Accumulation ability and bioremediation potential of water dropwort on nine elements in livestock and poultry breeding wastewater

doi:10.3969/j.issn.1004-1524.2021.08.15

Acta Agriculturae Zhejiangensis ›› 2021, Vol. 33 ›› Issue (8): 1477-1488.DOI: 10.3969/j.issn.1004-1524.2021.08.15

• Environmental Science • Previous Articles Next Articles

Accumulation ability and bioremediation potential of water dropwort on nine elements in livestock and poultry breeding wastewater

ZHAO Huijun¹^,²(), YAO Dongrui²^,³, SUN Linhe²^,³, CUI Jian²^,³, CHANG Yajun²^,³^,^*(), CAO Jianjun¹^,^*()

1. College of Geography and Environmental Science, Northwest Normal University, Lanzhou 730070, China
2. Institute of Botany, Jiangsu Province and Chinese Academy of Sciences, Nanjing 210014, China
3. Jiangsu Engineering Research Center of Aquatic Plant Resources and Water Environment Remediation, Nanjing 210014, China

Received:2020-12-21 Online:2021-08-25 Published:2021-08-27
Contact: CHANG Yajun,CAO Jianjun

Abstract

Abstract:

To clarify the absorption and accumulation ability to elements in livestock and poultry breeding wastewater and the bioremediation potential of water dropwort, an in-situ experiment was performed with livestock and poultry breeding wastewater as a nutrient source to study the dynamic changes of 9 elements (C, N, P, K, Ca, Na, Mg, Fe, Zn), stoichiometric characteristics, accumulation of nitrogen and phosphorus, etc, in different organs of water dropwort at different growth stages. It was shown thatthe average mass fraction of C (542.46 g·kg ^-1), N (41.35 g·kg^-1) and P (7.03 g·kg^-1) of water dropwort were 1.5, 1.6 and 2.1 times of those of aquatic plants in inland waters of China, respectively. The total N and P accumulation of the water dropwort were 165.90 g·m^-2 and 119.7 g·m^-2, respectively, which was higher than that of water hyacinth.The highest mass fraction of K was found in the stem of water dropwort, while Ca, Na, Mg, Fe and Zn were enriched in the root. The mass fraction of N in leaves was higher than that in the root and stem, and the comprehensive accumulation index of nine elements in leaves was significantly(P<0.05) higher than that in root and stem.In water dropwort, the C∶N was 9.42-18.55, and the C∶P was 48.82-194.72, which were lower than the global average level. The correlation between N content and C∶N, P content and C∶P decreased with the growth of water dropwort. The N∶P of water dropwort was 3.59-10.56 (<14), indicating that the growth of water dropwort was still limited by N under the expeirment condition.The results informed that the water dropwort with strong accumulation capacity for N and P in livestock and poultry breeding wastewater is an ideal green plant for the restoration of heavily eutrophic water.

Key words: livestock and poultry breeding wastewater, nutrient elements, stoichiometric characteristics, accumulation of nitrogen, accumulation of phosphorus

CLC Number:

X713

ZHAO Huijun, YAO Dongrui, SUN Linhe, CUI Jian, CHANG Yajun, CAO Jianjun. Accumulation ability and bioremediation potential of water dropwort on nine elements in livestock and poultry breeding wastewater[J]. Acta Agriculturae Zhejiangensis, 2021, 33(8): 1477-1488.

Figures/Tables 8

Table 1 Comparison of N and P accumulation of water dropwort (Oenanthe javanica) and water hyacinth(Eichhornia crassipes)

植物 Plant	生物量Biomass/(kg·m^-2)		N累积量 N accumulation/ (g·m^-2)	P累积量 P accumulation/ (g·m^-2)
植物 Plant	地上部 Aboveground part	地下部 Underground part	N累积量 N accumulation/ (g·m^-2)	P累积量 P accumulation/ (g·m^-2)
水芹Oenanthe javanica	16.5	13.5	165.90	119.70
凤眼莲Eichhornia crassipes	7.08~46.95	5.79~38.42	11.04~144.90	0.93~36.10

Fig.1 Mass fraction of C, N and P in water dropwort at different growth stages Bars marked without the same letters for the same organ indicated significant difference at P<0.05 within samples collected at different development stages. The same as below.

Fig.2 Mass fraction of mineral nutrition elements in water dropwort at different growth stages

Table 2 Bioaccumulation factor (BF) and translocation factor (TF) of elements at mature stage of water dropwort

指标Index	N	P	K	Ca	Na	Mg	Fe	Zn
BF	3.27	1.04	1.26	0.22	0.05	0.17	10.35	0.23
TF-S	0.79	1.15	2.98	0.30	0.32	0.81	0.04	0.52
TF-L	1.19	1.07	1.79	0.55	0.32	0.86	0.12	0.54

Fig.3 Element accumulation index (EAI) of water dropwort at mature stage

Fig.4 Stoichiometric characteristics ofwater dropwort at different development stages

Table 3 Correlation analysis of C, N, P content and stoichiometric ratio of water dropwort at different growth stages

发育阶段 Development stage	指标 Index	N	P	C∶N	C∶P	N∶P
幼苗期Seedling stage	C	0.018	-0.510	0.376	0.656	0.666
	N	—	0.567	-0.917^**	-0.458	-0.257
	P	—	—	-0.718^*	-0.960^**	-0.921^**
	C∶N	—	—	—	0.681^*	0.498
	C∶P	—	—	—	—	0.973^**
成长期Growing stage	C	0.737^*	-0.216	0.048	0.969^**	0.726^*
	N	—	-0.221	-0.703^*	0.730^*	0.981^**
	P	—	—	0.073	-0.448	-0.401
	C∶N	—	—	—	-0.063	-0.683^*
	C∶P	—	—	—	—	0.765^*
成熟期Mature stage	C	0.826^**	-0.337	0.054	0.947^**	0.769^*
	N	—	-0.511	-0.512	0.862^**	0.966^**
	P	—	—	0.411	-0.618	-0.713^*
	C∶N	—	—	—	-0.099	-0.547
	C∶P	—	—	—	—	0.884^**

Fig.5 Correlation of various elements in different organs of water dropwort Black means negative correlation, the closer the color is, the closer the correlation is to-1.Gray means positive correlation, the closer the color is, the closer the correlation is to 1.From black to gray means r value from-1 to 1, and white means no significant correlation.“R” stands for root, “S” stands for stem, and “L” stands for leaves.

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Accumulation ability and bioremediation potential of water dropwort on nine elements in livestock and poultry breeding wastewater

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