Relating rainfall, runoff, and sediment to phosphorus loss in northern rocky mountainous area of China

IF 5.4 1区农林科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY

Catena Pub Date : 2024-10-30 DOI:10.1016/j.catena.2024.108504

{"title":"Relating rainfall, runoff, and sediment to phosphorus loss in northern rocky mountainous area of China","authors":"","doi":"10.1016/j.catena.2024.108504","DOIUrl":null,"url":null,"abstract":"<div><div>As a notoriously ecologically fragile mountainous region, the northern rocky mountainous area of China is experiencing serious phosphorus loss due to its numerous sloping cultivated lands and abundant rainfall. Therefore, determining the relationships between rainfall, runoff, sediment, and the different components of phosphorus loss is essential for developing effective measures to control phosphorus loss. To address this issue, this study aimed to investigate the relative importance of rainfall, runoff, and sediment factors in the loss of different fractions of phosphorus using 32 natural rainfall events in a typical watershed in the northern rocky mountainous area of China. Because of the high interdependence among these influencing factors, a partial least square regression (PLSR) model was employed to quantify the relationship between phosphorus loss and its 15 influencing variables. First-order controls were identified by calculating the variable importance of projections (VIP). The results indicated that dissolved inorganic phosphorus (DIP) losses were the highest under heavy rain conditions, whereas dissolved phosphorus (DP) losses peaked during torrential rain. The trends in particulate phosphorus (PP) and total phosphorus (TP) were consistent, with large fluctuations in concentration under heavy rainfall conditions and an increase in concentration 30 min after rainfall under torrential rainfall conditions. Rainfall, runoff, and sediment characteristics exerted a substantial influence on the different components of phosphorus loss (93.33 %, 91.73 %, 94.2 %, and 95.3 % of DIP, DP, PP, and TP loss variability, respectively). From the VIP values, sediment, runoff, rainfall erosivity, rainfall kinetic energy, and 60 min maximum rainfall kinetic energy were the main first-order factors controlling the loss of the four phosphorus fractions. The PLSR method eliminated the interdependence among variables and facilitated the determination of factors influencing phosphorus loss. This study provides scientific support and decision-making references for formulating effective water resource and phosphorus pollution management strategies.</div></div>","PeriodicalId":9801,"journal":{"name":"Catena","volume":null,"pages":null},"PeriodicalIF":5.4000,"publicationDate":"2024-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Catena","FirstCategoryId":"97","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S034181622400701X","RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"GEOSCIENCES, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

As a notoriously ecologically fragile mountainous region, the northern rocky mountainous area of China is experiencing serious phosphorus loss due to its numerous sloping cultivated lands and abundant rainfall. Therefore, determining the relationships between rainfall, runoff, sediment, and the different components of phosphorus loss is essential for developing effective measures to control phosphorus loss. To address this issue, this study aimed to investigate the relative importance of rainfall, runoff, and sediment factors in the loss of different fractions of phosphorus using 32 natural rainfall events in a typical watershed in the northern rocky mountainous area of China. Because of the high interdependence among these influencing factors, a partial least square regression (PLSR) model was employed to quantify the relationship between phosphorus loss and its 15 influencing variables. First-order controls were identified by calculating the variable importance of projections (VIP). The results indicated that dissolved inorganic phosphorus (DIP) losses were the highest under heavy rain conditions, whereas dissolved phosphorus (DP) losses peaked during torrential rain. The trends in particulate phosphorus (PP) and total phosphorus (TP) were consistent, with large fluctuations in concentration under heavy rainfall conditions and an increase in concentration 30 min after rainfall under torrential rainfall conditions. Rainfall, runoff, and sediment characteristics exerted a substantial influence on the different components of phosphorus loss (93.33 %, 91.73 %, 94.2 %, and 95.3 % of DIP, DP, PP, and TP loss variability, respectively). From the VIP values, sediment, runoff, rainfall erosivity, rainfall kinetic energy, and 60 min maximum rainfall kinetic energy were the main first-order factors controlling the loss of the four phosphorus fractions. The PLSR method eliminated the interdependence among variables and facilitated the determination of factors influencing phosphorus loss. This study provides scientific support and decision-making references for formulating effective water resource and phosphorus pollution management strategies.

查看原文本刊更多论文

中国北部岩石山区降雨、径流和沉积物与磷流失的关系

中国北方石山区是著名的生态脆弱山区，由于坡耕地多、雨量充沛，磷流失严重。因此，确定降雨、径流、沉积物和磷流失不同组成部分之间的关系，对于制定有效的磷流失控制措施至关重要。针对这一问题，本研究以中国北部石山区典型流域的 32 次自然降雨事件为研究对象，探讨了降雨、径流和沉积物因素在不同磷流失组分中的相对重要性。由于这些影响因素之间存在高度的相互依赖性，因此采用了偏最小二乘法回归（PLSR）模型来量化磷流失与其 15 个影响变量之间的关系。通过计算预测变量重要性（VIP），确定了一阶控制因子。结果表明，在暴雨条件下，溶解性无机磷（DIP）的损失最大，而在暴雨条件下，溶解性磷（DP）的损失达到峰值。颗粒磷（PP）和总磷（TP）的变化趋势一致，在大雨条件下浓度波动较大，而在暴雨条件下，降雨 30 分钟后浓度有所上升。降雨、径流和沉积物特征对磷流失的不同成分有很大影响（分别占 DIP、DP、PP 和 TP 流失变化的 93.33%、91.73%、94.2% 和 95.3%）。从 VIP 值来看，泥沙、径流、降雨侵蚀率、降雨动能和 60 分钟最大降雨动能是控制四种磷组分流失的主要一阶因子。PLSR 方法消除了变量之间的相互依赖关系，有助于确定磷流失的影响因素。该研究为制定有效的水资源和磷污染管理策略提供了科学支持和决策参考。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Catena 环境科学-地球科学综合

CiteScore

10.50

自引率

9.70%

发文量

816

审稿时长

54 days

期刊介绍： Catena publishes papers describing original field and laboratory investigations and reviews on geoecology and landscape evolution with emphasis on interdisciplinary aspects of soil science, hydrology and geomorphology. It aims to disseminate new knowledge and foster better understanding of the physical environment, of evolutionary sequences that have resulted in past and current landscapes, and of the natural processes that are likely to determine the fate of our terrestrial environment. Papers within any one of the above topics are welcome provided they are of sufficiently wide interest and relevance.