AgResearch, Ruakura Research Centre, Private Bag 3123, Hamilton, 3240, New Zealand.
School of Agriculture and Environment, Massey University, Private Bag 11-222, Palmerston North, 4442, New Zealand.
Environ Pollut. 2022 Aug 15;307:119466. doi: 10.1016/j.envpol.2022.119466. Epub 2022 May 13.
Leaching of herbicides in cropping soils not only impacts the groundwater sources but also reduces their effect in controlling weeds. Leaching studies were carried out in two cropping soils and two forestry biowaste media, wood pulp and sawdust with two herbicides, atrazine and bromacil in a packed lysimeter with simulated rainfall. The hypothesis was that high organic matter forestry biowaste soil amendments reduce the leaching of herbicides through the soil profile. Results from the experimental setups varied due to the impact of the simulated rainfall on the surface structure of the media. Organic carbon content, pH and structure of the media were all factors which affected the leaching of the two herbicides. The hypothesis was true for wood pulp, but for sawdust, organic matter content had less bearing on the leaching of the herbicides than other over-riding factors, such as pH, that were media specific. In sawdust, its large particle size and related pore volume allowed preferential flow of herbicides. Overall, the data indicated that both forestry biowastes were retentive to herbicide leaching, but the effect was more pronounced with wood pulp than sawdust.
在耕作土壤中淋洗除草剂不仅会影响地下水水源，还会降低其控制杂草的效果。本研究在两个耕作土壤和两个林业生物废物介质（木浆和木屑）中进行了淋洗研究，采用有模拟降雨的填充渗滤器，用两种除草剂莠去津和溴麦隆进行了淋洗研究。假设是高有机质林业生物废物土壤改良剂通过土壤剖面减少除草剂的淋洗。由于模拟降雨对介质表面结构的影响，实验装置的结果有所不同。有机碳含量、pH 值和介质结构都是影响两种除草剂淋洗的因素。该假设适用于木浆，但对于木屑，有机质含量对除草剂淋洗的影响小于其他主导因素，如 pH 值，这是介质特有的。在木屑中，其较大的粒径和相关的孔隙体积允许除草剂优先流动。总体而言，数据表明两种林业生物废物都对除草剂淋洗具有保留性，但木浆的效果比木屑更为明显。
