杨树林地处理生活污水生态效应

Ecological Effects of Domestic Wastewater Poplar Woodland Treatment

为了研究不同污水水力负荷对不同杨树品种人工林的影响,选择了‘I-72’、‘欧美107’、‘中林2001’与‘中林46’四个杨树品种,分别按照3、6、9、12、15 cm·周^(-1)5个水力负荷进行污水处理;测定试验期间各品种地上部分生长量、凋落物量与污染物积累量。结果表明:3~9 cm·周^(-1)水力负荷增加了‘I-72’、‘中林2001’、‘欧美107’的生长量、凋落物量与污染物积累量;水力负荷大于9 cm·周^(-1)时,这3个杨树品种生长量、凋落物量与污染物积累量随着水力负荷增加而降低。在这3个品种中,‘中林2001’年生长量与污染物积累量最大,‘欧美107’中等,‘I-72’最低。从杨树生长量与污染物积累量来看,‘中林2001’最适合作为污水处理的植物材料,其次是‘欧美107’、I-72杨,污水处理的适宜水力负荷为6~9 cm·周^(-1),‘中林46’不适合用于污水处理。

A wastewater treatment experiment was conducted to estimate effects of different hydraulic loading rates on different poplar varieties plantations. Five different hydraulic loading rates （3, 6, 9, 12 and 15 cm· week^-1） were applied to four poplar clones （＂72＂, ＂107＂, ＂2001＂ and ＂46＂） during poplar growing seasons, respectively. Biomass variation, litter fall and contaminant accumulation were determined during the experiment. The suitable hydraulic loadings rate （ 6-9 cm · week^-1） resulted in the increase of growth, litter fall and contaminant accumulation compared to control treatment （no irri- gation） except for ＂46＂, and high hydraulic loadings （ 〉9 cm · week^-1 ） caused stress on the four poplar varieties. The variations of biomass and contaminant accumulation during the experiment indicated that the poplar ＂2001＂ appeared to be more suitable clone as vegetation filter for domestic wastewater treatment than poplar clone ＂ 107＂ and ＂72＂, whereas ＂46＂ was unsuitable.