首先应采集同种条件叶片时尽量保证采集对象的生长地点间隔至少10m以上。

First of all, when collecting leaves under the same conditions, try to ensure that the growth locations of the objects are at least 10m apart. Secondly, we must pay attention to the control variables, and basically ensure that the collection site has the same environmental conditions except for the pM2.5 concentration.

First of all, we should collect the same kind of conditional blades as far as possible to ensure that the collection object's growth site interval of at least 10m or more. Secondly, we should also pay attention to the control variables, the basic guarantee collection site in addition to pM2.5 concentration, other environmental conditions unified.

First, the same conditions of blade should be collected to ensure that the growth site of the acquisition object is at least 10m apart. Secondly, the control variables should be paid attention to, which basically ensures that the collection site is unified in other environmental conditions except for the concentration of PM2.5.<br>