Water status of bare-root seedlings of Chinese fir and Masson pine

Abstract

Water relation parameters of bare-root seedlings of Chinese fir (Cunninghamia lanceolata Hook.) and Masson pine (Pinus massoniana Lamb.) were measured and changes of root growth potential as well as field survival rate of both species were studied after the bare-root seedlings were exposed in a sunny field conditiory. The results showed that Masson pine had a lower osmotic potential (−2.07Mp_a) at turgor loss point and at, full turgor (−1.29Mp_a), compared with Chinese fir (−1.80Mp_a and −1.08Mp_a respectively). The parameter V_p/V₀ (63.27%) of Masson pine was higher than that of Chinese fir (58.03%). This means that Masson pine has a stronger ability to tolerate desiccation, compared to Chinese fir according to analysis of above water relation parameters. Root growth potential and field survival rate decreased with prolonging duration of exposure. The field survival rate of both species was reduced to less than 40% after the seedling being exposed only two hours. Water potentials of −1.60 Mpa and −1.70 Mpa were suggested to be critical values for Chinese fir and Masson pine respectively in successful reforestation.

Keywords

Chinese fir / Masson pine / Water relations / Seedling desiccation / Water potential / Root growth potential / S791.27 / S791.248 / A

References

[1] Abrams M.D. Sources of variation in osmotic potentials with special reference to North American tree species [J]. For. Sci., 1988, 34: 1030-1046.

[2] Burdett A.N. Physiological processes in plantation establishment and the development of specifications for forest planting stock [J]. Can. J. For. Res., 1990, 20: 415-427.

[3] Cheung Y.N.S., Tyree M.T., Dainty J. Water relation parameters on single leaves obtained in a pressure bomb and some ecological interpretations [J]. Canadian Journal of Botany, 1975, 53: 1342-1346.

[4] Choi H.S. Variation in water potential components among half-sib families of shortleaf pine (Pinus echinata) in response to soil drought [J]. Can. J. For. Res., 1992, 22: 111-116.

[5] Feret P.P., Kreh R.E., Mulligan C. Effects of air drying on survival, height and root growth potential of loblolly pine seedlings [J]. Southern J. Appl. For., 1985, 9: 125-128.

[6] Hermann R.K. Seasonal variation in the sensitivity of Douglas fir seedlings to exposure of, roots [J]. For. Sci., 1967, 13: 140-149.

[7] Insley H., Buckley G.P. the influence of desiccation and root pruning on the survival and growth of broadleaved seedlings [J]. J. Hort. Sci., 1985, 60: 377-387.

[8] Lopushinsky, W. 1990. Seedling moisture status [C], pp. 123–128. In: Rose, R., Campbell, S.J. and Landis, T.D. (Eds). Target Seedling Symposium, Proceedings, Combined Meetings of the Western Forest Nursery Associations USDA Forest Service General Technical Report RM-200.

[9] Margolis H.A., Brand D.G. An ecophysiological basis for understanding plantation establishment [J]. Can. J. For. Res., 1990, 20: 375-390.

[10] McKay H.M. A review of the effect of stresses between lifting and planting on nursery stock quality and performance [J]. New Forests, 1997, 13: 369-399.

[11] McKay H.M., White I.M.S. Fine root electrolyte leakage and moisture content: indices of Sitka spruce and Douglas fir seedling performance after desiccation [J]. New Forests, 1997, 13: 139-162.

[12] Scholander P.F., Hammel H.T., Hemmingsen E.A. et al. Hydrostatic pressure and osmotic potentials in, leaves of mangroves and some other plants [J]. Proc. Natl. Acad. Sci. (USA), 1964, 51: 119-125.

[13] Scholander P.F., Hammel H.T., Bradstreet E.D. et al. Sap pressure in vascular plants [J]. Sciences (Wash.), 1965, 148: 339-346.

[14] Seiler J.R., Cazell B.H. Influence of water stress on the physiology and growth of red spruce seedlings Tree Physiology, 1990, 6: 69-77.

[15] Sharpe A.L., Mason W.L. Some methods of cold storage can seriously affect root growth potential and root moisture content and subsequent forest performance of Sitka spruce and Douglas fir transplants [J]. Forestry, 1992, 65: 463-472.

[16] Tabbush P.M. Effect of desiccation on water status and forest performance of barercoted Sitka Spruce and Douglas fir transplants [J]. Forestry, 1987, 60(1): 31-43.

[17] Tyree M.T., Hammel H.T. The measurement of the turgor pressure and the water relations of plants by the pressure-bomb technique [J]. Journal of Experimental Botany, 1972, 23(74): 267-282.

[18] Tyree M.T., MacGregor M.E., Petrov A. et al. A comparison of systematic errors between the Richards and Hammel methods of measuring tissue-water relations parameters [J]. Canadian Journal of Botany, 1978, 56: 2153-2161.