汽车尾气对路旁琵琶柴的影响

Effect of Vehicle Exhaust Gas on Reaumuria soongorica by the Road.

琵琶柴(Reaumuria soongorica)广布于我国新疆、内蒙、宁夏、甘肃、青海等干旱、半干旱地区,为泌盐的超旱生小灌木。在平缓干燥的砾质、砂砾质荒漠区,常成为优势种。作为牧草,它品质中等,耐牧性很强,不仅是草原化荒漠相典型荒漠地区骆驼和羊等家畜的主要度荒饲草,而且还是新疆卡拉麦里山有蹄类野生动物保护区内食性单调的国家一级保护动物蒙古野驴(Equus hemionus)和国家二级保护动物鹅喉羚(Gezella subgutturosa)所啃食的种类。

The range of influence of vehicle exhaust Pb on Reaumuria soongorica by the road is 30 meters. The background value of Pb in the leaves of R. soongorica in the Kalamili Mountain Reserve is 0.61—0.77mg·kg^(-1), its average is 0.6869mg·kg^(-1). The relationship between Pb content in leaves and distance to the road is described as: Cx=0.6869+0.3761exp (-0.034x), r=0.87. In average, Pb content in leaves of R. soongorica reduces 3.4% per meter from the road.