关键词: 生态化学计量学, 营养元素, 入侵年限, 短叶茳芏

Abstract: Landscape dynamics is one of the core areas in landscape ecology study, and also, the basis of relevant ecological and environmental researches. In this paper, the changes of the landscape pattern in Tieling City of Liaoning Province in 2002-2011 were comprehensively studied by using traditional spatial statistical analysis, transition matrix, landscape metrics, landscape dynamic index, and Kappa coefficient series method based on 3S technology. During the study period, the landscape pattern in the City changed in a certain degree. The upland area increased substantially, while the paddy field area reduced markedly. The landscapes of different categories kept changing. Overall, the shape of the landscape patches tended to be more complex. The landscape pattern became heterogeneous, and the landscape fragmentation tended to be intensified. Human activities affected the landscape pattern obviously. The comprehensive landscape dynamic index from 2002 to 2007 was significantly higher than that from 2007 to 2011, which showed a slowdown trend of landscape dynamics. The results of Kappa index series showed that the landscape pattern change was gradually transformed from the change of landscape categories into the change of position. It was suggested that a combined application of multi-methods could reflect the dynamic change of landscape pattern more comprehensively and effectively.

Key words:  nutrient element, invasion duration., Cyperus malaccensis, ecological stoichiometry