[Effect of flooding time length on mycorrhizal colonization of three AM fungi in two wetland plants].

In order to provide information for elucidating effect of flooding on the formation and function of AM in wetland plants, three AM fungi (Glomus intraradices, Glomus versiforme, Glomus etunicatum) were used to investigate the effects of flooding time length on their colonization in cattail (Typha orientalis) and rice (Oryza sativa L. ). The results showed that the mycorrhizal colonization rate (MCR) presented downtrend with increasing flooding time length.

[Strategies of nutrients control in lakes based on ecoregions of lakes in China].

In order to better reduce lake eutrophication, based on five ecoregions of lakes, the relationships of total nitrogen (TN), total phosphorus (TP), and TN/TP ratio with chlorophyll-a (Chl-a) in 100 lakes were discussed, furthermore, strategies of nutrient control were proposed respectively. Results showed that among the five ecoregions, the lake eutrophication level was the lowest in Dongbei ecoregion and the highest in Huabei ecoregion, but the eutrophication level in lakes of all the five ecoregions is increasing in recent years. Algal growth in lakes of Dongbei and Huabei ecoregions was limited by phosphorus, while it was simultaneously limited by nitogen and phosphorus in lakes of other three ecoregions (Zhongdongbu, Yungui and Mengxin).

[Effect of elevated O3 on the arbuscular mycorrhizal (AM) structure and glomalin production in two genotypes of snap bean].

In an environment with simulated elevated atmospheric ozone, two genotypes of snap bean (Phaseolus vulgaris L.) that differed in O3 sensitivity (O3-sensitive: S156; O3-tolerant: R123) were selected as host plants for arbuscular mycorrhizal (AM) fungi. The objective was to investigate the effect of elevated O3 on the AM structure and glomalin production in two genotypes, and to understand the effect of elevated O3 the growth of AM fungi and formation of AM structure.

[Effect of CO2 fertilization on residual concentration of cypermethrin in rhizosphere of C3 and C4 plant].

In order to achieve sustainable economic and environmental development in China, CO2-emission reduction and phytoremediation of polluted soil must be resolved. According to the effect of biological carbon sequestration on rhizosphere microenvironment, we propose that phytoremediation of polluted soil can be enhanced by CO2 fertilization, and hope to provide information for resolving dilemma of CO2-emission reduction and phytoremediation technology. In this study, effects of CO2 fertilization on cypermethrin reduction in rhizosphere of C3-plant (bush bean) and C4-plant (maize) were investigated.