Fang Jing, Wen Bei, Shan Xiao-quan, Lin Jin-ming, Owens Gary
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, P.O. Box 2871, Beijing 100085, China.
Environ Pollut. 2007 Nov;150(2):209-17. doi: 10.1016/j.envpol.2007.01.019. Epub 2007 Apr 10.
Previously recommended rhizosphere-based method (RHIZO) applied to moist rhizosphere soils was integrated with moist bulk soils, and termed adjusted-RHIZO method (A-RHIZO). The A-RHIZO and RHIZO methods were systematically compared with EDTA, DTPA, CaCl2 and the first step of the Community Bureau of Reference (BCR1) methods for assessing metal phytoavailability under field conditions. Results suggested that moist bulk soils are equally suited or even better than rhizosphere soils to estimate metal phytoavailability. The A-RHIZO method was preferred to other methods for predicting the phytoavailability of Ni, Cu, Zn, Cd, Pb and Mn to wheat roots with correlation coefficients of 0.730 (P<0.001), 0.854 (P<0.001), 0.887 (P<0.001), 0.739 (P<0.001), 0.725 (P<0.001) and 0.469 (P<0.05), respectively. When including soil properties, other extraction methods were also able to predict phytoavailability reasonably well for some metals. Soil pH, organic matter and Fe-Mn oxide contents, and cation-exchange capacity mostly influenced the extraction and phytoavailability of metals.
先前推荐的应用于湿润根际土壤的基于根际的方法（RHIZO）与湿润的原状土壤相结合，并称为调整后的RHIZO方法（A-RHIZO）。在田间条件下，系统地比较了A-RHIZO和RHIZO方法与EDTA、DTPA、CaCl2以及欧洲共同体标准局第一步（BCR1）方法对金属植物有效性的评估。结果表明，湿润的原状土壤在估计金属植物有效性方面同样适用甚至优于根际土壤。在预测镍、铜、锌、镉、铅和锰对小麦根系的植物有效性方面，A-RHIZO方法优于其他方法，相关系数分别为0.730（P<0.001）、0.854（P<0.001）、0.887（P<0.001）、0.739（P<0.001）、0.725（P<0.001）和0.469（P<0.05）。当考虑土壤性质时，其他提取方法对某些金属的植物有效性也能进行较好的预测。土壤pH值、有机质、铁锰氧化物含量和阳离子交换容量对金属的提取和植物有效性大多有影响。
