Faculty list

Dr. Chih-Yu Chiu

Deputy Director/ Research Fellow
Ph.D.—National Tsukuba University,
Tsukuba, Japan,1988 [ 中文網頁 ]
Research Fields
Soil biochemistry and microbiology, biogeochemistry
Major Research Achievements (2013-2017)
  • Lake metabolism
      We used high-frequency in situ dissolved oxygen measurements to investigate the seasonal variability and factors regulating metabolism in Yuanyang Lake (YYL), a subtropical sub-alpine lake in Taiwan. Gross primary production (GPP) and ecosystem respiration (R) both peaked in early summer and mid-autumn but dropped during the typhoon season and winter. Ecosystem respiration was more resistant to external disturbances than GPP and showed strong daily variation during typhoon seasons. Seasonal winter mixing and typhoon-induced water mixing in summer and autumn play a key role in determining the extent to which the lake is a seasonal carbon sink or source to the atmosphere.
  • Influence of typhoons on bacterial community composition in subalpine lake.
      Disturbances act as resetting events for biological communities in many types of ecosystems. In lake ecosystems typhoon/hurricanes mix an otherwise stably stratified water column, causing sudden changes in the physical, chemical, and biological environment. Bacteria in particular are expected to respond unpredictably to such large-scale disturbances, because of the immense diversity and complexity of bacterial communities. Here, for the first time, we show that typhoon-induced mixing initiates repeatable microbial community dynamics in lakes. After each of six typhoon-induced mixing events in a sub-tropical, sub-alpine lake, bacterial community composition was reset to nearly identical conditions, revealing a surprisingly deterministic pattern of recovery. These results show that bacterial communities respond to disturbance in ways analogous to how terrestrial communities respond to disturbances such as fire or windthrow.
  • Influence of typhoons on annual CO2 flux from subalpine lake
      Using high-resolution data and manually collected CO2 samples, a mass balance model of CO2 dynamics in YYL was developed. In addition, a generalized simulation model was used to explore how typhoon frequency, intensity, and timing impact CO2 efflux to the atmosphere. Our findings suggest that increased annual precipitation and frequency of typhoon events results in greater epilimnetic interaction with the watershed and hypolimnion. These interactions resulted in elevated epilimetic CO2 concentrations and therefore greater evasion of CO2 to the atmosphere.
  • Soil bacterial communities in montane forests
      Differences in the soil bacterial community caused by forest management practices were characterized using 16S ribosomal RNA (rRNA) gene clone libraries. The communities were from a disturbed Chamaecyparis (DCP) forest subjected to harvesting of snags and downed logs, a secondary Chamaecyparis (SCP) plantation subjected to harvesting of old-growth trees, and a secondary cedar plantation (SCD). These forests were compared to a nearby native Chamaecyparis (NCP) forest in a cloud montane ecosystem. Based on several diversity indices and rarefaction curves, the diversity of the SCD community was higher than that in the DCP soils. The diversity of the community in SCP soils was intermediate. The bacterial diversity of the NCP community was lower than those in three disturbed forest soils. These results suggest that the disturbance of forest harvesting and tree species conversion influence the composition of bacterial community between natural and disturbed forests and increase the diversity of the disturbed forest soil community.
  • Clay mineralogical characterization
      We have investigated the clay mineralogy of 3 pedons along a toposequence of perhumid forest soils facing a subalpine lake in northern Taiwan to gain insight into the individual factors that affect weathering rates. The major minerals in the well-drained soils at the summit site were illite and kaolinite, whereas illite and vermiculite were dominant in the poorly drained soil at the footslope. In the poorly drained soils of the lakeshore site, almost permanent saturation inhibited weathering of minerals, and vermiculite, illite and illite-vermiculite were the dominant minerals. The drainage condition caused by topography is a critical factor in the transformation and redistribution of clay minerals. High precipitation, combined with surface runoff, enhance the variation of the type and mean layer charge of clay minerals along this toposequence.
Research Interests
  • Nutrient cycles in terrestrial ecosystem
  • Distribution and function of soil organic matter in forest ecosystems
  • Radioecological studies
  • Microbial community structure in forest soils
  • Lake ecosystem metabolism
    Ongoing projects
    • The effect of altitudinal change on the organic matter composition and microbial function in forest soils
    • Influence of extreme weather on subalpine lake ecosystems
      Publications (2009-2017)
      1. Shiau, Y.J., Cai, Y., Lin, Y.T., Jia, Z., and Chiu, C.Y.*, accepted, “Community structure of active aerobic methanotrophs in red mangrove (Kandelia obovata) soils under different frequency of tides”, Microbial Ecology. (SCI) (IF: 3.232; SCI ranking: 3.8%,35%,24.7%)
      2. Lin, Y,T., Jia, Z., Wang, D., Chiu, C.Y.*, accepted, “Effects of temperature on the composition and diversity of bacterial communities in bamboo soils at different elevations”, Biogeosciences. (SCI) (IF: 3.7; SCI ranking: 9.2%,20.7%)
      3. Shiau, Y.J., and Chiu, C.Y.*, 2017, “Changes in soil biochemical properties in a cedar plantation invaded by moso bamboo.”, Forests, 8, 222. (SCI) (IF: 1.583; SCI ranking: 28.8%)
      4. Shiau, Y.J, Chen, J.S., Chung, T.L., Tian, G. and Chiu, C.Y.*, 2017, “13C NMR spectroscopy characterization of particle-size fractionated soil organic carbon in subalpine forest and grassland ecosystems”, Botanical Studies, 58, 23. (SCI) (IF: 1.159; SCI ranking: 57.9%)
      5. Shiau, Y.-J., Lin, M-F., Tan, C.-C., Tian, G. and Chiu, C.-Y.*, 2017, “Assessing N2 fixation in estuarine mangrove soils”, ESTUARINE COASTAL AND SHELF SCIENCE, 189, 84-89. (SCI) (IF: 2.335; SCI ranking: 26.2%,23.1%)
      6. Lin, Y.T., Whitman, W.B., Coleman D.C., Jien, S.H. and Chiu, C.Y.*, 2017, “Cedar and bamboo plantations alter structure and diversity of the soil bacterial community from a hardwood forest in subtropical mountain”, Applied Soil Ecology, 112, 28-33. (SCI) (IF: 2.67; SCI ranking: 23.5%)
      7. Shiau, Y.-J., Wang, H.-C., Chen, T.-H., Jien, S.-H., Tian, G., and Chiu, C.-Y.*, 2017, “Improvement in the biochemical and chemical properties of badland soils by thorny bamboo”, Scientific Reports, 7, 40561. (SCI) (IF: 5.228; SCI ranking: 11.1%)
      8. Chang , E.-H., Tian, G. , and Chiu, C.-Y.*, 2017, “Soil Microbial Communities in Natural and Managed Cloud Montane Forests”, Forests, 8(2), 33. (SCI) (IF: 1.583; SCI ranking: 28.8%)
      9. Shiau, Y. J., Lee, S.C., Chen, T.H., Tian, G., and Chiu, C.Y.* , 2017, “Water salinity effects on growth and nitrogen assimilation rate of mangrove (Kandelia candel) seedlings. ”, Aquatic Botany, 137, 50–55. (SCI) (IF: 1.846; SCI ranking: 40.4%,34%)
      10. Kimura, N., Liu W.C., Tsai, J.W., Chiu, C.Y., Kratz, T.K. and Tai A., 2017, “Contribution of extreme meteorological forcing to vertical mixing in a small, shallow subtropical lake”, JOURNAL OF LIMNOLOGY, 76(1), 116-128. (SCI) (IF: 1.725; SCI ranking: 45%)
      11. Chang, E.H., Chen, T.H., Tian, G., Hsu, C.K., and Chiu, C.Y.* , 2016, “Effect of 40 and 80 years of conifer regrowth on soil microbial activities and community structure in subtropical low mountain forests”, Forests, 7(10), 244. (SCI) (IF: 1.583; SCI ranking: 28.8%)
      12. Wang. H.C., Chou, C.Y., Chiou, C.R., Tian, G, and Chiu, C.Y.*, 2016, “Humic acid composition and characteristics of soil organic matter in relation to the elevation gradient of moso bamboo plantations ”, PLoS ONE, 11(9), e0162193. (SCI) (IF: 3.057; SCI ranking: 17.5%)
      13. Lin, Y.T. and Chiu, C.Y.* , 2016, “Elevation gradient of soil bacterial communities in bamboo plantations.”, Botanical Studies, 57, 8. (SCI) (IF: 1.159; SCI ranking: 57.9%)
      14. Jien, S.H., Baillie, I, Hu, C.C., Chen, T.H., Iizuka, Y., and Chiu, C.Y.* , 2016, “Forms and distribution of phosphorus in a placic podzolic toposequence in a subtropical subalpine forest, Taiwan. ”, Catena, 140, 145-154. (SCI) (IF: 2.612; SCI ranking: 10.6%,22.8%,26.5%)
      15. Tsai, J.W., Kratz, T.K., Rusak, J.A., Shih, W.Y., Liu, W.C., Tang, S.L., and Chiu, C.Y.*, 2016, “Absence of winter and spring monsoons cause water level changes and rapid shifts in metabolism in a subtropical lake.”, Inland Waters, 6(3), 436-448. (SCI) (IF: 1.776; SCI ranking: 43.3%,40%)
      16. Shiau, Y.J., Dham, V., Tian, G. and Chiu, C.Y.*, 2016, “Factors influencing removal of sewage nitrogen through denitrification in mangrove soils.”, Wetlands, 36, 621-630. (SCI) (IF: 1.504; SCI ranking: 56.9%,62.7%)
      17. Jien, S.H., Baillie, I, Huang, W.S., Chen, Y.Y. and Chiu, C.Y. *, 2016, “Incipient ferralization and weathering indices along a soil chronosequence in Taiwan ”, European Journal of Soil Science, 67, 583-596. (SCI) (IF: 3.425; SCI ranking: 8.8%)
      18. Wang, H.C., Tian, G., and Chiu, C.Y.* , 2016, “Invasion of moso bamboo into a Japanese cedar plantation affects the chemical composition and humification of soil organic matter. ”, Scientific Reports, 6, 32211. (SCI) (IF: 5.228; SCI ranking: 11.1%)
      19. Chang, E.H, Chen, T.H., Tian, G and Chiu, C.Y.* , 2016, “The effect of altitudinal gradient on soil microbial community activity and structure in moso bamboo plantations. ”, Applied Soil Ecology, 98, 213-220. (SCI) (IF: 2.67; SCI ranking: 23.5%)
      20. Tsai, C.W., Tian, G. and Chiu C.Y.* , 2015, “Great fraction of labile C and N resources released from the primitive per-humid Chamaecyparis forest soil. ”, Botanical Studies, 56, 27. (SCI) (IF: 1.159; SCI ranking: 57.9%)
      21. Chang, E.H. and Chiu C.Y.* , 2015, “Changes in soil microbial community structure and activity in a cedar plantation invaded by moso bamboo ”, Applied Soil Ecology, 91, 1-7. (SCI) (IF: 2.67; SCI ranking: 23.5%)
      22. Tian, G., Chiu, C.-Y., Franzluebbers, A. J., Olawale1, O. O., Granato, T. C., and Cox, A. E. , 2015, “Biosolids amendment dramatically increases sequestration of crop residue-carbon in agricultural soils in western Illinois”, Applied Soil Ecology, 85, 86-93. (SCI) (IF: 2.67; SCI ranking: 23.5%)
      23. Lin Y.-T., Whitman W. B., Coleman D. C., Shi S.-Y., Tang S.-L., Chiu C.-Y*., 2015, “Changes of soil bacterial communities in bamboo plantations at different elevations”, FEMS Microbiology Ecology, 91(5), fiv033. (SCI) (IF: 3.53; SCI ranking: 30.1%)
      24. Chen, Y.M., Tsao, T.M., Wang, M.K., Yu, S., Liu C.C., Li, H.C., Chiu, C.Y., Wang, L.C., 2015, “Kinetic and thermodynamic studies on removal of Cu(II) from aqueous solutions using soil nanoclays”, Water Environment Research, 87(1), 88-95. (SCI) (IF: 0.659; SCI ranking: 82%,78.8%,85%,89.8%)
      25. Kimura, N, Liu, W.C., Chiu, C.Y. and Kratz, T.K., 2014, “Assessing the effects of severe rainstorm-induced mixing on a subtropical, subalpine lake. ”, Environ. Monit. Assess., 186, 3091-3114. (SCI) (IF: 1.633; SCI ranking: 52%)
      26. Lin, Y.T., Tang, S.L., Pai, C.W., Whitman, W.B., David C. Coleman, D.C., and Chiu, C.Y.*, 2014, “Changes in the soil bacterial communities in a cedar plantation invaded by moso bamboo. ”, Microbial Ecology, 67(2), 421-429. (SCI) (IF: 3.232; SCI ranking: 3.8%,35%,24.7%)
      27. Lin, Y.T., Hu, H.W., Whitman, W. B., Coleman, D.C. and Chiu, C.Y.* , 2014, “Comparison of soil bacterial communities in a natural hardwood forest and coniferous plantations in perhumid subtropical low mountains.”, Botanical Studies, 55, 50. (SCI) (IF: 1.159; SCI ranking: 57.9%)
      28. Lin, Y.T., Whitman, W.B., Coleman, D.C., Chen, T.H., and Chiu, C.Y.*, 2014, “Composition of bacterial communities in sand dunes of subtropical coastal forests. ”, Biology and Fertility of Soils, 50(5), 809-814. (SCI) (IF: 3.069; SCI ranking: 11.8%)
      29. Huang, C.Y., Jien, S.H., Chen, T.H., Tian, G. and Chiu, C.Y.*, 2014, “Soluble organic C and N and its relationships with soil organic C and N and microbial characteristics in moso bamboo (Phyllostachys edulis) plantations along an elevation gradient in Central Taiwan”, Journal of Soils and Sediments, 14, 1061-1070. (SCI) (IF: 2.206; SCI ranking: 29.4%,40.9%)
      30. Chen, Y.M., Chiu, C.Y., Tsao, T.M., Liu, C.C., Chen, Y.H., Huang, P.M. and Wang, M.K. . , 2013, “Adsorption of cadmium on aluminum precipitates in the absence or presence of catechins. ”, Separation Science and Technology, 48(4), 598-606. (SCI) (IF: 1.083; SCI ranking: 61.5%,70.6%)
      31. Chen, J.S., Chung, T.L., Tian, G., and Chiu, C.Y. * , 2013, “Characterization of soil organic matter in perhumid natural cypress forest: Comparison of humification in different particle-size fractions. ”, Botanical Studies, 54, 56. (SCI) (IF: 1.159; SCI ranking: 57.9%)
      32. Solomon, C.T., D. A. Bruesewitz, D.C. Richardson, K.C. Rose, M.C. Van de Bogert, P.C. Hanson, T.K. Kratz, B. Larget, R. Adrian, B. Leroux Babin, C.Y. Chiu, D.P. Hamilton, E.E. Gaiser, S. Hendricks, V. Istvánovics, A. Laas, D.M. O’Donnell, M.L. Pace, E. Ryder, P.A. Staehr, T. Torgersen, M.J. Vanni, K.C. Weathers, G. Zhu, 2013, “Ecosystem respiration: drivers of daily variability and background respiration in lakes around the globe”, Limnology & Oceanography, 58(3), 849-866. (SCI) (IF: 3.66; SCI ranking: 6.6%,10%)
      33. Jien, S.H., Pai, C.W., Iizuka, Y. and Chiu, C.Y.* , 2013, “Pedogenic processes of placic and spodic horizons in sub-tropical sub-alpine forest soils with contrasting textures. ”, European Journal of Soil Science, 64(4), 423-434. (SCI) (IF: 3.425; SCI ranking: 8.8%)
      34. Chung, T.L., Chen, J.S., Chiu, C.Y.* and Tian, G., 2012, “13C-NMR spectroscopy studies of humic substances in subtropical perhumid montane forest soil. ”, Journal of Forest Research, 17(6), 458-467. (SCI) (IF: 0.658; SCI ranking: 53%; SCI ranking: 66.7%)
      35. Lin, Y.T., Whitman, W.B., Coleman, D.C. and Chiu, C.Y.*, 2012, “Comparison of soil bacterial communities between coastal and inland forests in subtropical area.”, Applied Soil Ecology, 60, 49-55. (SCI) (IF: 2.67; SCI ranking: 23.5%)
      36. Jennings, E., Jones, S., Arvola, L., Staehr, P. A., Gaiser, E., Jones, I.D., Weathers, K.C., Weyhenmeyer, G.A., Chiu, C.Y., de Eyto, E., 2012, “Effects of weather-related episodic events in lakes: an analysis based on high frequency data. ”, Freshwater Biology, 57(3), 589-601. (SCI) (IF: 2.933; SCI ranking: 10.6%)
      37. Liu, W.C., Chen, W.B. and Chiu, C.Y., 2012, “Numerical modelling of hydrodynamic and hydrothermal characteristics in subtropical alpine lake. ”, Applied Mathematical Modelling, 36(5), 2094-2109. (SCI) (IF: 2.291; SCI ranking: 12.9%,14.1%,16.3%)
      38. Kimura, N., Liu, W.C, Chiu, C.Y., Kratz, T.K. and Chen W.B. , 2012, “Real-time observation and prediction of physical processes in a typhoon-affected lake”, Paddy and Water Environment, 10(1), 17-30. (SCI) (IF: 0.871; SCI ranking: 64.3%,51.8%)
      39. Kimura, N, Liu*, W.C., Chen, W.B. and Chiu, C.Y., 2012, “The influences of typhoon-induced mixing in a shallow lake. ”, Lakes & Reservoirs: Research and Management, 17(3), 171-183.
      40. Ku, H.M, Tan, C.W., Su, Y.S., Chiu, C.Y., Chen, C.T. and Jan, F.J., 2012, “The involvement of water deficiency and copper effects on proline metabolism in Nicotiana benthamiana under excess copper. ”, Biologia Plantarum, 56(2), 337-343. (SCI) (IF: 1.665; SCI ranking: 37.3%)
      41. Cheng, W.Y., Wu, C.Y., Liu, W.C.*, Chiu, C.Y., 2012, “Using water quality variables to establish light attenuation model in subtropical subalpine Yuan-Yang Lake. , ”, Journal of Taiwan Water Conservancy, 60(2), 63-73.. (EI)
      42. Lin,Y.T., Whitman, W.B., Coleman, D.C. and Chiu, C.Y.* ., 2011, “Molecular characterization of soil bacterial community in a perhumid, low mountain forest.. ”, Microbes and Environments, 26(4), 325-331. (SCI) (IF: 2.075; SCI ranking: 52.2%,65.9%)
      43. Chang, E.H., Chen, C.T. and Chiu, C.Y.* , 2011, “Soil microbial communities and activities in sand dunes of subtropical coastal forests”, Applied Soil Ecology, 49, 256-262. (SCI) (IF: 2.67; SCI ranking: 23.5%)
      44. Chiang, P.N., Chiu, C.Y. , Wang, M.K., Chen, B.T., 2011, “Low-molecular-weight organic acids exuded by millet (Setaria italica (L.) Beauv.) roots and their effect on the remediation of cadmium-contaminated soil. ”, Soil Science, 176(1), 33-38. (SCI) (IF: 0.713; SCI ranking: 82.4%)
      45. Lin, Y.T., Jangid, K., Whitman, W.B., Coleman, D.C. and Chiu, C.Y. *, 2011, “Change in bacterial community structure in response to disturbance of natural hardwood and secondary coniferous forest soils in central Taiwan. (*corresponding author)”, Microbial Ecology, 61:429–437. (SCI) (IF: 3.232; SCI ranking: 3.8%,35%,24.7%)
      46. Chiu, C.Y. and Tian, G., 2011, “Chemical structure of humic acids in biosolids-amended soils as revealed by NMR spectroscopy.”, Applied Soil Ecology, 49, 76-80. (SCI) (IF: 2.67; SCI ranking: 23.5%)
      47. Jien, S.H., Chen, T.H. and Chiu, C.Y. * , 2011, “Effects of afforestation on soil organic matter characteristics under subtropical forests with low elevation. (*corresponding author) DOI:10.1007/s10310-010-0231-8”, J Forest Res-Jpn, 16, 275-283. (SCI) (IF: 0.929; SCI ranking: 53%)
      48. Tsai, J.W., Kratz, T.K., Hanson, P.C., Kimura N., Liu, W.C., Lin, F.P., Chou, H.M., Wu, J.T. and Chiu, C.Y. *, 2011, “Metabolic changes and the resistance and resilience of a subtropical heterotrophic lake to typhoon disturbance. ”, Canadian Journal of Fisheries and Aquatic Sciences, 68, 768-780. (SCI) (IF: 2.437; SCI ranking: 13.5%,16.3%)
      49. Lin,Y.T., Jangid, K., Whitman, W.B., Coleman, D.C. and Chiu, C.Y.* , 2011, “Soil bacterial communities in native and regenerated perhumid montane forests”, Applied Soil Ecology, 47(2), 111–118. (SCI) (IF: 2.67; SCI ranking: 23.5%)
      50. Lin, YT, Lin, C.P., Chaw, S.M., Whitman, W.B., Coleman, D.C. and Chiu, C.Y.* , 2010, “Bacterial community of very wet and acidic subalpine forest and fire-induced grassland soils”, Plant and Soil, 332(1-2), 417-427 (*corresponding author). (SCI) (IF: 2.969; SCI ranking: 18.7%,10.8%,14.7%)
      51. Jien, S.H., Hseu, Z.Y., Iizuka, Y., Chen, T.H. and Chiu, C.Y.*, 2010, “Geochemical characterization of placic horizons in subtropical montane forest soils, Northeastern Taiwan. ”, European Journal of Soil Science, 61(3), 319-332. (*corresponding author). (SCI) (IF: 3.425; SCI ranking: 8.8%)
      52. Jien, S.H., Wu, S.P., Chen, Z.S., Chen, T.H., and Chiu, C.Y.*, 2010, “Characteristics and pedogenesis of podzolic forest soils along a toposequence near a subalpine lake in northern Taiwan. ”, BOTANICAL STUDIES, 51, 223-236 (*corresponding author). (SCI) (IF: 1.159; SCI ranking: 57.9%)
      53. Shade, A., Chiu, C.Y. and McMahon, K.D. , 2010, “Seasonal and episodic lake mixing stimulate differential planktonic bacterial dynamics. ”, Microbial Ecology, 59(3), 546-554. (SCI) (IF: 3.232; SCI ranking: 3.8%,35%,24.7%)
      54. Lin, Y.T., Huang, Y.J., Tang, S.L., Whitman, W.B., Coleman, D.C. and Chiu, C.Y.*, 2010, “Bacterial community diversity in undisturbed perhumid montane forest soils in Taiwan”, Microbial Ecology, 59(2), 369-378 (*corresponding author). (SCI) (IF: 3.232; SCI ranking: 3.8%,35%,24.7%)
      55. Shade, A., Chiu, C.Y. and McMahon, K.D., 2010, “Differential bacterial dynamics promote emergent community robustness to lake mixing: an epilimnion to hypolimnion transplant experiment.”, Environmental Microbiology, 12(2), 455-466. (SCI) (IF: 5.932; SCI ranking: 13%)
      56. Chiang, P.N., Wang, M.K., Huang, P.M. Wang, J.J. and Chiu, C.Y., 2010, “Cesium and strontium sorption by selected tropical and subtropical soils around nuclear facilities”, Journal of Environmental Radioactivity, 101, 472–481. (SCI) (IF: 2.047; SCI ranking: 44%)
      57. Jien, S.H., Chen, T.H., Chiu, C.Y.*, and Nagatsuka, S. , 2009, “Relations between soil mass movement and relief in humid subtropical low elevation mountains. ”, Soil Science, 174(10), 563-573. (SCI) (IF: 0.713; SCI ranking: 82.4%)
      58. Jien S.H., Chiu C.Y., and Chen T.H., 2009, “Soil Characteristics and genesis processes of a subtropical low-elevation mountain forest in central Taiwan ”, Taiwan Journal of Forest Science, 24, 27-40.. (EI)
      59. Jones, S.E., Kratz, T.K. Chiu, C.Y. and McMahon, K.D., 2009, “The influence of typhoons on annual CO2 flux from a sub-tropical, humic lake”, Global Change Biology, 15, 243-254. (SCI) (IF: 8.444; SCI ranking: 4%,2%,1.8%)