Identifying the critical sources areas of non-point particulate phosphorus based on an index approach in R: A case study in red soil hilly micro-watershed
SU Jing-jun1, ZHAO Hong-tao1,3, JIAO Ru-yuan2,4, FANG Zhi-da1, YANG Xiao-jing1,5, LI Xu-yong1,3
1. Key Laboratory of Urban and Regional Ecology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; 2. Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; 3. University of Chinese Academy of Sciences, Beijing 100049, China; 4. Yangtze River Delta Branch, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Yiwu 322000, China; 5. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
Abstract:This study developed a watershed-scale non-point source (NPS) particulate phosphorus (PP) index based on R statistical language and applied it in a red soil hilly subbasin. The results indicated that watershed soil erosion rates ranged from 0.7 to 15244.2 t/(km2·a), and 59% of the watershed area exceeded the regional soil erosion threshold. The average watershed NPS PP load was 0.86 kg/hm2 and approximately 14% of the watershed area exceeded the NPS P loss threshold. Despite the fact that dominate soil erosions in the watershed were slight to mild, the small areas (7.2%) categorized as moderate to severe erosions contributed considerably larger shares to the total watershed loads of erosion and NPS PP loss (31%~43%). The critical sources areas (CSAs) for soil erosion and NPS PP loss were identified as 6.4 km2 in area, mainly consisting of wood land, crop land and orchard land, which were adjacent to streams (≤ 800m) and with low to gentle slopes (<25°). The soil P enrichment due to excessive fertilization, as well as the high erosion potential facilitated the formation of these CSAs. The CSAs were further divided into zones according to land uses, hydrological distances and slopes, on which different management practices and strategies were recommended to target the erosion and NPS PP loss.
苏静君, 赵洪涛, 焦茹媛, 房志达, 杨晓晶, 李叙勇. 基于R语言的非点源颗粒态磷指数构建及应用——以丘陵红壤区小流域为例[J]. 中国环境科学, 2021, 41(4): 1868-1877.
SU Jing-jun, ZHAO Hong-tao, JIAO Ru-yuan, FANG Zhi-da, YANG Xiao-jing, LI Xu-yong. Identifying the critical sources areas of non-point particulate phosphorus based on an index approach in R: A case study in red soil hilly micro-watershed. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(4): 1868-1877.
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