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首页> 外文会议>International Drainage Symposium >The Effect of Sampling Frequency on the Accuracy of Nitrogen Load Estimates from Drained Loblolly Pine Plantations in Eastern North Carolina
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The Effect of Sampling Frequency on the Accuracy of Nitrogen Load Estimates from Drained Loblolly Pine Plantations in Eastern North Carolina

机译：采样频率对北卡罗来纳东部排水荒野松树种植园氮荷载估算准确性的影响

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摘要

Nutrient loading in drainage outflow is estimated from measured flows and nutrient concentrations in the drainage water. The loading function is ideally continuous, representing the product of continuously measured outflows and nutrient concentrationsin drainage water. However, loading is often estimated as the product of continuously measured outflow and nutrient concentrations measured at less frequent time intervals (weekly, monthly etc.). In this study we investigate the effects of sampling frequency and method on estimating the loading of nitrate nitrogen (N03-N) and total Kjeldahl nitrogen (TKN) from a drained loblolly pine plantation in Eastern North Carolina. The loading of N03-N and TKN computed from continuous flows and daily concentrations were compared to loadings computed from weekly, bi-weekly, and monthly discrete samples. In this study, the N03-N concentrations had a greater range than those of the TKN concentrations and had a more distinct relationship between concentrations and flow; consequently, the load estimation methods were less precise and more biased when estimating N03-N than when estimating TKN. If N03-N loads from small drained forest watersheds are going to be calculated from discrete samples, the sample interval should be well less than 7 days, probably in the range of 1 to 3 days. Load estimates for TKN may be acceptable from samples collected every 7 days.
机译：排水流出中的营养加载从排水水中的测量流量和营养浓度估计。装载功能理想地是连续的，代表连续测量的外流和营养浓度引流水的产物。然而，通常估计加载作为在较少频繁的时间间隔（每周，每月等）下测量的连续测量流出和营养浓度的产物。在这项研究中，我们研究采样频率和方法估算北卡罗来纳州东部排出的稀土松树植物硝酸氮（N03-N）和总Kjeldahl氮（TKN）的影响。将从连续流量和每日浓度计算的N03-N和TKN的加载与从每周，双周期和月度离散样本计算的负载进行比较。在这项研究中，N03-N浓度的范围比TKN浓度更大，并且在浓度和流动之间具有更明显的关系;因此，在估计N03-N时，负载估计方法比估计TKN时更精确，更偏置。如果来自小排水森林流域的N03-N负载将从离散样品计算，则样品间隔应少于7天，可能在1至3天的范围内。对于每7天收集的样本可以接受TKN的负载估计。

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