Improved estimation of nitrogen uptake in grasslands using the nitrogen dilution curve

Improved estimation of nitrogen uptake in grasslands using the nitrogen dilution curve
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使用氮稀释曲线改进草地氮吸收估计

DOI:
10.1007/s13593-015-0321-2
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发表时间:
2015
影响因子:
7.3
通讯作者:
Elsaesser
Elsaesser
中科院分区:
农林科学1区
文献类型:
--
作者:
Schellberg;Siebert;Elsaesser

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氮(N)稀释曲线是农民评估肥料使用效果的有用工具。N稀释曲线描述了随着生物量的增加,植物N的减少。这一概念在草原不同采伐制度下的适用性和稳健性尚未得到测试。我们对生物产量和氮浓度数据进行了主成分分析,以识别实验、气候和管理因素之间的关系。其次,对不同切割频率下的两个N稀释曲线参数进行了标定。我们利用校准的N稀释曲线、参考曲线和代表作物不同生理年龄的不同刈割制度,对四种不同方法的N吸收进行了比较。研究结果表明,剔除刈割频率信息高估了氮素吸收的价值。根据采伐频率对N稀释曲线进行校准,相对于观测值改进了N吸收估计值。因此,使用N稀释曲线和采伐制度信息可以更好地估计N的吸收。
The nitrogen (N) dilution curve is a useful tool for farmers to assess the effectiveness of fertilizer application. The N dilution curve describes the decrease in plant N as biomass increases. This concept has not yet been tested for its applicability and robustness under different cutting regimes in grasslands. We conducted a principal components analysis on biomass yield and N concentration data to discern relationships among experimental, climatic, and management factors. Next, two N dilution curve parameters were calibrated for different cutting frequencies. We compared N uptake using four different methods utilizing calibrated N dilution curves, a reference curve, and different cutting regimes representing different physiological ages of the crops at cutting. Our results show that excluding cutting frequency information overestimates values of N uptake. Calibration of the N dilution curve according to cutting frequency improves N uptake estimates relative to observed values. Therefore, N uptake is better estimated using both the N dilution curve and the cutting regime information.
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