The Role of Balsam Poplar Secondary Chemicals in Controlling Soil Nutrient Dynamics through Succession in the Alaskan Taiga

The vegetation mosaic of the Alaskan taiga is produced by patterns of disturbance coupled to well-defined successional patterns. In primary succession on river floodplains, one of the critical transitions in succession is that from thinleaf alder (Alnus tenuifolia) to balsam poplar (Populus balsamifera). This is the shift from a N2-fixing shrub to a deciduous tree. Through this transition there are major changes in N cycling including a decrease in N2-fixation, mineralization, and nitrification. Most models of plant effects on soil processes assume that these changes are caused by shifts in litter quality and C/N ratio. This paper reviews several studies examining the effects of balsam poplar secondary chemicals on soil nutrient cycling. Balsam poplar tannins inhibited both N2-fixation in alder, and decomposition and N-mineralization in alder soils. Other poplar compounds, including low-molecular-weight phenolics, were microbial substrates and increased microbial growth and immobilization, thereby reducing net soil N availability. Thus, substantial changes in soil N cycling through succession appear to have been mediated by balsam poplar secondary chemicals.

[1]  R. Starkey,et al.  ENZYME INACTIVATION AS A FACTOR IN THE INHIBITION OF DECOMPOSITION OF ORGANIC MATTER BY TANNINS , 1968 .

[2]  A. Gallardo,et al.  Nitrogen immobilization in leaf litter at two Mediterranean ecosystems of SW Spain , 1992 .

[3]  C. T. Dyrness,et al.  Control of soil development on the Tanana River floodplain, interior Alaska , 1993 .

[4]  P. Sánchez,et al.  Nitrogen release from the leaves of some tropical legumes as affected by their lignin and polyphenolic contents , 1991 .

[5]  D. Binkley,et al.  Biogeochemistry of adjacent conifer and alder-conifer stands , 1992 .

[6]  I. Baldwin,et al.  Protein-binding phenolics and the inhibition of nitrification in subalpine balsam fir soils , 1983 .

[7]  J. Bryant,et al.  Effects of Moose Browsing on Decomposition Rates of Birch Leaf Litter in a Subarctic Stream , 1991 .

[8]  W. Post,et al.  Global patterns of soil nitrogen storage , 1985, Nature.

[9]  Thomas P. Clausen,et al.  Effects of balsam poplar (Populus balsamifera) tannins and low molecular weight phenolics on microbial activity in taiga floodplain soil: implications for changes in N cycling during succession , 1996 .

[10]  L. Butler,et al.  Chapter 10 – Tannins and Lignins , 1991 .

[11]  J. Anderson,et al.  Decomposition in Terrestrial Ecosystems , 1979 .

[12]  K. Killingbeck,et al.  Allelopathic inhibition of nitrification and nitrifying bacteria in a ponderosa pine (Pinus ponderosa Dougl.) community. , 1980 .

[13]  D. Schimel.  Carbon and nitrogen turnover in adjacent grassland and cropland ecosystems , 1986 .

[14]  L. Belser,et al.  Specific Inhibition of Nitrite Oxidation by Chlorate and Its Use in Assessing Nitrification in Soils and Sediments , 1980, Applied and environmental microbiology.

[15]  Daniel H. Mann,et al.  Spruce succession, disturbance, and geomorphology on the Tanana River floodplain, Alaska , 1995 .

[16]  J. Schimel,et al.  Decomposition and biomass incorporation of 14c-labeled glucose and phenolics in taiga forest floor: effect of substrate quality, successional state, and season , 1993 .

[17]  J. Schimel,et al.  Nitrogen turnover and availability during succession from alder to poplar in Alaskan taiga forests , 1995 .

[18]  Jerry M. Melillo,et al.  Predicting long-term patterns of mass loss, nitrogen dynamics, and soil organic matter formation from initial fine litter chemistry in temperate forest ecosystems , 1990 .

[19]  D. Janzen,et al.  Herbivores: Their Interaction With Secondary Plant Metabolites , 1982 .

[20]  John Pastor,et al.  Interactions between woody plants and browsing mammals mediated by secondary metabolites , 1991 .

[21]  C. T. Dyrness,et al.  An overview of the vegetation and soils of the floodplain ecosystems of the Tanana River, interior Alaska , 1993 .

[22]  R. Starkey,et al.  EFFECT OF PURIFIED PLANT TANNIN ON DECOMPOSITION OF SOME ORGANIC COMPOUNDS AND PLANT MATERIALS , 1968 .

[23]  Randy A. Dahlgren,et al.  Polyphenol control of nitrogen release from pine litter , 1995, Nature.

[24]  G. Lettinga,et al.  Toxicity of Tannic Compounds to Microorganisms , 1992 .

[25]  J. Fortin,et al.  IN VITRO ALLELOPATHIC INHIBITION OF NITRIFICATION BY BALSAM POPLAR AND BALSAM FIR , 1982 .

[26]  R. Starkey,et al.  VEGETABLE TANNINS, THEIR DECOMPOSITION AND EFFECTS ON DECOMPOSITION OF SOME ORGANIC COMPOUNDS , 1968 .

[27]  C. T. Dyrness,et al.  Fire in Taiga Communities of Interior Alaska , 1986 .

[28]  C. T. Dyrness,et al.  Forest Ecosystems in the Alaskan Taiga , 1986, Ecological Studies.

[29]  P. Sánchez,et al.  Decomposition and nutrient release patterns of the leaves of three tropical legumes , 1990 .