Concentrations and seasonal dynamics of dissolved organic carbon in forest floors of two plantations (Castanopsis kawakamii andCunninghamia lanceolata) in subtropical China

Abstract

The concentrations and seasonal dynamics of DOC in forest floors of monoculture plantations ofCastanopsis kawakamii and Chinese fir (Cunninghamia lanceolata) were assessed in Sanming, Fujian, China (26°11′30″N, 117°26′00″E). Forest floor samples were taken in January, April, July and October in 2002 and divided into undecomposed material (horizon Oi), partially decomposed organic material (horizon Oe), and fully decomposed organic material (horizon Oa). Upon collection, DOC concentrations of samples were analyzed by a High Temperature TOC. The results showed that the annual average DOC concentration of Chinese fir (1341.7 mg·kg⁻¹) in the forest floor was higher than that ofCastanopsis kawakamii (1178.9 mg·kg⁻¹). Difference in DOC concentrations was observed among three horizons of the forest floor. DOC concentration of forest floor in the two forests was the highest in horizon Oe. Seasonal trends of DOC concentrations in different horizons of forest floors were similar and the maximal value occurred in autumn (or winter). The concentration and temporal change of DOC in studied forests were probably related to the variation in moisture, temperature, biological activity and quantity of organic matter in the forest floor.

Keywords

Dissolved organic carbon (DOC) / Seasonal dynamics / Forest floor / Castanopsis kawakamii / Cunninghamia lanceolata / Monoculture plantation / S715.9 / S791.27 / A

References

[1] Casals P., Romanya J., Cortina J. et al. Nitrogen supply rate in Scots pine (Pinus sylvestris L.) forests of contrasting slope aspect [J]. Plant and Soil, 1995, 168–169: 67-73.

[2] Christ M.J., David M.B. Temperature and moisture effects on the production of dissolved organic carbon in a spodosol [J]. Soil Biology & Biochemistry, 1996, 28: 1191-1199.

[3] Cronan C.S. Perdue EM, Gjessing ET Patterns of organic acid transport from forested water-sheds to aquatic ecosystems [C] Organic Acids in Aquatic Ecosystems, 1990 Chichester: John Wiley and Sons Ltd. 245-260.

[4] Cronan C.S., Aiken G.R. Chemistry and transport of soluble humic substances in forested watersheds of the Adirondack Park, New York [J]. Geochim. Cosmochim. Acta, 1985, 49: 1697-1705.

[5] Currie W.S., Aber J.D. Modeling leaching as a decomposition process in humid montane forests [J]. Ecology, 1997, 78(6): 1844-1860.

[6] Currie W.S., Aber J.D., McDowell W.H. et al. Vertical transport of dissolved organic C and N under long-term N amendments in pine and hardwood forests [J]. Biogeochemistry, 1996, 35: 471-505.

[7] Hongve D., Van Hees P.A.W., Lundström U.S. Dissolved components in precipitation water percolated through forest litter [J]. European Journal of Soil Science, 2000, 51: 667-677.

[8] Huang W.Z., Schoenau J.J. Distribution of water-soluble organic carbon in an aspen forest soil [J]. Canadian Journal of Forest Research, 1996, 26: 1266-1272.

[9] Kaiser K., Guggenberger G., Haumaier L. et al. Seasonal variations in the chemical composition of dissolved organic matter in organic forest floor layer leachates of old-growth Scots pine (Pinus sylvestris L.) and European beech (Fagus sylvatica L.) stands in northeastern Bavaria, Germany [J]. Biogeochemistry, 2001, 55: 103-143.

[10] Kalbitz K., Solinger S., park J.H. et al. Controls on the dynamics of dissolved organic matter in soils: a review [J]. Soil Science, 2000, 165(4): 277-304.

[11] Kawahigashi M., Sumida H., Yamamoto K. Seasonal changes in organic compounds in soil solutions obtained from volcanic ash soils under different land uses [J]. Geoderma, 2003, 113: 381-396.

[12] Peng Lin, Xizhao Qiu Study on theCastanopsis kawakamii forest in the Wakeng area of Sanming city, Fujian province [J]. Acta Phytoecol. Geobot. Sinica, 1986, 10(4): 241-252. (in Chinese)

[13] Lundström U.S. The role of organic acids in the soil solution chemistry of a podzolized soil [J]. Journal of Soil Science, 1993, 44: 121-133.

[14] McDowell W.H., Currie W.S., Aber J.D. et al. Effects of chronic nitrogen amendments on production of dissolved organic carbon and nitrogen in forest soils [J]. Water, Air and Soil Pollution, 1998, 105: 175-182.

[15] McDowell W.H., Likens G.E. Origin, composition and flux of dissolved organic carbon in the Hubbard Brook Valley [J]. Ecological Monographs, 1988, 58: 177-195.

[16] Michalzik B., Kalbitz K., Park J.H. et al. Fluxes and concentrations of dissolved organic carbon and nitrogen—a synthesis for temperate forest [J]. Biogeochemistry, 2001, 52: 173-205.

[17] Michalzik B., Matzner E. Dynamics of dissolved organic nitrogen and carbon in a central European Norway spruce ecosystem [J]. European Journal of Soil Science, 1999, 50: 579-590.

[18] Neff J.C., Asner G.P. Dissolved organic carbon in terrestrial ecosystems: synthesis and a model [J]. Ecosystems, 2001, 4: 29-48.

[19] Park Ji-H., Matzner E. Controls on the release of dissolved organic carbon and nitrogen from a deciduous forest floor investigated by manipulations of aboveground litter inputs and water flux [J]. Biogeochemistry, 2003, 66: 265-286.

[20] Qualls R.G., Haines B.L. Geochemistry of dissolved organic nutrients in water percolating through a forest ecosystem [J]. Soil Science Society of America Journal, 1991, 55: 1112-1123.

[21] Qualls R.G., Haines B.L., Swank W.T. Fluxes of dissolved organic nutrients and humic substances in a deciduous forest [J]. Ecology, 1991, 72: 254-266.

[22] Richter D.D., Markewitz D., Trumbore S.E. et al. Rapid accumulation and turnover of soil carbon in a re-establishing forest [J]. Nature, 1999, 400: 56-58.

[23] Schlesinger W.H., Lichter J. Limited carbon storage in soil and litter of experimental forest plots under increased atmospheric CO₂ [J]. Nature, 2001, 411: 466-468.

[24] Scott M.J., Jones M.N., Woof C. et al. Concentrations and fluxes of dissolved organic carbon in drainage water from an upland peat system [J]. Environment International, 1998, 24: 537-546.

[25] Tipping E., Woof C., Rigg E. et al. Climatic influences on the leaching of dissolved organic matter from upland UK moorland soils, investigated by a field manipulation experiment [J]. Environment International, 1999, 25: 83-95.

[26] Vance G.F., David M.B. Forest soil response to acid and salt additions of sulfate: III. Solubilization and composition of dissolved organic carbon [J]. Soil Science, 1991, 151: 297-305.

[27] Yusheng Yang, Guangshui Chen, Peng Lin et al. Fine root distribution, seasonal pattern and production in a native forest and monoculture plantations in subtropical China [J]. Acta Ecologica Sinica, 2003, 23(9): 1719-1730. (in Chinese)

[28] Yusheng Yang, Zhenwen Li, Aiqin Liu et al. Studies on soil fertility for natural forest ofCastanopsis kawakamii replaced by broadleaf plantation [J]. Journal of Northeast Forestry University, 1993, 21(5): 14-21. (in Chinese)

[29] Yusheng Yang, Ruiyu Lin, Tingbo Li et al. Ultraviolet-visible spectroscopic characteristics of dissolved organic matter released from forest litterfall [J]. Journal of Tropical and Subtropical Botany, 2004, 12(2): 124-128. (in Chinese)

[30] Yusheng Yang, Jianfen Guo, Guangshui Chen et al. Litterfall, nutrient return, and leaf-litter decomposition in four plantations compared with a natural forest in subtropical China [J]. Annals of Forest Science, 2004, 61: 465-476.

[31] Zsolnay, A. 1996. Dissolved humus in soil waters [C]. In: Piccolo A (Ed.) Humic Substances in Terrestrial Ecosystems. Elsevier Science B.V., pp 171–223.