warming shows that
decomposition temperature sensitivity icreases with soil organic matter
recalcitrance," Ecology, 89 (9): 2384-2391, 2008.
 Ross, S.. " Organic matter in tropical soils: current conditions, concerns
and prospects for conservation," Progress in Physical Geography, 17:
 Schimel, D.S., B. H. Braswell, E. Holland, R. McKeown, D.S. Ojima, T.
H. Painter, W. J. Parton and A. R. Townsend. "Climatic, Edaphic, and
Biotic Controls Over Storage and Turnover of Carbon in Soils," Global
Biogeochem. Cycles, 8 (3): 279-294, 1994.
 Yoshida, M., K. Sakagami, R. Hamada and T. Kurobe. "Studies on the
properties of organic matter in buried humic horizon derived from
volcanic ash. I. Humus composition of buried humic horizons," Soil
Science and Plant Nutrition, 24 (2): 277-287, 1978.