Comparison of direct and indirect estimation of leaf area index in mature Norway spruce stands of eastern Germany

IIn three mature Norway spruce (Picea abies (L.) Karst.) stands of the Erzgebirge (Ore Mountains) in eastern Germany, the performance of the LAI-2000 plant canopy analyzer (LI-COR instruments) was tested for indirect estimation of leaf area index (LAI). The LAI-2000 calculates effective leaf area index (LAIe, m2/m2) resulting from radiation measurements and subsequent model calculations. LAIe underestimated directly estimated half the total leaf area index (LAI0.5t, m2/m2) by 37-82% as determined from allometric relationships derived from subsample harvesting. The degree of underestimation was dependent upon stand density in two of three spruce stands examined; it was the highest in sparsely stocked plots. The relationship of LAIe to allometrically determined LAI0.5t for one of the three stands differed significantly from the other two spruce stands and the underestimation of LAI0.5t was less distinct. This was explained by stand structure, i.e., higher amounts of nonassimilating surfaces relative to LAI0...

[1]  M. Monsi.  Uber den Lichtfaktor in den Pflanzengesellschaften und seine Bedeutung fur die Stoffproduktion , 1953 .

[2]  Jb Miller,et al.  A formula for average foliage density , 1967 .

[3]  Structure of the Assimilation System of a Dominating Spruce Tree (Picea abies (L.) Karst.) of Closed Stand: Computation of Needle Surface Area by Means of a Variable Geometric Needle Model , 1977 .

[4]  D. Kleinbaum,et al.  Applied Regression Analysis and Other Multivariate Methods , 1978 .

[5]  R. Curtis.  A Simple Index of Stand Density for Douglas-fir , 1982 .

[6]  Harry T. Valentine,et al.  Subsampling trees for biomass, volume or mineral content , 1984 .

[7]  J. Marshall,et al.  Comparison of Methods of Estimating Leaf‐Area Index In Old‐Growth Douglas‐Fir , 1986 .

[8]  J. Marshall,et al.  Leaf area – sapwood area relationships in adjacent young Douglas-fir stands with different early growth rates , 1987 .

[9]  D. A. Perry,et al.  Distribution and increment of biomass in adjacent young Douglas-fir stands with different early growth rates , 1987 .

[10]  F. Smith,et al.  Leaf Area-Sapwood Area Relations of Lodgepole Pine as Influenced by Stand Density and Site Index , 1988 .

[11]  T. A. Black,et al.  Characteristics of shortwave and longwave irradiances under a Douglas-fir forest stand , 1991 .

[12]  M. Huston,et al.  A comparison of direct and indirect methods for estimating forest canopy leaf area , 1991 .

[13]  S. T. Gower,et al.  Rapid Estimation of Leaf Area Index in Conifer and Broad-Leaf Plantations , 1991 .

[14]  J. Norman,et al.  Instrument for Indirect Measurement of Canopy Architecture , 1991 .

[15]  J. Chen,et al.  Measuring leaf area index of plant canopies with branch architecture , 1991 .

[16]  J. Chen,et al.  Defining leaf area index for non‐flat leaves , 1992 .

[17]  J. M. Chen,et al.  Effects of clumping on estimates of stand leaf area index using the LI-COR LAI-2000 , 1993 .

[18]  M. Abrams,et al.  Seasonal ecophysiology and leaf morphology of four successional Pennsylvania barrens species in open versus understory environments , 1993 .

[19]  S. T. Gower,et al.  A comparison of optical and direct methods for estimating foliage surface area index in forests , 1994 .

[20]  P. Stenberg,et al.  Performance of the LAI-2000 plant canopy analyzer in estimating leaf area index of some Scots pine stands. , 1994, Tree physiology.

[21]  Alain Royer,et al.  Measuring Leaf Area Index with the Li‐Cor LAI‐2000 in Pine Stands , 1994 .

[22]  Jing M. Chen,et al.  Quantifying the effect of canopy architecture on optical measurements of leaf area index using two gap size analysis methods , 1995, IEEE Trans. Geosci. Remote. Sens..

[23]  J. Cihlar,et al.  Plant canopy gap-size analysis theory for improving optical measurements of leaf-area index. , 1995, Applied optics.

[24]  A. Brunner.  A light model for spatially explicit forest stand models , 1996 .

[25]  J. Chen.  Optically-based methods for measuring seasonal variation of leaf area index in boreal conifer stands , 1996 .

[26]  P. Stenberg,et al.  Response of LAI-2000 estimates to changes in plant surface area index in a Scots pine stand. , 1996, Tree physiology.

[27]  P. Stenberg.  Correcting LAI-2000 estimates for the clumping of needles in shoots of conifers , 1996 .

[28]  S. T. Gower,et al.  Leaf area index of boreal forests: theory, techniques, and measurements , 1997 .

[29]  Sylvain G. Leblanc,et al.  A practical scheme for correcting multiple scattering effects on optical LAI measurements , 2001 .