基于扰动指数的岷江上游森林扰动时间序列研究——以理县为例

Study on Spatio-temporal Variation of Forest Disturbance in Lixian by Disturbance Index

摘要: 利用扰动指数算法对四川省阿坝州理县的森林扰动进行时间序列监测研究。基于TM数据对1994－2001，2001－2007，2007－2008，2008－2011年4个时间段的理县森林扰动进行监测。结果表明，4个时间段理县受扰动的森林面积分别为437.94，278.46，260.46，184.14 hm2，主要原因依次为人为活动，洪水及次生灾害影响，汶川地震破坏，滑坡、塌方和堰塞湖等地震次生灾害。经过验证kappa系数达到0.84。数据显示，2001年前该县森林扰动较为严重，2001年后该县受扰动森林面积逐步减少，说明森林状况逐渐转好。

Abstract: Research was made on forest disturbance in time series in Lixian county, Sichuan province by disturbance index. Based on TM remote sensing data, determinations were conducted on forest disturbance during four periods, like 1994-2001, 2001-2007, 2007- 2008 and 2008-2011. The result showed that during the 4 periods, forest disturbance area in Lixian was 437.94ha, 278.46ha, 260.46ha and184.14ha. The main causes were human activities, flood and secondary disasters, Wenchuan Earthquake and its secondary disasters of the earthquake such as landslide and dammed lake. Kappa coefficient was 0.84. Analysis demonstrated that forest disturbance was serious before 2001, but decreased then, indicating healthier forest.