Spatial Variation of Soil Inorganic Carbon Reserves of Typical Estuarine Wetlands in Jiaozhou Bay, China

doi:10.5814/j.issn.1674-764X.2019.01.011

Abstract

Abstract:

The storage of inorganic carbon in estuarine wetlands is of great significance for mitigating global warming. The Dagu River estuary and Yanghe River estuary of Jiaozhou Bay were selected as sampling areas, and data analysis was carried out by Duncan method to explore the distribution characteristics and influencing factors of soil inorganic carbon (SIC) reserves. The results showed that increasing distance from the estuary led to higher reserves in the mudflat along the coastal zone. The scouring action of seawater bodies was the main factor driving this distribution. In the vertical section, the SIC reserves in 40-60 cm depth were relatively high, accounting for 34.11% of the 0-60 cm soil depth, and resulting from the transport of water and salt in seawater. In the river flat along the vertical coastal zone, the SIC reserves first decreased and then increased with increasing distance from the sea, and the SIC reserves in 0-20 cm depth were relatively high in the vertical section, accounting for 38.18% of the 0-60 cm soil depth. These reserves were affected by synergetic factors such as oceanic factors and anthropogenic activities. The invasion of Spartina alterniflora decreased the SIC reserves of wetlands, mainly due to its root transformation and the differences of growth characteristics and years being the main reasons for the observed decreases. Aquaculture activities changed the physical and chemical properties of the soil in aquaculture ponds, and consequently changed the distribution of SIC reserves.

Key words: wetland soil, soil inorganic carbon, Spartina alterniflora, aquaculture pond

SUI Xiaomin,PANG Mingyue,LI Yue,WANG Xiaotong,KONG Fanlong,XI Min. Spatial Variation of Soil Inorganic Carbon Reserves of Typical Estuarine Wetlands in Jiaozhou Bay, China[J]. Journal of Resources and Ecology, 2019, 10(1): 86-93.

Figures/Tables 8

Fig. 1 Distribution of sampling sites in the Jiaozhou Bay

Table 1 Statistics of SIC reserves in the different types of wetlands

Sampling site	Maximum (kg m^-2)	Minimum (kg m^-2)	Mean (kg m^-2)	Standard deviation	Variation coefficient (%)	Kurtosis	Skewness
Mudflat	0.8462	0.4792	0.6946	0.0971	13.97	0.0494	-0.6346
River flat	0.9288	0.4076	0.6691	0.1478	22.08	-0.9929	0.0520
Spartina alterniflora	0.6599	0.4193	0.5421	0.0944	17.41	-1.4547	0.0502
Aquaculture ponds	0.8751	0.6842	0.7911	0.0680	8.59	-0.9152	-0.6225

Fig. 2 Horizontal variation of SIC reserves in the mudflat

Fig. 3 Horizontal variation of SIC reserves and salt content (St) in the river flatNote: 0 km is the critical point of the sea tide for submerging the soil during sampling.

Fig. 4 Profile variation of SIC reserves in the mudflat (A) and river flat (B)Note: CV is Variation coefficient

Fig. 5 Horizontal variation of SIC reserves in the Spartina alterniflora marsh and nearby mudflat

Fig. 6 Profile variation of SIC reserves in the Spartina alterniflora marsh (A) and aquaculture ponds (B)CV: Variation coefficient

Fig. 7 Horizontal variation of SIC reserves in the aquaculture ponds and nearby mudflat

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