The efficiency of a wheat-poplar agroforestry system was investigated in order to assess nutrient and pesticide uptake in an experimental plot located in Athens, Greece, during the spring–summer cultivating period of 2017. Soil sampling was performed on a monthly basis and the monitored pollutants were NO 3 − –N, NO 2 − –N, NH 4 + –N and PO 4 3− –P ions, and the herbicides pendimethalin along with its metabolite M455H001, iodosulfuron-methyl-sodium and mesosulfuron-methyl-sodium. Soil analysis was performed using Liquid Chromatography tandem mass spectrometry and Ion Chromatography. The tested tree-crop system exhibited reductions of more than 80% and up to 100% for nutrients, whilst with regards to the examined herbicides and M455H001 metabolite, their lessening was more than 75% and up to 100% in the closest to the tree row points compared to the control point away from the trees. In conclusion, agroforestry alley cropping systems exhibit a potential for tree uptake of excess pesticides and nutrients and may act as a technique for pollution abatement, since tree roots that extend below the crops can uptake the excess of agrochemicals that would otherwise remain in soil or enter ground and surface waters.

中文翻译：

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麦杨联合栽培土壤除草剂和养分浓度变化动态：生长季田间试验模型

为了评估 2017 年春夏季栽培期间位于希腊雅典的试验田的养分和农药吸收情况，研究了小麦-杨树混农林业系统的效率。每月进行一次土壤采样，并监测到污染物为 NO 3 - -N、NO 2 - -N、NH 4 + -N 和 PO 4 3- -P 离子，以及除草剂二甲戊灵及其代谢物 M455H001、甲基磺隆和甲基磺隆。使用液相色谱串联质谱和离子色谱进行土壤分析。经测试的树木作物系统的养分减少了 80% 以上，最高可达 100%，而关于所检测的除草剂和 M455H001 代谢物，与远离树木的控制点相比，它们在最靠近树行的点处减少了 75% 以上，最高可达 100%。总之，农林小巷种植系统显示出树木吸收过量杀虫剂和养分的潜力，并可以作为一种减少污染的技术，因为延伸到作物下方的树根可以吸收多余的农药，否则这些农药会留在土壤中或进入地下水和地表水。