Effects of algae-derived organic matter source on sediment mineralization in the karst reservoir

doi:10.13745/j.esf.sf.2024.2.7

Abstract

Abstract:

In the karst reservoir, there are a lot of $\mathrm{HCO}_{3}^{-}$ in the water column, which can promote algae to function of biological carbon pump and lead the algae organic matter to be deposited under the water column. Meanwhile, algae organic matter is mineralized on the sediment suffer in order to affect the organic matter burial, carbon cycle of karst aquatic environment. To study effect and of algae-derived organic matter source on sediment mineralization, we selected the Dalongdong Reservoir as the object and analyzed carbon cycle stability of karst reservoir aquatic environment. The results revealed that: organic carbon in the surface sediment come from the algae source (20.9%-65%) and soil source (11.8%-53.4%), which organic carbon of algae source was mainly deposited on the downstream and soil source' was on the upstream. The potential mineralization on the upstream was higher than that on the downstream, because the mineralization process of organic carbon was influenced by organic source difference, especially algae-source; with biological carbon pumping effect and inorganic carbon protection, potential burial volume in the surface sediment of karst reservoir was higher than that in the karst soil, which showed that sediment structure in the karst reservoir was stable.

Key words: karst reservoir, algae-derived organic matter, mineralization process, inorganic carbon effect, carbon pool stability

CLC Number:

P642.25
Q948

HUANG Siyu, PU Junbing, PAN Moucheng, LI Jianhong, ZHANG Tao. Effects of algae-derived organic matter source on sediment mineralization in the karst reservoir[J]. Earth Science Frontiers, 2024, 31(5): 387-396.

Figures/Tables 9

Fig.1 Schematic diagram of sediment sampling locations in the Dalongdong Reservoir

Fig.2 TOC and TN contents, δ13Corg, δ15N and C/N in surface sediments of the Dalongdong Reservoir

Fig.3 Mineralization rate of organic carbon in the surface sediment of Dalongdong Reservoir (Red area represents the pre-culture period; Yellow area represents the early culture period; Blue area represents the middle culture period; Green area represents the late culture period)

Table 1 Logarithmic relationship between mineralization of organic carbon in the surface sediment and time

样品号	拟合回归方程	R²
B1	y=24.402-4.831ln x	0.69
B2	y=17.3-2.977ln x	0.68
B3	y=7.8066-1.014ln x	0.36
B6	y=36.964-7.746ln x	0.65
B7	y=44.216-9.8ln x	0.75
B8	y=38.278-8.4ln x	0.76
B9	y=27.778-5.843ln x	0.76

Fig.4 Cumulative mineralization of surface sediments in the Dalongdong Reservoir after 84 days

Table 2 Cumulative mineralization of organic carbon and kinetic equation parameters in surface sediments after 84 days of culturing

样品号	C_t/(mg·kg^-1)	C₀/(mg·kg^-1)	k/d^-1	T_1/2/d	C_t/C₀	C₀/TOC含量	R²
B1	560.37	753.88	0.015 1	45.93	0.74	0.051	0.991
B2	515.62	1 107.52	0.007 5	92.79	0.47	0.094	0.995
B3	333.21	1 356.52	0.003 4	204.47	0.25	0.134	0.997
B6	713.89	888.21	0.017 3	40.04	0.80	0.050	0.987
B7	712.88	794.18	0.024 8	27.94	0.90	0.042	0.990
B8	626.51	720.27	0.022 6	30.64	0.87	0.039	0.991
B9	530.73	596.87	0.021 4	32.45	0.89	0.032	0.985

Fig.5 Distribution of sources of C and N in surface sediments of the Dalongdong Reservoir (Source values are from [27])

Fig.6 Relative contribution rates of different sources to surface sediments in the Dalongdong Reservoir

Fig.7 Correlation analysis between C0, TOC content, absolute contribution of algae, and TIC content

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