A Study of Adsorption of Modified Corn Stalk on PCP

In order to investigate ecological adaptation mechanism of bryophyte, two dominant mosses Thuidium cymbifolium and Mnium immarginatum in Baotianman Nature Reserve were measured the content of C, N, P and their ratio in bryophyte and soil , and and analyzed the relationships of plant and soil ecological stoichiometric characteristics along altitudinal gradients. Results indicate that the content of C, N and P in green tissues of T. cymbifolium and M. immarginatum in Baotianman Nature Reserve was 46.81%-49.09%, 0.21%-0.25%, and 0.02%-0.08%. Among the different altitudinal gradients, C, N and P displayed significant differences: the significantly different content of C and N were showed in T. cymbifolium, and the content of N and P differed significantly in M. immarginatum. However, only N declined obviously as increasing altitude. In soil, the C, N, N/P and C/P showed an increasing trend with increasing elevation, while the P and C/N along altitudinal gradients were not exhibited unified trends. With the increasing in the content C, N of soil, the content C and N of T. cymbifolium raised, while the content C and N of M. immarginatum declined. With the rise in P element of soil, N/P showed different trends between two bryophyte species, the N/P in T. cymbifolium significantly decreased, while N/P in M. immarginatum significantly increased. In addition, mean value of leaf N/P was 8.51, ranking 14-16. These results suggested that the growth of the bryophyte plants in Baotianman Nature Reserve were restricted by N element, and different utilization strategies in soil P element in different bryophyte plants led to differences in ecological stoichiometric characteristics Bryophyte, Soil nutrients, Stoichiometric, Baotianman Nature Reserve, Altitude gradients 12 A Study of Adsorption of Modified Corn Stalk on PCP The comprehensive utilization of corn stalks is an urgent agricultural and environmental problem to be solved in China. In this test, we use corn stalk as adsorbent for adsorption of PCP in water, and compare the impact of three modification methods (alkali treatment, pyrolysis, graft copolymerization) on corn stalk adsorption properties. Results show that the modified corn stalk's adsorption of PCP is increased from 5.4 mg/g to 13.9 mg/g, 17.8 mg/g and 22.5 mg/g, respectively; the corn stalk after graft copolymerization and modification has the greatest adsorption capacity; after modification, both the adsorption capacity and adsorption rate constant of corn stalk on PCP are increased significantly.