The Vegetation Dynamic Research Under of Eco-geographical Region Framework on Greater Khingan Mountains
Received date: 2012-04-13
Request revised date: 2012-10-22
Online published: 2013-02-20
Copyright
In recent years, ecological deterioration trend of the mountain regions caused by global climate change and unreasonable resource development increased gradually. In this article, the spatial distribution and dynamic change of vegetation cover in the Greater Khingan Mountains are analyzed based on 8-km resolution GIMMS NDVI data from 1982 to 2006. Combining the meteorological data, the relationship between NDVI and climatic factors of vegetation variation response to climate change was discussed. The average NDVI values of the north and center were higher (0.65 and 0.63) than those of the northwest and south (0.57 and 0.51). The results showed that the NDVI values in Greater Khingan Mountains was increased more than decreasing in 1982-2006. The NDVI increased and decreased area covered about 80% and 20% of the whole study area respectively. Spatial changing trend of NDVI had great difference and most parts in different eco-geographical indistinct change. The decreased area was distributed in north, and center of the mountains. The region with marked increasing trend was mainly distributed on the south of the Greater Khingan Mountains. There was significant positive correlation between NDVI and climatic factors (temperature and precipitation), and NDVI had a stronger correlation with temperature than that with precipitation for the four eco-geographical region. By other factors, the weakest correlation was shown in the steppes vegetation cover region. The NDVI in Greater Khingan Mountains showed positive spatial autocorrelation in the whole region and similar NDVI were apt to aggregate together. A downward trend is detected in the high-high autocorrelation type, which tends to spread toward the lower reach of the north and center. The opposite result is obtained for the low-low autocorrelation type in the northwest.
Key words: Greater Khingan Mountains; NDVI; eco-geographical region
GUO Xiao-yi , ZHANG Hong-yan . The Vegetation Dynamic Research Under of Eco-geographical Region Framework on Greater Khingan Mountains[J]. SCIENTIA GEOGRAPHICA SINICA, 2013 , 33(2) : 181 -188 . DOI: 10.13249/j.cnki.sgs.2013.02.181
Table 1 Each eco-geographical region natural conditions on Greater Khingan Mountains表1 大兴安岭各部分生态地理特征 |
Ⅰ | Ⅱ | Ⅲ | Ⅳ | |
---|---|---|---|---|
温度状况 | 寒温带 | 中温带 | 中温带 | 中温带 |
干湿状况 | 湿润 | 半湿润 | 半湿润 | 半干旱 |
主要植被类型 | 针叶林 | 森林草原 | 草原森林 | 草原 |
Fig.1 Location of the study area图1 研究区示意图 |
Fig.2 The monthly accumulated temperature (a) and mean NDVI (b) varies by latitude图2 大兴安岭月积温(℃)(a)与月NDVI均值(b)随纬度的变化 |
Fig.3 Spatial distribution of average NDVI of growth season of Greater Khingan Mountains in 1982-2006图3 1982~2006年生长季平均NDVI空间分布 |
Fig.4 The variation rate of average NDVI of growth season of Greater Khingan Mountains in 1982-2006图4 1982~2006年生长季平均NDVI变化趋势 |
Table 2 Variation of NDVI in different eco-geographical region on Greater Khingan Mountains表2 大兴安岭各生态地理区NDVI变化趋势 |
Ⅰ(%) | Ⅱ(%) | Ⅲ(%) | Ⅳ(%) | |
---|---|---|---|---|
≤-0.002 | 0 | 0.32 | 0.17 | 0.08 |
-0.002~-0.001 | 2.45 | 1.13 | 3.36 | 1.86 |
-0.001~0 | 24.34 | 14.01 | 18.04 | 12.25 |
0~0.001 | 53.59 | 35.59 | 42.11 | 30.89 |
0.001~0.002 | 18.33 | 35.10 | 32.13 | 37.28 |
0.002~0.003 | 1.28 | 12.72 | 4.03 | 15.98 |
0.003≤ | 0 | 1.13 | 0.17 | 1.66 |
Fig.5 NDVI changing trend of growth season in typical region meteorology stations图5 典型气象站点生长季平均NDVI变化 |
Table 3 Correlation analysis between climatic variables and NDVI at the vegetation growth season in Greater Khingan Mountains表3 大兴安岭NDIV与气温和降水的相关系数 |
生态地理区 | 台站名称 | 相关系数 | 偏相关系数 | ||
---|---|---|---|---|---|
气温 | 降水 | 气温 | 降水 | ||
Ⅰ | 漠河 | 0.877 | 0.522 | 0.828 | -0.094 |
新林 | 0.895 | 0.610 | 0.827 | 0.021 | |
图里河 | 0.884 | 0.632 | 0.798 | 0.013 | |
Ⅱ | 额尔古纳右旗 | 0.901 | 0.552 | 0.862 | -0.211 |
阿尔山 | 0.874 | 0.611 | 0.790 | -0.014 | |
Ⅲ | 大兴安岭 | 0.881 | 0.621 | 0.798 | -0.031 |
小二沟 | 0.822 | 0.542 | 0.738 | -0.087 | |
博克图 | 0.894 | 0.599 | 0.829 | -0.049 | |
索伦 | 0.841 | 0.537 | 0.768 | -0.005 | |
Ⅳ | 巴林左旗 | 0.573 | 0.362 | 0.477 | 0.015 |
林西 | 0.656 | 0.458 | 0.540 | 0.131 | |
赤峰 | 0.457 | 0.281 | 0.377 | 0.032 | |
丰宁 | 0.633 | 0.468 | 0.499 | 0.145 | |
围场 | 0.663 | 0.501 | 0.531 | 0.198 |
Fig.6 Local spatial autocorrelation pattern and change of NDVI in Greater Khingan Mountains图6 大兴安岭NDVI局部空间自相关格局及动态变化 |
The authors have declared that no competing interests exist.
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