Citation:

PANGAEA.947825

Name: Carbon stocks and carbon accumulation rates of sediment cores in Clayoquot Sound, British Columbia, Canada
Published: 2022-08-31
License: https://creativecommons.org/licenses/by/4.0/
Keywords: 210Pb; blue carbon; carbon accumulation rates; carbon stocks; dry bulk density; loss on ignition; organic carbon; Pacific Canada; salt marsh; tidal wetland

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Abstract:

The goal of this project was to provide the first estimates of blue carbon stocks and carbon accumulation rates in the high and low marsh zones of salt marshes from the Pacific Coast of Canada, within the Clayoquot Sound UNESCO Biosphere Reserve and Pacific Rim National Park Reserve on the Pacific Coast of Canada. Sediment cores were collected using a simple percussion coring technique in which a 57-mm diameter, PVC vacuum tubing fitted with a plastic core catcher (AMS Inc.) was hammered into the ground until the depth of refusal. At the GBK location, a steel sledge corer (AMS Inc.) was used to extract four cores before mechanical problems required switching to the simpler percussion method.

This datafile provides a summary of the estimated C stocks and carbon accumulation rates for the thirty-four sediment cores that were collected from seven salt marshes during summer (June-September) 2016. The sediment type at the base of each core was recorded. We also recorded the deepest sediment depth at which peat was found, referred to as the depth of the “Peat Base.” This depth was used to estimate the C stock for the marsh. Compaction was measured as length of core penetration divided by the length of core recovered. Using the compaction factor, we provide estimates of “uncorrected” (using original core depths) and “corrected” (applying compaction factor) values for the dry bulk density (g/cm3) and soil carbon density (g C/cm3). We provide estimates of C stocks (a) to the peat base, (b) for the whole core, and (c) to the depth of the 30-year horizon in the eight cores for which we have measured 210Pb systematics. We calculated the mass of all carbon down to the base of the peat layer to estimate the C-stock to peat base for each core, and this calculation did not require use of the compaction factor. The “corrected” values were provided to facilitate comparison with other studies (and for calculating the 20-cm C stock). ArcMap 10.3 tools were used with 50 x 50 cm resolution aerial orthophotos (taken in July 2014, Government of British Columbia) to estimate the total marsh area for each marsh.

Keyword(s):

210Pb; blue carbon; carbon accumulation rates; carbon stocks; dry bulk density; loss on ignition; organic carbon; Pacific Canada; salt marsh; tidal wetland

Related to:

Chastain, Stephen; Kohfeld, Karen E; Pellatt, Marlow G; Olid, Carolina; Gailis, Maija (2022): Quantification of blue carbon in salt marshes of the Pacific coast of Canada. Biogeosciences, 19(24), 5751-5777, https://doi.org/10.5194/bg-19-5751-2022

Funding:

Natural Sciences and Engineering Research Council (NSERC), grant/award no. RGPIN342251

Coverage:

Median Latitude: 49.158301 * Median Longitude: -125.745918 * South-bound Latitude: 49.087560 * West-bound Longitude: -125.911000 * North-bound Latitude: 49.279350 * East-bound Longitude: -125.666020

Date/Time Start: 2016-01-01T00:00:00 * Date/Time End: 2016-09-16T00:00:00

Event(s):

CBE_1-1 (Cannery Bay East, Clayoquot Sound, British Columbi) * Latitude: 49.141390 * Longitude: -125.666200 * Date/Time: 2016-06-08T00:00:00

CBE_1-2 (Cannery Bay East, Clayoquot Sound, British Columbi) * Latitude: 49.141420 * Longitude: -125.666290 * Date/Time: 2016-06-08T00:00:00

CBE_1-3 (Cannery Bay East, Clayoquot Sound, British Columbi) * Latitude: 49.141470 * Longitude: -125.666360 * Date/Time: 2016-06-08T00:00:00

Comment:

CBE=Cannery Bay East

CBW = Cannery Bay West

CRF = Cypress River Flats

GBK = Grice Bay- Kootowis Creek

KCS = Kennedy Cove South

SWC = Shipwreck Cove

TMF = Tofino Mud Flats

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Location	Location		Kohfeld, Karen E	see comment	Name of marsch
2	Event label	Event		Kohfeld, Karen E		Core ID
3	Latitude of event	Latitude		Kohfeld, Karen E		Core ID
4	Longitude of event	Longitude		Kohfeld, Karen E		Core ID
5	Zone	Zone		Kohfeld, Karen E		marsh zone: high or low marsh
6	Sediment type	Sediment		Kohfeld, Karen E		soil type at the base of sediment core
7	Core length	Core length	cm	Kohfeld, Karen E	Uncorrected
8	Compaction factor	Comp fact		Kohfeld, Karen E		unitless factor based on the full core length (corrected_depth) divided by compacted core depth (uncorrected_depth)
9	Core length	Core length	cm	Kohfeld, Karen E	Corrected
10	Depth, peat base	Depth peat base	cm	Kohfeld, Karen E	Corrected	depth of deepest layer containing peat and overlying sand, gravel, or clay
11	Density, dry bulk	DBD	g/cm³	Kohfeld, Karen E	Calculated average/mean values	uncorrected, measured to peat base
12	Density, dry bulk	DBD	g/cm³	Kohfeld, Karen E	Calculated standard error (SE)	uncorrected, standard error (stdev/sqrt(n)) of averaged DBD to peat base
13	Density, dry bulk	DBD	g/cm³	Kohfeld, Karen E	Calculated average/mean values	corrected for compaction, measured to peat base
14	Density, dry bulk	DBD	g/cm³	Kohfeld, Karen E	Calculated standard error (SE)	corrected for compaction, standard error (stdev/sqrt(n)) of averaged DBD to peat base
15	Carbon	C	%	Kohfeld, Karen E	Calculated average/mean values	to depth of refusal, estimated from LOI using %C = 0.44(%LOI) -1.8
16	Carbon	C	%	Kohfeld, Karen E	Calculated average/mean values	to the base peat layer, percent carbon estimated from LOI using %C = 0.44(%LOI)-1.8
17	Carbon	C	%	Kohfeld, Karen E	Calculated standard error (SE)	standard error (stdev/sqrt(n)) of percent C to peat base
18	Carbon density, soil	SCD	g/cm³	Kohfeld, Karen E	Calculated average/mean values	to depth of refusal, corrected for compaction
19	Carbon density, soil	SCD	g/cm³	Kohfeld, Karen E	Calculated average/mean values	to base of peat layer, corrected for compaction
20	Carbon density, soil	SCD	g/cm³	Kohfeld, Karen E	Calculated standard error (SE)	standard error (stdev/sqrt(n)) of SCD to peat base
21	Area in hectare	Area	ha	Kohfeld, Karen E		area of marsh zone in which core was collected
22	Soil carbon stock	C stock	t/ha	Kohfeld, Karen E		to depth of refusal, Sum of partial carbon masses from each 1cm subsection from surface to DoR, MgC/ha
23	Soil carbon stock	C stock	t/ha	Kohfeld, Karen E		to base of peat, Sum of partial carbon masses from each 1cm subsection from surface to base of peat, MgC/ha
24	Soil carbon stock	C stock	t/ha	Kohfeld, Karen E		to 30 cm (corrected) depth
25	Soil carbon stock	C stock	t/ha	Kohfeld, Karen E		to 20 cm (corrected) depth
26	Soil carbon stock	C stock	t/ha	Kohfeld, Karen E		to shared 30 year horizon depth estimated by summing all partial carbon masses from each subsection to depth of 30 years
27	Accumulation rate per year	Acc rate	g/cm²/a	Kohfeld, Karen E		core's mass accumulation rate
28	Accumulation rate per year, standard deviation	Acc rate std dev	±	Kohfeld, Karen E
29	Sedimentation rate per year	SR	cm/a	Kohfeld, Karen E	Calculated average/mean values	mean linear sedimentation rate
30	Sedimentation rate per year, standard deviation	SR std dev	±	Kohfeld, Karen E
31	Accumulation rate, carbon, per year	Acc rate C	g/m²/a	Kohfeld, Karen E		30 yr CAR: carbon accumulation rate of 30 years prior to 2016; this calculation only uses %C values for the 30 year depth mark and above
32	Accumulation rate, carbon, per year, standard deviation	Acc rate C std dev	±	Kohfeld, Karen E		30 yr CAR SD: standard deviation of carbon accumulation rate for 30 years prior to 2016
33	Carbon	C	%	Kohfeld, Karen E		30 yr %C: mass percentage of carbon for 30 years prior to 2016, Calculated from the cumulative mass of carbon (relative to total mass) for the past 30 years
34	Accumulation rate, carbon, per year	Acc rate C	g/m²/a	Kohfeld, Karen E		basal peat CAR: carbon accumulation rate to basal age found at the depth of the deepest peat layer overlying sand/gravel
35	Accumulation rate, carbon, per year, standard deviation	Acc rate C std dev	±	Kohfeld, Karen E		basal peat CAR SD: standard deviation of carbon accumulation rate to depth of the deepest peat layer overlying sand/gravel
36	Carbon	C	%	Kohfeld, Karen E		basal peat %C: mass percentage of carbon to depth of the deepest peat layer overlying sand/gravel
37	Accumulation rate, carbon, per year	Acc rate C	t/a	Kohfeld, Karen E		basal (Mg C/y)
38	Accumulation rate, carbon, per year	Acc rate C	t/a	Kohfeld, Karen E		30 yr (Mg C/y)

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

834 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Location (Name of marsch, see comment)	2 Event (Core ID)	3 Latitude (Core ID)	4 Longitude (Core ID)	5 Zone (marsh zone: high or low marsh)	6 Sediment (soil type at the base of sedi...)	7 Core length [cm] (Uncorrected)	8 Comp fact (unitless factor based on the ...)	9 Core length [cm] (Corrected)	10 Depth peat base [cm] (depth of deepest layer contai...)	11 DBD [g/cm³] (uncorrected, measured to peat...)	12 DBD [g/cm³] (uncorrected, standard error (...)	13 DBD [g/cm³] (corrected for compaction, mea...)	14 DBD [g/cm³] (corrected for compaction, sta...)	15 C [%] (to depth of refusal, estimate...)	16 C [%] (to the base peat layer, perce...)	17 C [%] (standard error (stdev/sqrt(n)...)	18 SCD [g/cm³] (to depth of refusal, correcte...)	19 SCD [g/cm³] (to base of peat layer, correc...)	20 SCD [g/cm³] (standard error (stdev/sqrt(n)...)	21 Area [ha] (area of marsh zone in which c...)	22 C stock [t/ha] (to depth of refusal, Sum of p...)	23 C stock [t/ha] (to base of peat, Sum of parti...)	24 C stock [t/ha] (to 30 cm (corrected) depth)	25 C stock [t/ha] (to 20 cm (corrected) depth)	26 C stock [t/ha] (to shared 30 year horizon dep...)	27 Acc rate [g/cm²/a] (core's mass accumulation rate)	28 Acc rate std dev [±]	29 SR [cm/a] (mean linear sedimentation rat...)	30 SR std dev [±]	31 Acc rate C [g/m²/a] (30 yr CAR: carbon accumulatio...)	32 Acc rate C std dev [±] (30 yr CAR SD: standard deviat...)	33 C [%] (30 yr %C: mass percentage of ...)	34 Acc rate C [g/m²/a] (basal peat CAR: carbon accumu...)	35 Acc rate C std dev [±] (basal peat CAR SD: standard d...)	36 C [%] (basal peat %C: mass percentag...)	37 Acc rate C [t/a] (basal (Mg C/y))	38 Acc rate C [t/a] (30 yr (Mg C/y))
CBE	CBE_1-1	49.1414	-125.6662	high	sand/gravel/clay	47	0.760	62	50.1	0.320	0.037	0.243	0.028	19.8	23.4	1.8	0.0273	0.031	0.0013	1.42	169.3	158.7	98.3	62.9	107.7	0.1560	0.011	0.97	0.56	342.30	24.65	21.98	293.22	21.11	18.83	4.16	4.86
CBE	CBE_1-2	49.1414	-125.6663	high	peat/mud	38	0.950	40	39.0	0.309	0.030	0.293	0.029	17.0	17.0	1.9	0.0325	0.032	0.0019	1.42	129.9	129.9	102.8	78.0
CBE	CBE_1-3	49.1415	-125.6664	high	peat	24	1.000	24		0.148	0.012	0.148	0.012	28.3	28.3	1.6	0.0376	0.038	0.0008	1.42	90.3	90.3		79.2
CBE	CBE_1-4	49.1415	-125.6664	low	soil	14	1.000	14		0.154	0.010	0.154	0.010	23.5	23.5	1.5	0.0346	0.035	0.0018	2.57	48.4	48.4
CBE	CBE_1-5	49.1416	-125.6664	low	peat/soil	20	0.670	30		0.226	0.021	0.152	0.014	18.7	18.7	1.4	0.0285	0.029	0.0040	2.57	85.7	85.7	85.7	43.5	21.9	0.0346	0.010	0.17	0.06	69.72	20.89	20.13	73.37	21.98	21.19	1.89	1.79
CBE	CBE_2-2	49.1414	-125.6662	high	peat	30	1.000	30		0.160	0.014	0.160	0.014	30.3	30.3	1.0	0.0446	0.045	0.0020	1.42	133.8	133.8	133.8	86.7
CBE	CBE_2-3	49.1414	-125.6661	high	peat	40	1.000	40		0.119	0.006	0.119	0.006	28.4	28.4	1.0	0.0320	0.032	0.0006	1.42	132.1	132.1	101.1	65.7
CBE	CBE_2-4	49.1414	-125.6661	low	sand/gravel/clay	20	0.670	30	10.5	0.179	0.024	0.120	0.016	13.6	28.6	2.0	0.0233	0.033	0.0036	2.57	69.8	39.8	69.8	62.5
CBE	CBE_2-5	49.1415	-125.6660	low	sand/gravel/clay	30	1.000	30	5.0	0.767	0.056	0.767	0.056	1.1	1.9	0.5	0.0083	0.013	0.0029	2.57	9.0	9.0	9.2	9.2
CBW	CBW_1	49.1412	-125.6698	high	sand/gravel/clay	16	0.800	20	10.0	0.158	0.017	0.126	0.013	32.3	20.7	0.6	0.0267	0.026	0.0017	0.27	46.7	28.7	46.7	46.7
CBW	CBW_2	49.1412	-125.6698	low	sand/gravel/clay	16	0.700	23	5.7	0.266	0.061	0.186	0.043	15.0	15.9	3.3	0.0235	0.025	0.0029	0.23	23.5	17.8	23.5	23.5
CBW	CBW_3	49.1411	-125.6696	low	PEAT	7	1.000	7		0.165	0.004	0.165	0.004	13.4	32.3	1.8	0.0531	0.053	0.0031	0.23	84.9	84.9
CBW	CBW_4	49.1411	-125.6696	high	SAND/PEAT	24	0.800	30	27.5	0.157	0.023	0.126	0.018	17.1	17.8	1.7	0.0185	0.019	0.0020	0.27	56.3	53.6	55.6	47.4
CRF	CRF_1-1	49.2790	-125.9075	high	SAND/PEAT	38	0.830	46	44.8	0.168	0.008	0.139	0.006	26.9	26.9	1.1	0.0355	0.036	0.0013	17.31	163.4	163.4	113.0	81.7
CRF	CRF_1-2	49.2790	-125.9076	low	PEAT	16	0.530	30		0.168	0.009	0.089	0.005	28.7	28.7	1.0	0.0254	0.025	0.0013	10.11	76.1	76.1	76.1	57.8
CRF	CRF_2-1	49.2794	-125.9093	high	sand/gravel/clay	37	0.730	51	41.3	0.207	0.021	0.151	0.016	19.1	22.5	1.5	0.0247	0.028	0.0014	17.31	125.9	118.7	87.1	57.5	120.3	0.2420	0.025	1.57	0.80	394.16	41.13	16.32	351.73	36.70	14.56	60.88	68.23
CRF	CRF_2-2	49.2792	-125.9093	low	SAND/PEAT	26	0.680	38	36.5	0.205	0.025	0.139	0.017	25.3	25.3	1.9	0.0276	0.028	0.0009	10.11	104.8	104.8	93.0	66.7
CRF	CRF_3-1	49.2789	-125.9110	high	sand/gravel/clay	32	0.800	40	33.8	0.225	0.045	0.180	0.036	23.9	27.1	2.3	0.0292	0.032	0.0016	17.31	116.7	110.6	105.9	71.2
CRF	CRF_3-2	49.2788	-125.9109	low	sand/gravel/clay	23	0.770	30	26.1	0.192	0.023	0.148	0.018	23.3	27.4	2.3	0.0316	0.035	0.0021	10.11	94.8	85.7	94.7	72.3	27.2	0.0260	0.006	0.17	0.08	86.96	20.26	33.23	61.52	14.33	23.50	6.22	8.79
GBK	GBK_1-1	49.1414	-125.7324	high	sand/gravel/clay	46	0.523	88	23.0	0.232	0.032	0.121	0.017	6.1	18.3	3.2	0.0083	0.016	0.0012	6.90	73.0	41.0	47.5	35.2
GBK	GBK_1-2	49.0876	-125.7326	high	sand/gravel/clay	60	0.600	100	33.3	0.440	0.060	0.264	0.036	5.9	10.0	1.8	0.0096	0.015	0.0016	6.90	60.8	51.2	51.2	40.0	59.2	0.6980	0.033	1.76	1.37	189.45	9.00	2.72	386.16	18.35	5.53	26.64	13.07
GBK	GBK_1-3	49.0876	-125.7327	high	sand/gravel/clay	59	0.894	66	20.1	0.257	0.027	0.230	0.024	6.7	15.7	1.4	0.0239	0.032	0.0028	6.90	157.9	60.9	75.3	64.5
GBK	GBK_1-4	49.0877	-125.7328	low	sand/gravel/clay	24	0.650	37	17.0	0.298	0.017	0.194	0.011	6.0	12.0	0.8	0.0113	0.023	0.0009	4.79	41.6	41.6	41.6	41.6	19.1	0.0410	0.009	0.13	0.19	59.32	12.49	14.54	11.62	47.38	9.97	0.56	2.84
KCS	KCS_1-1	49.1370	-125.6708	high	sand/gravel/clay	24	0.770	31	20.7	0.227	0.041	0.175	0.032	17.9	21.4	2.1	0.0271	0.030	0.0045	0.47	73.5	66.2	73.5	66.2
KCS	KCS_1-2	49.1371	-125.6709	low	MUD/PEAT	14	0.670	21	13.5	0.248	0.074	0.166	0.050	15.0	15.0	6.9	0.0183	0.018	0.0012	0.32	27.4	27.4
KCS	KCS_1-3	49.1371	-125.6709	low	MUD/PEAT	16	0.440	36	24.8	0.427	0.097	0.188	0.043	11.1	11.1	9.5	0.0095	0.009	0.0016	0.32	25.6	25.6	25.6	24.0
KCS	KCS_1-4	49.1372	-125.6710	low	MUD/PEAT	10	0.500	20	18.0	0.296	0.085	0.148	0.042	14.7	14.7	2.2	0.0145	0.014	0.0012	0.32	28.9	28.9		28.9
KCS	KCS_1-5	49.1372	-125.6711	low	MUD/PEAT	10	0.830	12	10.8	0.509	0.125	0.423	0.104	7.6	7.6	2.1	0.0148	0.015	0.0029	0.32	17.8	17.8		17.8
SWC	SWC_1-1	49.1300	-125.6994	high	sand/gravel/clay	29	1.000	29	12.0	0.248	0.093	0.248	0.093	25.8	27.6	3.4	0.0313	0.033	0.0030	0.20	43.9	42.3	43.9	43.9
SWC	SWC_2-1	49.1301	-125.6991	high	MUD/PEAT	18	1.000	20		0.541	0.124	0.541	0.124	21.0	21.0	2.6	0.0667	0.067	0.0093	0.20	133.4	133.4		133.4
TMF	TMF_1-1	49.1301	-125.8869	high	sand/gravel/clay	27	0.600	45	21.7	0.326	0.068	0.195	0.041	11.0	18.6	3.4	0.0160	0.019	0.0012	0.82	72.1	45.4	57.4	42.8
TMF	TMF_1-2	49.1302	-125.8869	low	sand/gravel/clay	26	0.870	30	17.3	0.241	0.008	0.210	0.007	10.6	14.0	0.8	0.0301	0.038	0.0012	0.69	70.5	53.0	70.5	57.5	28.9	0.0580	0.007	0.36	0.27	87.55	9.97	15.12	79.52	9.06	8.42	0.55	0.60
TMF	TMF_2-1	49.1299	-125.8866	high	sand/gravel/clay	28	0.900	31	28.8	0.751	0.066	0.676	0.059	5.2	5.6	1.5	0.0212	0.022	0.0041	0.82	64.2	62.4	63.6	61.0	61.5	0.4960	0.022	1.00	0.80	193.06	8.43	3.89	181.80	7.94	3.67	1.49	1.58
TMF	TMF_2-2	49.1302	-125.8867	low	sand/gravel/clay	27	0.900	30	17.8	0.231	0.010	0.208	0.009	13.5	17.2	0.7	0.0301	0.035	0.0010	0.69	76.8	65.9	76.8	69.5