In tropical areas, larger plots have proved more useful due to greater heterogeneity of the forest. 在热带地区，由于森林的异质性较大，已证实大一些的样地更有效。
At the level of species categories, the means mercury contents of macrobenthos at each sample point were higher in the creek than that under forest. 在动物类别水平上，各滩的潮沟样地动物中的汞含量均值均大于相应林内样地动物。
