Temporal patterns in sediment, carbon, and nutrient burial in ponds associated with changing agricultural tillage

Temporal patterns in sediment, carbon, and nutrient burial in ponds associated with changing agricultural tillage
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与农业耕作变化相关的池塘沉积物、碳和养分埋藏的时间模式

DOI:
10.1007/s10533-022-00916-w
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发表时间:
2022
期刊:
影响因子:
4
通讯作者:
Vanni, Michael J.
Vanni, Michael J.
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Rogers, Martina N.;Williamson, Tanner J.;Knoll, Lesley B.;Vanni, Michael J.

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湖泊和池塘在保持沉积物、碳、氮和磷方面发挥着不成比例的作用,可能会减轻对环境的负面影响。然而,固碳率如何改变池塘的生命周期,以及如何率受流域土地利用的做法仍然很差的特点。在这项研究中,我们量化了沉积物,碳,氮,磷埋藏率,这些生态系统服务的价值,在三个池塘。这些池塘的年龄为19-25岁(截至2019年),其流域在20世纪90年代初经历了保护性耕作的转变。我们发现,随着时间的推移,这些池塘内的沉积物掩埋率下降(建立到2006年,与2006年至2019年),与保护性耕作相关的土壤侵蚀率降低一致。然而,碳、氮和磷的埋藏速率模式并不清楚;我们量化的元素埋藏速率中几乎有一半随着时间的推移而增加。我们认为,这可能是由于增加的重要性,在池塘的过程中,如原位初级生产和随后的有机物沉积,池塘的年龄。最后,我们估计的生态系统服务价值的沉积物,碳,养分的保留这些池塘。我们估计,这三个池塘提供的生态系统服务相当于约360,083美元,在他们的生命周期通过埋藏的沉积物,碳,氮和磷。我们的研究结果表明,小型蓄水池可以提供相当大的环境和经济价值的捕获和保留沉积物和营养物质。
Lakes and ponds play a disproportionate role in retaining sediment, carbon, nitrogen, and phosphorus, potentially mitigating negative environmental effects. However, how sequestration rates change over a pond’s lifetime, and how rates are affected by watershed land use practices remains poorly characterized. In this study, we quantified sediment, carbon, nitrogen, and phosphorus burial rates, and the values of these ecosystem services, in three ponds. The ponds were 19–25 years in age (as of 2019), and their watersheds experienced a shift in the early 1990s to conservation tillage. We found that sediment burial rates decreased over time within these ponds (establishment to 2006, vs. 2006 to 2019), consistent with reduced soil erosion rates associated with conservation tillage. However, patterns in carbon, nitrogen, and phosphorus burial rates were not as clear; almost half of the elemental burial rates we quantified increased over time. We suggest that this may be due to increased importance of in-pond processes, such as in situ primary production and subsequent organic matter sedimentation, as the ponds age. Finally, we estimated the ecosystem service value of sediment, carbon, and nutrient retention by these ponds. We estimate that these three ponds provided ecosystem services equal to approximately 360,083 US$ over their lifetimes through burial of sediment, carbon, nitrogen, and phosphorus. Our results show that small retention ponds can provide considerable environmental and economic value by trapping and retaining sediments and nutrients.
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