{"title":"Nutrient loss from disturbed forest watersheds in Oregon's coast range","authors":"James H. Miller , Michael Newton","doi":"10.1016/0304-3746(83)90001-X","DOIUrl":null,"url":null,"abstract":"<div><p>Dissolved nutrients were monitored bi-weekly in stream water draining 14 upland watersheds in Oregon's Coast Range after spraying with 2,4,5-T + 2,4-D, clearcut harvesting and slash burning. Anion generation and leaching were primarily studied. The nitrate concentrations fell and the bicarbonate concentrations rose during summer low-flows from treated watersheds without detectable increases in loss of macronutrients (N, Ca, Mg, K, Na). The stream water concentrations of bicarbonate (the most prevalent anion) related to watershed orientation and the degree of devegetation. Nitrate concentrations appeared to be correlated positively with watershed drainage rates. Studies with incubated soils and field sampling of soil solution indicate that denitrification probably minimizes nitrate loss from saturated soils during frequent winter to spring storm periods.</p></div>","PeriodicalId":100066,"journal":{"name":"Agro-Ecosystems","volume":"8 3","pages":"Pages 153-167"},"PeriodicalIF":0.0000,"publicationDate":"1983-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0304-3746(83)90001-X","citationCount":"13","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Agro-Ecosystems","FirstCategoryId":"1085","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/030437468390001X","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
引用次数: 13
Abstract
Dissolved nutrients were monitored bi-weekly in stream water draining 14 upland watersheds in Oregon's Coast Range after spraying with 2,4,5-T + 2,4-D, clearcut harvesting and slash burning. Anion generation and leaching were primarily studied. The nitrate concentrations fell and the bicarbonate concentrations rose during summer low-flows from treated watersheds without detectable increases in loss of macronutrients (N, Ca, Mg, K, Na). The stream water concentrations of bicarbonate (the most prevalent anion) related to watershed orientation and the degree of devegetation. Nitrate concentrations appeared to be correlated positively with watershed drainage rates. Studies with incubated soils and field sampling of soil solution indicate that denitrification probably minimizes nitrate loss from saturated soils during frequent winter to spring storm periods.
在俄勒冈州海岸山脉14个高地流域喷洒2,4,5- t + 2,4- d、采伐和刀耕火种后,每两周监测溪流中溶解的营养物质。主要研究阴离子的产生和浸出。在处理过的流域夏季低流量期间,硝酸盐浓度下降,碳酸氢盐浓度上升,而常量营养元素(N、Ca、Mg、K、Na)的损失没有明显增加。碳酸氢盐(最常见的阴离子)的浓度与流域方向和植被退化程度有关。硝酸盐浓度与流域排水速率呈显著正相关。对孵育土壤和土壤溶液实地取样的研究表明,在频繁的冬季至春季风暴期间,反硝化可能使饱和土壤的硝酸盐损失最小化。