科研業績
1、植被遙感：利用多源數據開展了北方森林景觀格局及動態特徵，從區域尺度闡明了植被穩定與動態的辯證關係。利用地理信息系統技術對東北地區植被變遷及潛在植被進行了研究。同時對南方地區人工林生態系統的碳循環特徵進行了解析。
2、群落與種群生態：對東北地區的闊葉紅松林等進行了群落學特徵及其對不同干擾的反應，分析了森林的更新過程及其同生境因子的關係。首次對亞高山嶽樺林進行較為全面系統的調查研究，闡明了種群生長與更新機制。
3、生態恢復與群落過程：南方紅壤丘陵地區生態系統退化後恢復過程中的物種多樣性以及群落生產力特徵，闡明了生態恢復的環境貢獻。
4、乾旱地區樹木生理：通過生理特徵及顯微解剖學研究，分析了半乾旱地區樹木抗旱機理。
5、發表論文40餘篇。
代表性學術著作
Liu, Q. J., Li, X. R. and Ma, Z. Q. 2005. Monitoring forest dynamics using satellite imagery—a case study in the natural reserve of Changbai mountain in China. Forest Ecology and Management, In press. Liu, Q. J., Li, X. R. and Hu, L. L. 2004. Change detection of coniferous forest in Changbai Mountain by the combination of image analysis and community monitoring. 套用生態學報, 15:1113—1120
Liu, Q. J., Kondoh, A. and Takeuchi, N. 1998. Study on the changes of life zones in distribution in northeast China by means of climate-vegetation classification. Ecological Research 13 (3): 355--365.
Liu, Q. J. 1997. Structure and dynamics of the subalpine coniferous forest on Changbai mountain, China. Plant Ecology 132: 97—105.
Liu, Q. J., Kondoh, A., Takamura, T. and Shao, G. 2002. Mapping of boreal vegetation of a temperate mountain in China by multi-temporal Landsat TM imagery. International Journal of Remote Sensing, 23: 3385-3405.
Liu, Q. J. and Takeuchi, N. 2001. Vegetation inventory of a temperate biosphere reserve in China by image fusion of Landsat TM and SPOT HRV. Journal of Forest Research, 6 (3):139—146.
Liu, Q. J. 2001. Monitoring of Boreal Vegetation by Multisource Data. Ph. D. thesis. Chiba University, Chiba, Japan, 142 pp.
Liu, Q. J., Tateishi, R., Kondoh, A. and Takeuchi, N. 2000. Vegetation types classification of a temperate biosphere reserve in China by multisensor satellite imagery. Journal of the Japan Society of Photogrammetry and Remote Sensing, 39: 23-34.
Liu, Q. J., Kondoh, A. and Takeuchi, N. 2000. Simulation on the response of life zone to global climate change in northeast China by means of GIS. The Journal of Japanese Society of Remote Sensing 20(1): 9--18.
Liu, Q. J., Kondoh, A. and Takeuchi, N. 1999. Study on the potential vegetation of north-east China by biogeoclimatic classification. In: Otsubo, K. (eds), Proceedings of 1999 NIES Workshop on Information Bases and Modeling for Land-use and Land-cover Changes Studies in East Asia, Tsukuba, 240-248.
Liu, Q. J., Dai, L. and Chen, H. 1998. Changes of community characteristics of a broad-leaved-conifer mixed forest after selection. Journal of Forestry Research 9(3): 152--159.
Liu, Q. J., Dai, L. and Zhang, Y. 1998. Structure and changes of broad-leaved-conifer-Korean pine mixed forest in Northeast China. Journal of Forestry Research 9(3): 141--146.
Liu, Q. J., Kondoh, A. and Takeuchi, N. 1998. The forest vegetation and its differentiation under disturbance in a temperate mountain, China. Japanese Journal of Forest Research 3 (2): 111—117.
