摘要
[Objective] The aim was to explore response characters of NDVI of different types of vegetation to climate change. [Method] Based on NDVI data acquired by SPOT/VGT and meteorological data of five meteorological stations during 19982011, the change trend of NDVI and the relevant correlation with meteorological factors were analyzed in the research area. [Result] NDVI of different types of vegetation in Zhalong wetland kept increasing, especially after 2004. Of the vegetations, NDVI was of significant positive correlation with average temperature, average minimum temperature, average maximum temperature, rainfall and average relative humidity in a ten-day period （P 0.01）. In addition, NDVI responses are of different characters to meteorological factors. The responses of NDVI of vegetations were of lag phase to meteorological factors in Zhalong wetland. Specifically, the lag phase of ten-day average temperature and ten-day average minimum temperature was 10-20 d; the lag phase of ten-day average maximum temperature was 20 -30 d; the lag phase of ten-day rainfall was 20 d; the lag phase of ten-day averager relative humidity was 0-10 d. [Conclusion] The research provides references for further exploration of vegetations’ responses to climate change and formulation of vegetation protection and utilization under background of climate change.
[目的]探讨不同植被类型NDVI对气候变化的响应特征。[方法]利用1998~2011年SPOT/VGT逐旬最大合成NDVI资料和研究区周边5个气象站点气象数据,分析研究区内不同植被类型NDVI的变化趋势及其与气象因子的相关关系。[结果]扎龙湿地各植被类型NDVI呈增加趋势,特别是2004年后NDVI值出现跳跃式的增加。各植被类型NDVI与同期旬平均气温、旬平均最低气温、旬平均最高气温、旬降水量、旬平均相对湿度均呈极显著的正相关（P〈0.01）,且不同植被类型NDVI对气象因子的响应具有不同的特征。扎龙湿地各植被类型NDVI对气象因子变化响应存在一定的滞后性,对旬平均温度、旬平均最低温度响应的滞后期为10~20d,对旬平均最高温度响应的滞后期为20~30d,对旬降水量响应的滞后期为20d,对相对湿度变化响应的滞后期为0~10d。[结论]该研究可为进一步了解扎龙湿地不同类型植被对气候变化的响应以及制定气候变化背景下该区域植被资源保护和利用策略提供参考。
基金
Supported by the Special Fund for Meteorological-Scientific Research in the Public Interest (GYHY201306036)
Heilongjiang Science Technology Department Key Program (GZ09C102)~~
