{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,9]],"date-time":"2026-01-09T15:45:15Z","timestamp":1767973515146,"version":"3.49.0"},"reference-count":36,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2017,4,28]],"date-time":"2017-04-28T00:00:00Z","timestamp":1493337600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"National Key Scientific and Technological Projects of the PRC","award":["2014ZX07104-005"],"award-info":[{"award-number":["2014ZX07104-005"]}]},{"name":"Fundamental Research Funds for the Central Universities of PRC","award":["JB2014129"],"award-info":[{"award-number":["JB2014129"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Water"],"abstract":"<jats:p>The Sichuan Basin is the main agricultural production area of the upper reaches of the Yangtze River and is also an extremely important ecological area because it is rich in biodiversity and has complex and diverse landscape types. The dominant soil type, purple soil, is prone to rapid soil erosion and weathering processes because it is shallow and rich in phosphorus and other nutrients. Field experiments were conducted to reveal the effects of precipitation and topography characteristics on nonpoint source pollutants from purple soil. The results showed that total phosphorus (TP) load and TP concentration both increased with increasing rainfall amount, and there was an initial time of runoff and sediment yield before runoff generation. Moreover, the TP load generally increased with precipitation intensity as setting a coincident value of rainfall amount; however, the difference between TP load at 30 and 60 mm\/h was minimal as was the difference between 90 and 120 mm\/h. Similarly, TP concentration increased with increasing precipitation intensity. In terms of topographical conditions, TP load increased with increasing gradient, but began to decline when the gradient was about 20\u00b0, which indicates that 20\u00b0 is the critical gradient for TP loss. There was a significant positive correlation between gradient and TP concentration when the gradient was &lt;15\u00b0, whereas the increase in TP concentration slowed as the gradient increased.<\/jats:p>","DOI":"10.3390\/w9050315","type":"journal-article","created":{"date-parts":[[2017,4,28]],"date-time":"2017-04-28T11:57:04Z","timestamp":1493380624000},"page":"315","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Effects of Precipitation and Topography on Total Phosphorus Loss from Purple Soil"],"prefix":"10.3390","volume":"9","author":[{"given":"Xiaowen","family":"Ding","sequence":"first","affiliation":[{"name":"Key Laboratory of Regional Energy and Environmental Systems Optimization, Ministry of Education, North China Electric Power University, Beijing 102206, China"},{"name":"Institute for Energy, Environment and Sustainable Communities, University of Regina, Regina, SK S4S 7H9, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ying","family":"Xue","sequence":"additional","affiliation":[{"name":"Key Laboratory of Regional Energy and Environmental Systems Optimization, Ministry of Education, North China Electric Power University, Beijing 102206, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ming","family":"Lin","sequence":"additional","affiliation":[{"name":"Key Laboratory of Regional Energy and Environmental Systems Optimization, Ministry of Education, North China Electric Power University, Beijing 102206, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yuan","family":"Liu","sequence":"additional","affiliation":[{"name":"Key Laboratory of Regional Energy and Environmental Systems Optimization, Ministry of Education, North China Electric Power University, Beijing 102206, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2017,4,28]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1262","DOI":"10.3390\/w5031262","article-title":"Recovery of N and P from Urine by Struvite Precipitation Followed by Combined Stripping with Digester Sludge Liquid at Full Scale","volume":"5","author":"Morales","year":"2013","journal-title":"Water"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"3085","DOI":"10.3390\/w6103085","article-title":"Linking Spatial Patterns of Groundwater Table Dynamics and Streamflow Generation Processes in a Small Developed Catchment","volume":"6","author":"Orlowski","year":"2014","journal-title":"Water"},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Wang, Z.W., Yang, S.T., Zhao, C.S., Bai, J., Lou, H.Z., Chen, K., Wu, L.N., Dong, G.T., and Zhou, Q.W. 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