Abstract
Understory biomass heterogeneity underPlatanus occidentalis L.,Quercus alba L.,Celtis occidentalis Pursh., andUlmus americana L. was studied. Soil pH, Ca, Mg, Mn, Cu, NH4 nitrogen, total N, and soil moisture were significantly different under all dominant species. The pattern of soil moisture levels under different tree species was not consistent from one sampling period to the next. The aboveground biomass of understory vegetation also varied significantly under different tree species and was not correlated with variation in any of the soil properties. Maximum understory biomass gain (340%) from May to September occurred under oak trees, where soil moisture and most nutrients were the lowest. On the other hand, sycamore and hackberry had continuous release of allelochemics and the smallest understory biomass gain (103%) during the growing season, even though soil under both species had more moisture and nutrients than the soils under white oak. Eliminating all the factors studied leads to the conclusion that organic substances released in the immediate environment of dominant trees and their litter influenced soils and associated herb growth. In each dominant niche system, understory species may have to develop their own system (“microniche”) to minimize the stresses of competition and allelochemics.
Similar content being viewed by others
References
Colton, C.E., andEinhellig, F.A. 1980. Allelopathic mechanisms of velvetleaf (Abutilon theophrasti Medic.) on soybean.Am. J. Bot. 67:1407–1413.
Einhellig, F.A., andRasmussen, J.A. 1979. Effects of three phenolic acids on chlorophyll content and growth of soybean and grain sorghum seedlings.J. Chem. Ecol. 5:815–824.
Einhellig, F.A., Rice, E.L., Risser, P.G. andWender, S.H. 1970. Effect of scopoletin on growth, CO2 exchange rates, and concentration of scopolin and chlorogenic acids in tobacco, sunflower, and pigweed.Bull. Torrey Bot. Club 97:22–33.
Garbutt, K., andZangerl, A.R. 1983. Application of genotype-environment in ecology.Ecology 64:1292–1296.
Gauch, H.G., andStone, E.L. 1979. Vegetation and soil pattern in a mesophytic forest at Ithaca, New York.Am. Midl. Nat. 102:332–345.
Gersper, P.L., andHolowaychuck, N. 1971. Some effects of stemflow from forest canopy trees on chemical properties of soils.Ecology 52:691–703.
Glass, A.D.M. 1974a. Influence of phenolic acids on ion uptake. II. A structure activity study of the inhibition of phosphate uptake by benzoic acid derivatives.Bull. R. Soc. N.Z. 12:159–164.
Glass, A.D.M. 1974b. Influence of phenolic acids upon ion uptake. III. Inhibition of potassium absorption.J. Exp. Bot. 25:1104–1113.
Jamison, V.C. 1942. The slow reversible drying of sandy surface soils beneath citrus trees in central Florida.Proc. Soil. Sci. Soc. Am. 7:36–41.
Lauenroth, W.K., Dodd, J.L., andSims, P.L. 1978. The effects of water- and nitrogen-induced stresses on plant community structure in a semiarid grassland.Oecologia 36:211–222.
Levitt, J. 1972. Responses of Plants to Environmental Stresses. Academic Press, New York.
Lodhi, M.A.K. 1976. Role of allelopathy as expressed by dominating trees in a lowland forest in controlling the productivity and pattern of herbaceous growth.Am. J. Bot. 63:1–8.
Lodhi, M.A.K. 1977. The influence and comparison of individual trees on soil properties and possible inhibition of nitrification due to intact vegetation.Am. J. Bot. 64:260–264.
Lodhi, M.A.K. 1978a. Allelopathic effects of decaying litter of dominant trees and their associated soil in a lowland forest community.Am. J. Bot. 65:340–344.
Lodhi, M.A.K. 1978b. Comparative inhibition of nitrifiers and nitrification in a forest community as a result of the allelopathic nature of various tree species.Am. J. Bot. 65:1135–1137.
Lodhi, M.A.K., andNickell, G.L. 1973. Effects of leaf extracts ofCeltis laevigata on growth, water content, and carbon dioxide exchange rates of three grass species.Bull. Torrey Bot. Club 100:159–165.
McIntosh, R.P. 1970. Community, competition, and adaptation.Q. Rev. Biol. 45:259–280.
Parrish, J.A.D., andBazzaz, F.A. 1976. Underground niche separation in successional plants.Ecology 57:1281–1288.
Pickett, S.T.A., andBazzaz, F.A. 1976. Divergence of two co-occurring successional annuals along a soil moisture gradient.Ecology 57:169–176.
Rogers, R.S. 1983. Annual variability in community organization of forest herbs: Effect of an extremely warm and dry early spring.Ecology 64:1086–1091.
Sokal, R.R., andRohlf, F.J. 1981. Biometry, 2nd ed. W.H. Freeman, New York.
Zinke, P.J. 1962. The pattern of influence of individual forest trees on soil properties.Ecology 43:130–133.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Lodhi, M.A.K., Johnson, F.L. Forest understory biomass heterogeneity is “moisture complex” or associated litter the cause?. J Chem Ecol 15, 429–437 (1989). https://doi.org/10.1007/BF02027802
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02027802