Estimation of storage and density of organic carbon in peatlands of China

Carbon dynamics of peatlands in China during the Holocene

“…One main reason of the relatively low value in the previous studies was probably that they ignored the carbon stored in buried peatlands and used 1 m peat soil depth in calculations (Xie, 2004;Yu et al, 2005), causing underestimation of the C storage in peatlands. Moreover, our estimation was also higher than that of 1.5 Pg which was based on peatland area, mean peat depth and mean bulk density (Liu et al, 2012b). The difference mainly stemmed from the higher estimation of 1.3 Pg C for Zoige peatlands in our study, much higher than that of 0.6 Pg C (Liu et al, 2012b) and 0.5 Pg C .Similarly, Yu et al (2010) used this new method to estimate northern peat C pools as 547 Pg C, higher than previous estimates of 270 Pg C (Turunen et al, 2002) and 450 Pg C (Gorham, 1991).…”

“…of 1000-year bin for each profile was calculated based on the dated depths of the profile; the dry bulk density and C content, for peatlands in the QTP, were calculated based on the measurements of seven peat profiles ; for peatlands in NEC, the average dry bulk density and C content were 0.20 g m À3 (Huang et al, 1988) and 12.7% g C g À1 dry weight (Huang, 1998;Liu et al, 2012b) respectively, based on all the values available. The C accumulation rate based on the method might not be accurate for a single peat profile since the bulk density and C content varied significantly in different peat profiles; however, it was proper to estimate the C accumulation rate of the whole region.…”

“…The total area of QTP is estimated to be 5086 km 2 , among which about 4600 km 2 (90%) distribute in Zoige (Sun and Zhang, 1987) and 486 km 2 scatter in other regions of QTP (Song et al, 1985;Sun et al, 1998;Liu et al, 2012b). We used 5086 km 2 in our calculations of peatland area and peat C pool changes in QTP.…”

“…So far much work about peatlands in China was focused on the formation and distribution patterns, mainly for the usage of peat resources (Chai, 1981;Ma et al, 1987). With ubiquitous warming and intensified anthropogenic activities, many studies tried to determine the peat carbon density and peat carbon storage (Wang, 2009;Wang et al, 2012;Liu et al, 2012b), and the accumulation rate of peat and carbon (Sun et al, 2001;Bao et al, 2010). They also tried to identify the influencing factors for peat accumulation (Large et al, 2009;Gao et al, 2010;Zhou et al, 2010).…”

Accurate calculation research on scattering characteristics of gap

“…Although anechoic chamber test has advantages in the accuracy and reliability of the results, it need to make lots of samples, high cost, long cycle; numerical calculation method designs short cycle and uses flexibility and conveniently. According to the existing literature [11][12][13][14][15][16], the main methods to study the scattering characteristics are: method of moment (MOM) [11], multilevel fast multipole algorithm (MLFMA) [12][13][14] or finite difference time domain method (FDTD) [15,16].…”