Conservation practice effectiveness and adoption: unintended consequences and implications for sustainable phosphorus management

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• 作者：R. J. Dodd ; A. N. Sharpley
• 关键词：Agricultural runoff ; Conservation practices ; Nutrient management ; Surface runoff ; Buffer zones ; Water quality
• 刊名：Nutrient Cycling in Agroecosystems
• 出版年：2016
• 出版时间：April 2016
• 年：2016
• 卷：104
• 期：3
• 页码：373-392
• 全文大小：506 KB
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• 作者单位：R. J. Dodd (1)
  A. N. Sharpley (1)
  
  1. Department of Crop, Soil and Environmental Sciences, University of Arkansas, Fayetteville, AR, USA
  
• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Soil Science and Conservation
  
• 出版者：Springer Netherlands
• ISSN：1573-0867

文摘

Phosphorus (P) runoff from agricultural land continues to receive attention due to a widespread lack of reduction in losses combined with a series of high profile P-induced harmful algal blooms. Many widely adopted conservation practices (CPs), aimed at reducing P loss, target particulate P (PP) through reductions in erosion or entrapment of P within the terrestrial landscape. However, there is increasing evidence that in time, these CPs may in fact increase dissolved P (DP) losses. We reviewed the effectiveness of current CPs promoted in the U.S., the results from long-term in-stream monitoring following implementation of conservation schemes and field studies investigating P loss from buffer zones designed to trap PP. These studies showed that different CPs are required to target different forms of P loss and the tendency for farmers to implement strategies targeting PP over DP resulted in an increase in dissolved reactive P export post-implementation of 37–250 % in three of the five catchment monitoring studies. Buffer zones, such as grass and vegetative filter strips, managed riparian zones and wetlands were found to accumulate labile forms of soil P over time and, in some studies, became significant sources of both inorganic and organic DP. Furthermore, often overlooked microbial processes appear to play a key role in P release. Consequently, to improve the effectiveness of future conservation schemes, practices need to specifically target DP losses in addition to PP and recognize that CPs trapping P within the landscape are at risk of becoming legacy P sources.