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2 results for “low carbon agriculture”
Periphyton carbon and nitrogen stable isotopes detect agricultural stressors in low-order streams
<p>Shifts in the stable isotope signatures of carbon (C) and nitrogen (N) in ecological materials have the potential to indicate environmental disturbances. This study examined the δ<sup>13</sup>C‰ and δ<sup>15</sup>N‰ ratios of stream water and periphyton from low-order streams in a landscape influenced by agricultural activities. Our key purpose was to assess the influence of best management practice (BMP) presence and age on C and N isotope values as a potential water-quality assessment. We collected stream water and periphyton from 19 streams within the Upper Delaware River watershed in New York, USA, in each of 4 management categories: 1) recently applied BMP treatments, 2) long-standing BMPs, 3) streams lacking BMPs, and 4) minimally disturbed reference streams. We sampled and analyzed water and periphyton for δ<sup>13</sup>C‰ and δ<sup>15</sup>N‰ in a repeated-measures design (BMP category ´ time) from April to November 2013. There were large seasonal differences in stream water δ<sup>13</sup>C-dissolved organic C (DIC)‰ and δ<sup>15</sup>NO<sub>3</sub>-N‰, with strong differences between reference and agricultural streams. Periphyton δ<sup>13</sup>C‰ and δ<sup>15</sup>N‰ values also differed strongly across streams draining land with agricultural activities, with 85% higher periphyton δ<sup>15</sup>N‰ signals in all agricultural categories vs reference streams. Periphyton diatom and chlorophyte taxonomic proportions showed the strongest relationship with periphyton δ<sup>13</sup>C‰ values, where diatoms were negatively associated with increasing δ<sup>13</sup>C‰. These results suggest that aqueous and periphytic stable isotopes were sensitive in detecting persistent effects of agriculture on these streams despite BMP mitigation, where nutrient (orthosphosphate, nitrite, and ammonia) levels were non-indicative. These results also suggest that BMPs may not have fully eliminated the negative impacts of agricultural stressors on water quality in impacted streams.</p>
Periphyton carbon and nitrogen stable isotopes detect agricultural stressors in low-order streams
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