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Effects of landscape pattern in riparian buffer on water nitrogen concentrations in the South Tiaoxi River
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Xue-bing CHEN1, 2, Shuo WANG3, 4, Fu-ping LIU1, 3, Xiao-xue MA5, 6, Lin-lin TIAN1, 3, 7, *, Jian CHEN1, 3, 7, Yan LI1, 3, Yan-jiang CAI1, 2
China Environmental Science | 2025, 45(4) : 1925 - 1938
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China Environmental Science | 2025, 45(4): 1925-1938
• Water Pollution Control •
Effects of landscape pattern in riparian buffer on water nitrogen concentrations in the South Tiaoxi River
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Xue-bing CHEN1, 2, Shuo WANG3, 4, Fu-ping LIU1, 3, Xiao-xue MA5, 6, Lin-lin TIAN1, 3, 7, *, Jian CHEN1, 3, 7, Yan LI1, 3, Yan-jiang CAI1, 2
Affiliations
  • 1.National Key Laboratory for Development and Utilization of Forest Food Resources, Zhejiang A&F University, Hangzhou 311300, China
  • 2.College of Environmental and Resource Sciences, Zhejiang A&F University, Hangzhou 311300, China
  • 3.College of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou 311300, China
  • 4.CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China
  • 5.College of Geosciences, Jiangsu Second Normal University, Nanjing 210013, China
  • 6.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 211135, China
  • 7.Tianmushan Forest Ecosystem National Orientation Observation and Research Station of Zhejiang Province, Hangzhou 311300, China
Published: 2025-04-20
Outline
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Based on field data from 2019 to 2022 in the South Tiaoxi River Watershed in the upper reaches of the Taihu Lake Basin, redundancy analysis (RDA) and non-parametric breakpoint analysis (nCPA) were employed to analyze the relationships between riverine nitrogen (N) concentrations and landscape pattern indices at different buffer scales, and identity the critical landscape threshold ranges affecting the river nitrate (NO3--N) concentration. The results showed that the total nitrogen (TN) concentration in the South Tiaoxi River exceeded the Class V surface water quality standard, with NO3--N as the predominant N pollutant. During the wet season, the concentrations of TN, dissolved total nitrogen (DTN), NO3--N, and dissolved organic nitrogen (DON) were significantly higher than those in the dry season, whereas ammonium nitrogen (NH4+-N) concentrations were lower. N concentrations were lower in the upstream compared to downstream. The landscape pattern indices in the buffer zones of 400m and 200m explained the largest variance in river N concentrations during the wet and dry seasons, respectively (89.49% and 90.97%). Based on the identified key thresholds of landscape pattern indices for significantly reducing the risk of NO3--N pollution in the watershed, the following suggestions are provided: the proportion of farmland, construction land, and Shannon diversity index (SDHI)in the buffer zone of 400m should be controlled within 0.25%, 1.75%, and 0.77, respectively; and the proportion of farmland and edge density (ED) in the buffer zone of 200m should be kept within 0.5% and 39m/hm2, simultaneously with the proportion of forest area exceeding 91.0%.

nitrate nitrogen (NO3--N)  /  riparian buffer  /  landscape composition  /  landscape configuration  /  threshold of landscape pattern index  /  scaling effect
Xue-bing CHEN, Shuo WANG, Fu-ping LIU, Xiao-xue MA, Lin-lin TIAN, Jian CHEN, Yan LI, Yan-jiang CAI. Effects of landscape pattern in riparian buffer on water nitrogen concentrations in the South Tiaoxi River[J]. China Environmental Science, 2025 , 45 (4) : 1925 -1938 .
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Year 2025 volume 45 Issue 4
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Article Info
  • Receive Date：2024-09-27
  • Online Date：2026-03-19
  • Published：2025-04-20
Article Data
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History
  • Received：2024-09-27
Funding
Affiliations
    1.National Key Laboratory for Development and Utilization of Forest Food Resources, Zhejiang A&F University, Hangzhou 311300, China
    2.College of Environmental and Resource Sciences, Zhejiang A&F University, Hangzhou 311300, China
    3.College of Forestry and Biotechnology, Zhejiang A&F University, Hangzhou 311300, China
    4.CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China
    5.College of Geosciences, Jiangsu Second Normal University, Nanjing 210013, China
    6.Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 211135, China
    7.Tianmushan Forest Ecosystem National Orientation Observation and Research Station of Zhejiang Province, Hangzhou 311300, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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