Control Effect of Several Replacement Plants on Invasive Weed Eupatorium adenophorum Spreng

To select the suitable plant species controlling Eupatorium adenophorum in hilly area, ecological adaptability, competitiveness and control efficacy of many replacement plants with economic value in Guizhou Province of China were studied. The results showed that the coverage of paspalum wetsfeteini and Dolichos lablab were 100% and 93%, which increased by 3.70 and 3.44 times compared with Lolium perenne, respectively; their relative crowding coefficient with E. adenophorum were 7.09 and 22.78, which increased by 2.43 and 7.80 times compared with L perenroe, respectively. Using excavation method, the control efficacies of replacement plants were 99.3 % and 96.9%, respectively, while the control efficacy of replacement plants using mowing method was lower than 66.4%. The overwintering rate of P. wetsfeteini in the following year was 95% ; its coverage was still 100% and its control efficacy against E. adenophorum remained over 99%. D. lablab was difficult to survive the winter in the north region beyond 26.2°N, so it could only be applied as annual replacement plant. The coverage of Setaria anceps, Cajanus cajan and other test plants were less than 90%, with poor control efficacy against E. adenophorum.

Control Effect of Replacement Cultivation of Several High Quality Forages against Eupatorium adenophorum

[Objective] The paper was to analyze the control effect of replacement cultivation of several high quality forages against Eupatorium adenophorum. [ Method] Five high quality forages including Lolium perenne, Dactylis glomerata, Setaria anceps, Trifolium repens and Medicago sativa were planted in the fields invaded by E. adenophorum, and their ecological adaptability and control effect against E. adenophorum were studied. [Result] Five kinds of forages could nor- mally grow at the local land. The indexes such as coverage, plant height, fresh weight of stems and leaves of S. anceps were the highest, and it showed very strong ecological adaptability as well as the best control effect on E. adenophorum, up to 97.85% and 93.81% at the first and second year, respectively, indicating good sustainable control effect. D. glomerata ranked the second place, of which the coverage after one year was 86% and the control effect on E. adenophorum was 89.68%. The other species showed poor control effect on E. adenophorum because of slow growth rate and heavily damage from companion weeds even they could establish dominant communities. [ Condusion] The paper provided reference for ecological control against E. adenophorum in local land and ecological restoration of invasive land.

Some new criteria for lag synchronization of chaotic Lur'e systems by replacing variables control

Some new criteria for the chaotic lag synchronization are proposed. At first,lag synchronization scheme for identical master-slave Lur‘ e systems by replacing variables control and the relevant error system are given, and the relations between absolute stability of the error system and the chaotic lag synchronization are described. Then, based on a quadratic Lyapunov function, two new Lur‘ e criteria for the above chaotic lag synchronization are proved. Four corresponding frequency domain criteria are further derived by means of Meyer-Kalman-Yacubovia Lemma. These frequency domain criteria are applied to analyze the lag synchronization of general master-slave Chua's circuits so that some ranges of the parameters in which the master-slave Chua's circuits achieve chaotic lag synchronization by replacing single-variable control are attained. Finally, some examples are given to verify the theoretical results.