首页|Carbon density and distribution of six Chinese temperate forests
Carbon density and distribution of six Chinese temperate forests
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Quantifying forest carbon (C) storage and distribution is important for forest C cycling studies and terrestrial ecosystem modeling. Forest inventory and allometric approaches were used to measure C density and allocation in six representative temperate forests of similar stand age (42-59 years old) and growing under the same climate in northeastern China. The forests were an aspen-birch forest, a hardwood forest, a Korean pine plantation, a Dahurian larch plantation, a mixed deciduous forest, and a Mongolian oak forest. There were no significant differences in the C densities of ecosystem components (except for detritus) although the six forests had varying vegetation compositions and site conditions. However, the differences were significant when the C pools were normalized against stand basal area. The total ecosystem C density varied from 186.9 tC hm-2 to 349.2 tC hm-2 across the forests. The C densities of vegetation, detritus, and soil ranged from 86.3-122.7 tC hm-2, 6.5-10.5 tC hm-2, and 93.7-220.1 tC hm-2, respectively, which accounted for 39.7% ± 7.1% (mean ± SD), 3.3% ± 1.1%, and 57.0% ± 7.9% of the total C densities, respectively. The overstory C pool accounted for ＞ 99% of the total vegetation C pool. The foliage biomass, small root (diameter ＜ 5mm) biomass, root-shoot ratio, and small root to foliage biomass ratio varied from 2.08-4.72 tC hm-2, 0.95-3.24 tC hm-2, 22.0%-28.3%, and 34.5%-122.2%, respectively. The Korean pine plantation had the lowest foliage production efficiency (total biomass/foliage biomass: 22.6 g g-1) among the six forests, while the Dahurian larch plantation had the highest small root production efficiency (total biomass/small root biomass: 124.7 g g-1). The small root C density decreased with soil depth for all forests except for the Mongolian oak forest, in which the small roots tended to be vertically distributed downwards. The C density of coarse woody debris was significantly less in the two plantations than in the four naturally regenerated forests. The variability of C allocation patterns in a specific forest is jointly influenced by vegetation type, management history, and local water and nutrient availability. The study provides important data for developing and validating C cycling models for temperate forests.
biomasscarbon storagecarbon poolcarbon allocationroot-shoot ratio
ZHANG QuanZhi、WANG ChuanKuan
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College of Forestry, Northeast Forestry University, Harbin 150040, China
This research was financially supported by the grants from the National Natural Science Foundation of ChinaSpecial Research Program for Public-welfare ForestryMinistry of Science and Technology of China
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