ISSN 10674136, Russian Journal of Ecology, 2015, Vol. 46, No. 1, pp. 51–58. © Pleiades Publishing, Ltd., 2015.
As a main component of terrestrial ecosystems,
almost 90% of total biomass on the earth is tied up in
forests (Monteiro et al., 2009). Forest plays a signifi
cant role in this carbon (C) sink (Wang et al. 2009).
Carbon distribution in forest ecosystems is an impor
tant part of the global carbon budget (Jia and
Akiyama, 2005). To accurately and precisely quantize
the C in forests has attracted global attention as coun
tries seek to comply with agreements under the UN
Framework Convention on Climate Change (Brown,
2002; Rodeghiero et al., 2010; Sharma et al., 2010).
Forest inventory data are usually used to estimate car
bon stocks (Sharma et al., 2010; Tuyl et al., 2005;
Woodbury et al., 2007). Unfortunately, being short of
enough information, the understory carbon sequestra
tion was scarcely estimated.
Understory vegetation species in natural secondary
forests usually grow profusely in the Qinling Moun
tains, China. Does the carbon sink intensity of the
whole forest ecosystem hardly vary when the under
story carbon storage is omitted?
In this study we set out to qualify impacts of each
component’s (arbor, shrub and herbage) carbon stor
age on carbon sequestration of a natural secondary
forest in the Qinling Mountains,
China. Our main objectives were to quantify the
understory C pool and report biomass equations for
this forest type.
The article is published in theoriginal.
2. METHODS AND MATERIALS
2.1. The Site Condition
The study was conducted in comprehensive obser
vation plots, Qinling National Forest Ecosystem
Research Station (QNFERS) at Huoditang, Nings
han, Shaanxi, China (33
E). The alti
tude is 1530–1610 m. The area has a warm temperate
climate. The annual mean temperature is 8–10
annual mean precipitation is 900–1200 mm and
annual mean evaporation is 800–950 mm. The soil is
mountain brown generated from granite and degener
ative granite parent material and soil depth ranged
from 30 cm to 50 cm. Forest in the comprehensive
observation plots were selective cut in 1951. The
present common tree species include 60–year–old
species, such as
, etc. The main understory plant species are
2.2. Field Investigation
There are 14 comprehensive observation plots in
the QNFERS along the altitude and area of each plot
is 400 m
20 m). Height and DBH (diameter
at height of breast) of arbor species in the plot was
measured from September 25th to 30th in 2006 and
Effect of Understory on a Natural Secondary Forest Ecosystem
, Weimin Xi
, and Shuoxin Zhang
College of Forestry, Northwest A&F University, 3 Taicheng Road, Yangling, Shaanxi 712100 China
Qinling National Forest Ecosystem Research Station, 3 Taicheng Road, Yangling, Shaanxi 712100 China
Department of Biological and Health Sciences, Texas A&M UniversityKingsville, Kingsville, Texas 78363 U.S.A.
Received June 4, 2014
—Lacking of detail data, forest carbon stock estimation with forest inventory data usually excludes
or underestimates understory carbon storage. To quantify the effects of understory on carbon sequestration in
a natural secondary
forest, organ biomass models for arbor, shrub to their growth indices
were regressed. Biomass of herbage was estimated in a stratified sampling method. Soil respiration in forest
land was measured. Based on above data, carbon budget of
forest was assessed as
, 37.04% of the entire vegetation’s yearly net carbon storage belonging to understory.
: understory, carbon sequestration, carbon storage, soil respiration, carbon budget