两种除草剂对紫茎泽兰光合特性的影响

紫茎泽兰是一种重要的外来入侵生物,已在我国西南地区泛滥成灾。为了探明甲嘧磺隆和氨氯吡啶酸对紫茎泽兰光合特性的影响,为紫茎泽兰高效化学防除提供参考依据,采用单因素随机区组设计,对盆栽紫茎泽兰喷施不同浓度的甲嘧磺隆可溶性粉剂和氨氯吡啶酸水剂,测定施药后1～7 d紫茎泽兰几个光合特性参数。结果表明,随浓度和时间的增加,紫茎泽兰的光合速率（Pn）、气孔导度（Gs）、蒸腾速率（Tr）、胞间CO2浓度（Ci）及叶绿素含量呈下降趋势。0.12 g.L-1甲嘧磺隆和1.75 g.L-1氨氯吡啶酸能有效地抑制紫茎泽兰的光合作用,这两种药剂用量几乎减少一半。

Impacts of Two Herbicides on Photosynthesis of Eupatorium Adenophorum Spreng

Eupatorium adenophorum Spreng,as an important vicious alien invasive specie,has spread all over south-west China including Yunnan,Guizhou,Sichuan,Xizang and so on.It has resulted in heavy economic losses to agriculture forest and husbandry,and caused severe damage of ecosystem equilibrium in the invasion areas.The control to Crofton weed is imperative,while previous studies have shown that the control efficiency of sulfometureon methyl and picloram to E.adenophorum were excellent.A pot experiment with single-factor randomized block design was conducted to identify the impact of sulfometureon-methyl and picloram on the photosynshesis of E.adenophorum.Sulfome-turon-methyl soluble powder and picloram aqueous solution agent with a serial concentrations were sprayed to E.adenophorum,respectively,Several photosynthetic indices were determined from 1 d to 7 d after treatment.The results showed that photosynthesis（Pn）,stomatal con-ductance（Gs）,transpiration rate（Tr）,intercellular CO2 concentration（Ci）,and the content of chlorophyll in the weed plants along with the increase of the concentration and the time treat.0.12 g.L-1 sulfometureon-methyl and 1.75 g.L-1 picloram could inhibit photosynthesis of E.adenophorum effectively.The two doses almost halfed than the recommended dose,hoping to provide some new reference to effective chemical control of E.adenophorum.