DOI: 10.5061/dryad.mpg4f4r05
title: Annual mortality and growth index for 17 tree species across entire size classes in the Ogawa Forest Reserve, an old-growth deciduous forest, central Japan

description: We estimated demographic parameters across entire size classes for 17 tree
 species (Betula, Carpinus, Fagus, Quercus, Castanea, Acer, Cerasus, Swida,
 Kalopanax, and Styrax) using a dataset over 18 years obtained from the
 Ogawa Forest Reserve, an old-growth deciduous forest located in the
 southern part of the Abukuma Mountains, Ibaraki Prefecture, central Japan
 (36° 56', 140° 35', 610 m in elevation) 1). Size classes were
 represented by 12 categories defined based on age, height, and diameter at
 breast height (DBH): new seedling (age &lt; 1), aged seedling (age ≥ 1
 and height &lt; 30 cm), sapling (height 30 cm to 2 m), juvenile
 (height ≥ 2 m and DBH &lt; 5 cm), D10 (DBH 5–15 cm, D10 was denoted by
 the midpoint of this range; later classes were similarly defined), D20,
 D30, D40, D50, D60, D70, and D80 (including trees with DBH ≥ 85 cm). We
 derived the annual mortality and growth index (i.e., the probability of a
 living tree transitioning to the next size class) for each species and
 size class using estimates of transition probabilities between size
 classes (i.e., stasis, progression and retrogression)2). The stem
 densities of these 17 species in each size class are also presented3).
 File list 1) dataset - number of trees stagnating, progressing and
 retrogressing by size class.csv 2) estimates - mean and 95 percent
 credible intervals of demographic parameters by species and size class.csv
 3) estimates - mean density of stems by species and size class.csv
description: The study site was located in the Ogawa Forest
 Reserve, an old-growth deciduous forest located in the southern part of
 the Abukuma Mountains, Ibaraki Prefecture, central Japan (36° 56',
 140° 35', 610 m in elevation). The mean monthly temperature is
 10.7°C, with a high of 22.6°C in August and a low of −0.9°C in February.
 Annual precipitation is approximately 1,910 mm; August and September are
 the wettest months and December and January are the driest. Maximum snow
 depth often reaches 50 cm. The dominant soil types are Andic Haplumbrepts
 and others (e.g., Andic Dystrochrepts). The forest canopy is mostly
 closed; only 9–15% of the canopy was gap at the time of this
 study. We make available here
 3 files. Details of the field methods and the analysis are described in
 the journal article. 1) Data
 used in the study. The number of trees for each species, size class and
 year is shown with their fates during the measurement
 period. 2) The mean density
 (ha<sup>-1</sup>) of stems at each size class averaged over
 the study period. Size classes were defined as follows: new seedling (age
 &lt; 1 year), aged seedlings (age ≥ 1 year and height &lt; 30 cm),
 saplings (height of 30 cm to 2 m), juvenile (height ≥ 2 m and DBH &lt;
 5 cm), and D10 (DBH 5 cm to 15 cm). Stems with DBH ≥ 15 cm at D10 cm were
 similarly defined. The largest class, D80, includes stems of ≥ 85 cm DBH.
 For size classes from seedling to juvenile, data of 1987-1989 were not
 used because of the limited sample sizes.
 3) Estimated annual probabilities of stasis,
 progression, and retrogression and derived mortality and growth values by
 species and size class. The 95% confidence intervals are also provided.
 The rightmost column indicates the total sample size for each species and
 each size class summed over the study period.<br>
 <br> <br> On June 18, the second file
 "mean_and_credible_intervals_of_estimates_and_derivatives_to_prepare.csv" have been replaced with "mean_and_credible_intervals_of_estimates_and_derivatives_to_prepare_corrected.csv" where mortality values at specific maximum life stages have been corrected