Nitrogen and Phosphorus Characteristics and Influencing Factors in Water-Soil-Plant System in the Riparian Zone of the Sunxi River Watershed, Chongqing
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Nitrogen and Phosphorus Characteristics and Influencing Factors in Water-Soil-Plant System in the Riparian Zone of the Sunxi River Watershed, Chongqing
MENG Hai, WANG Haiyan, HOU Wenning, et al. Nitrogen and Phosphorus Characteristics and Influencing Factors in Water-Soil-Plant System in the Riparian Zone of the Sunxi River Watershed, Chongqing[J]. 2022, 36(2): 275-282.
DOI:
MENG Hai, WANG Haiyan, HOU Wenning, et al. Nitrogen and Phosphorus Characteristics and Influencing Factors in Water-Soil-Plant System in the Riparian Zone of the Sunxi River Watershed, Chongqing[J]. 2022, 36(2): 275-282. DOI: 10.13870/j.cnki.stbcxb.2022.02.035.
Nitrogen and Phosphorus Characteristics and Influencing Factors in Water-Soil-Plant System in the Riparian Zone of the Sunxi River Watershed, Chongqing
In order to clarify the characteristics of nitrogen and phosphorus and influencing factors in water-soil-plant system in the riparian zone of the Sunxi River watershed
Chongqing
the descriptive statistics
cluster analysis
correlation analysis and redundancy analysis were carried out to study the characteristics of nitrogen and phosphorus content and spatial distribution in water
soil and plants in the riparian zone of the small watershed at the end of the Three Gorges Reservoir
as well as to study the correlation between nitrogen and phosphorus in each sphere and the factors influencing nitrogen and phosphorus in water. The results showed that:(1) The riparian zone was affected by the river section. From upstream to downstream
the content of nitrogen and phosphorus in water and soil total nitrogen decreased first and then increased
while the content of nitrogen and phosphorus in the plant
soil nitrate nitrogen
total and available phosphorus gradually increased. There existed an obvious agricultural nitrogen input in the downstream. (2) The total nitrogen content in water was significantly positively related to the nitrogen content in different vegetative organs of plant (P<0.01). Total phosphorus content in water was significantly positively related to soil total and available phosphorus content (P<0.001)
and both soil total and available phosphorus content were significantly negatively related to altitude (P<0.001). (3) The content of nitrogen and phosphorus in riparian water were affected by the content of soil nitrogen and phosphorus
plant nitrogen and phosphorus and topography
and among them
soil nitrogen and phosphorus were the dominant factors. The permutation test of available phosphorus at soil depth of 20-40 cm
available phosphorus at 0-20 cm
total phosphorus at 20-40 cm
total phosphorus at 0-20 cm and nitrate nitrogen at 0-20 cm were all significant (P<0.05)
with the variation interpretation rate of 25.11%
21.71%
11.14%
8.13% and 3.05%
respectively. The river section had an impact on the content of nitrogen and phosphorus in the water
soil and plants in the riparian zone. From upstream to downstream
nitrogen and phosphorus gradually accumulated
but the difference decreased. Nitrogen and phosphorus in water
soil and plants had a certain correlation with each other
and were also affected by altitude
slope and aspect. Cultivated land was the main cause of agricultural non-point source pollution in the lower reaches of the river basin. It was necessary to strengthen the ability of plant protection and soil conservation in the middle and lower reaches
and to optimize the land use pattern in the riparian zone
so as to provide a basis for agricultural non-point source pollution control in small watersheds in the Three Gorges Reservoir area.
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