Do different methods used to estimate soil phosphorus availability across Europe give comparable results?
Do different methods used to estimate soil phosphorus availability across Europe give comparable results?
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DOI：
10.1002/jpln.200321152
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发表时间：
2003-08-01
影响因子：
2.5
通讯作者：
Lischer, P
中科院分区：
文献类型：
--
作者：
Neyroud, JA;Lischer, P
每个欧洲国家都在使用自己的方法来确定植物的磷利用率，并对磷状况和肥料建议提出适当的解释方案。为了比较系统，组织了一个土壤交换项目：在12个国家的135种土壤上比较了16种磷肥方法。提取P的量按P-total > P-oxal的顺序递减。> P- al > P- me3 > P- bray > P- aaedta, P- dl, P- cal > P- olsen > P-纸（条），P- aaac, P- morgan > P- h2o, P- co2, P- cacl2，同位素交换P。在使用相同方法的实验室获得的结果中观察到很大的可变性，从而表明了作为任何比较的先决条件的相同实验室程序的重要性。传统的相关/回归方法在应用于非均匀分布的数据时显示出其局限性，并被更强大的技术所取代，这些技术显示了实验室差异偏差和对数转换值的置信区间。尽管在几次试验中，所有的方法对增加P的添加量都有相同的反应，但不同方法得到的结果存在很大差异。结果表明，试验土壤中约有50%的土壤缺磷。这一观察结果似乎与过去几十年欧洲普遍高磷施肥不符，并应导致对植物有效土壤磷的更好评价。
Each European country is using its own method for the determination of phosphorus availability to plants, together with an appropriate interpretation scheme of the P status and fertilizer recommendations. In order to compare systems, a soil exchange program was organized: 16 P methods were compared on 135 soils from 12 countries. The amount of extracted P decreased in the order P-total > P-oxal. > P-AL > P-Me3 > P-Bray > P-AAEDTA, P-DL, P-CAL > P-Olsen > P-paper (strip), P-AAAc, P-Morgan > P-H2O, P-CO2, P-CaCl2, Isotopically exchangeable P was also measured. A large variability was observed in the results obtained by laboratories using the same method, thus demonstrating the great importance of an identical lab procedure as a prerequisite to any comparison. The traditional correlation/regression approach revealed its limitations when applied to non-homogeneously distributed data and was replaced by more robust techniques that showed laboratory differential bias and confidence intervals of the log-transformed values. Even though all the methods reacted in the same way to increasing amounts of added P in several trials, there were wide differences between results obtained with different methods. The interpretation schemes for P status were also compared and revealed that about 50% of the tested soils were P-deficient. This observation appears not to be in line with a generally high P fertilization during the last decades in Europe and should lead to a better evaluation of the plant-available soil phosphorus.