生态环境学报Issue(3)：477-484,8.
桑树（Morusalba）与丛枝菌根的共生对重金属元素吸收的影响
Effects of symbiosis of mulberry (Morus alba) with arbuscular mycorrhizae on absorption of heavy metals (Fe, Mn, Zn, Cu and Cd)
摘要
Abstract
Mulberry is colonized by Arbuscular mycorrhizal (AM) fungi. The AM symbiosis is important for heavy metal absorption by host mulberry. However, the symbiont of mulberry with AM fungi should change with various soil conditions. Mulberry is usually established for sericulture in Libo and Huangping areas of southwest China. Therefore, the leaf quality is important for sericulture. Libo and Huangping are located in limestone areas, among where sandstone distributed, resulting in different soil pH in collected samples in both Libo and Huangping. Our results showed that average soil pH of Libo soils (4.92±1.03) was significantly lower than that of Huangping soils (5.96±1.08). Soil acidity directly affects the distribution of AM fungi. Relatively lower soil pH of Libo soils should be favorable to the growth of fungi, therefore, to the formation of symbionts, resulting in higher bioavailability of heavy metals in soils, and higher absorption of heavy metals by mulberry. In addition, sugar concentration of mulberry foliage from Libo (67±27) mg·g-1 was significantly lower than that from Huangping (105±57) mg·g-1, but sugar concentration of mulberry roots from Libo (125±43) mg·g-1was significantly higher than that from Huangping (91±43) mg·g-1 Those results indicate that compared with Huangping (with higher soil pH), more products of photosynthesis enter to roots from Libo (with lower soil pH). Fungi are obligated symbionts and cannot survive without photosynthate supply from plants. Another role of root exudates is the solubility of heavy metals, resulting in higher ability of movements, and easily absorption by host plants. Therefore, it is why mulberry foliagein from Libo with lower soil pH having higher concentrations of heavy metal. Although mulberry can adapt to Kast areas with drought and poor nutrients of environments, their favorable soil is relatively acidified with rich nutrients.关键词
桑树/重金属/丛枝菌根/土壤pH/有机分泌物Key words
mulberry/heavy metal/arbuscular mycorrhizael/soil pH/organic exudate分类
资源环境引用本文复制引用
樊宇红,凌宏文,朴河春..桑树（Morusalba）与丛枝菌根的共生对重金属元素吸收的影响[J].生态环境学报,2014,(3):477-484,8.基金项目
国家自然科学基金项目 （）
