某石化水库植物群丛生物量与不同土层土壤理化性质研究

doi:10.12118/j.issn.1000－6060.2025.225

Abstract

Abstract:

A water reservoir had been constructed using a natural depression of the gobi desert—an arid region of Xinjiang, China—for a petrochemical enterprise. The industry discharged large quantities of treated wastewater into the reservoir, forming an artificial water body. This phenomenon created a unique wetland, remarkably altering soil-vegetation relationships within the surrounding desert ecosystem. This reclamation study employed soil profiling to investigate seven plant communities that typically border the reservoir and examine their influence on the soil’s physicochemical properties, including carbon-nitrogen-phosphorus stoichiometry and biomass. The results are summarized as follows: (1) Soil bulk density increased markedly with depth (1.28-1.72 g·cm^-3). Such an effect was most prominent within the 0-60 cm layer, induced by a Tamarix ramosissima-Phragmites australis symbiotic association, as these plants were under grazing pressure and had shallow root systems. Soil water content exhibited a “low in surface layers-high in deeper layers” distribution pattern. However, soils with slight alkalinity (pH 8.15-8.94) and low cation exchange capacity across the study area may induce base cation saturation, constraining water availability, a condition exacerbated by the limited abilities of the native vegetation to mitigate evaporation. Nutrient contents—total nitrogen, total phosphorus, and organic carbon—of the surface layer were enriched, as the T. ramosissima-P. australis symbiosis enhanced the nitrogen-fixing capacities of the individual species, facilitating soil nitrogen accumulation. (2) Stoichiometry revealed C:N, C:P, and N:P ratios of 6.45-9.07, 2.77-4.20, and 0.33-0.52, respectively, indicating a severely imbalanced state characterized by nitrogen limitation but relative phosphorus enrichment. (3) The T. ramosissima-P. australis association exhibited the highest biomass per unit area (39.67 t·hm^-2), which was significantly greater than that of the other associations (P<0.05). Redundancy analysis identified total nitrogen, soil water content, and bulk density as key driving factors, which explained 23.4%, 17.7%, and 21.4% of the variance, respectively. Thus, the wetlands created by the reservoir facilitated restoration of the native vegetation by improving soil-plant interactions. However, the salinity-induced imbalance in nitrogen-phosphorus stoichiometry and constrained water availability continued to limit ecological functioning. Thus, ecological restoration must prioritize the introduction of salt-tolerant and nitrogen-fixing species as well as optimization of soil water regulation strategies. These results serve as a scientific reference for rehabilitating other petrochemical industrial zones in Xinjiang by creating wetlands.

Key words: petrochemical reservoir, arid region, soil physicochemical properties, stoichiometric ratios, biomass

XU Wenzhao, ZHAO Dongfeng, LU Lei, DU Haibo, ZHAO Gongda, Mailidan MOTALIFU. Plant community biomass and soil physicochemical properties at different depths in a petrochemical reservoir[J].Arid Land Geography, 2026, 49(3): 559-568.

Figures/Tables 7

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References 34

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植物群丛	BD/g·cm^-3	SWC/%	pH	TN/g·kg^-1	TP/g·kg^-1	CEC/cmol·kg^-1	SOC/g·kg^-1
CK-1	1.41	9.54	7.98	0.31	0.77	9.82	1.92
CK-2	1.47	15.80	8.84	0.34	0.73	11.24	2.12

植物群丛	C:N	C:P	N:P	区域面积/hm²	单位面积生物量/t·hm^-2
多枝柽柳群丛	8.07±0.94bc	4.20±1.03a	0.52±0.08a	54.94	28.04b
多枝柽柳-芦苇群丛	7.63±0.44b	2.77±0.37b	0.45±0.06ab	14.83	39.67a
多枝柽柳-雾冰藜群丛	9.07±0.53c	3.14±0.79b	0.36±0.10c	11.07	10.92c
碱蓬-红砂群丛	8.86±1.14bc	2.88±0.86b	0.33±0.09c	86.61	0.97e
碱蓬-叉毛蓬群丛	6.45±1.37a	3.26±0.61b	0.34±0.10c	54.57	0.59e
盐爪爪群丛	8.97±0.74b	3.37±0.74b	0.38±0.10bc	162.76	0.12e
骆驼蓬群丛	7.76±0.47c	3.67±0.44b	0.48±0.06ab	52.09	6.00d

指标	生物量	C:N	C:P	N:P	BD	SWC	pH	TN	TP	CEC
C:N	-0.672^**	1.000	-	-	-	-	-	-	-	-
C:P	0.020	0.040	1.000	-	-	-	-	-	-	-
N:P	0.441^**	-0.522^**	0.822^**	1.000	-	-	-	-	-	-
BD	0.320	-0.210	-0.734^**	-0.471^**	1.000	-	-	-	-	-
SWC	0.423^*	-0.395^*	-0.477^**	-0.180	0.428^*	1.000	-	-	-	-
pH	0.210	-0.240	-0.461^**	-0.190	0.535^**	0.092	1.000	-	-	-
TN	0.361^*	-0.453^**	0.830^**	0.961^**	-0.554^**	-0.260	-0.320	1.000	-	-
TP	0.050	-0.160	0.522^**	0.510^**	-0.564^**	-0.240	-0.558^**	0.711^**	1.000	-
CEC	-0.190	0.081	-0.422^*	-0.413^*	0.220	0.307	0.282	-0.505^**	-0.553^**	1.000
SOC	0.031	-0.012	0.964^**	0.807^**	-0.751^**	-0.466^**	-0.541^**	0.891^**	0.732^**	-0.504^**

Plant community biomass and soil physicochemical properties at different depths in a petrochemical reservoir

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