Journal of Geo-information Science >
Forest Vegetation Dynamics and Responses to Climate Change in a Southern Subtropical Monsoon Region in Jangle County
Received date: 2018-12-27
Request revised date: 2019-02-22
Online published: 2019-06-15
Supported by
National Natural Science Foundation of china, No.31870620
Copyright
Vegetation dynamics and responses to climate change is a hot research topic in the fields of ecology and geography. This paper analyzed and compared the difference in the response of different forest vegetation to different time scales in a Southern subtropical monsoon region. We assessed the dynamics characteristics of forest vegetation and relevant meteorological factors, analyzed the differences in the response of different forest vegetation to climate change. We used the 2000-2017 MODIS-EVI data and meteorological site data, and conducted the maximum value composite (MVC), liner trends, and correlation analyses. We have five major findings. Firstly, in the 18 years, the forest vegetation coverage, EVI, precipitation, and humidity increased significantly, indicating that the forest vegetation has been growing better. Secondly, at the beginning and end of the growing season, there was a significant positive correlation (p<0.1) between EVI and precipitation, so was temperature. At the beginning of the growing season, EVI was more affected by precipitation; while at the end of the growing season, it was more affected by temperature. Thirdly, climate change in the January to March and over the whole year is critically important to forest growth. With increasing time scale, the correlation with EVI and SPEI also increased. The increase of humidity on long-term scales has a positive effect on forest growth. Fourthly, broadleaf-conifer mixed forests have larger correlation coefficients with EVI and meteorological factors than other forest types do. Their correlation with SPEI at different time scales is relatively larger than with meteorological factors. Broadleaf-conifer mixed forests are climate-sensitive; more attention should be paid to their production and management to prevent damages induced by climate change. Fifthly, the correlations of forest cover change with precipitation and with SPEI_24 are extremely significant, indicating that the long-term precipitation change is an important factor affecting the change of forest vegetation coverage.
ZUO Bingjie , SUN Yujun . Forest Vegetation Dynamics and Responses to Climate Change in a Southern Subtropical Monsoon Region in Jangle County[J]. Journal of Geo-information Science, 2019 , 21(6) : 958 -968 . DOI: 10.12082/dqxxkx.2019.180686
Fig. 1 Distribution of forest vegetation types in Jiangle County图1 将乐县森林植被类型分布 |
Tab. 1 SPEI drought levels表1 SPEI干旱等级 |
干旱指数数值 | 等级 | 干旱指数数值 | 等级 |
---|---|---|---|
≥ 2 | 特涝 | (-1,-0.5] | 轻旱 |
(1.5,2] | 重涝 | (-1.5,-1] | 中旱 |
(1.0,1.5] | 中涝 | (-2,-1.5] | 重旱 |
(0.5,1] | 轻涝 | ≤-2 | 特旱 |
(-0.5,0.5] | 正常 |
Fig. 2 Trends of the monthly EVI and climate factors in Jiangle County from 2000 to 2017图2 2000-2017年将乐县月度EVI及气候因子变化趋势 |
Fig. 3 Interannual variations of EVI, temperature, precipitation, and SPEI_1 during the growing season in Jiangle County from 2000 to 2017图3 2000-2017年将乐县森林植被生长季EVI、温度、降水、SPEI_1的年际变化 |
Fig. 4 Average and change trend of forest coverage in Jiangle County from 2000 to 2017图4 2000-2017将乐县森林覆盖度多年平均值及其变化趋势 |
Tab. 2 Partial correlation coefficients between EVI and precipitation/temperature during the growing season, per forest vegetation in Jiangle county from 2000 to 2017表2 2000-2017年将乐县生长季不同森林植被EVI与降水和温度偏相关系数 |
月份 | 类别 | 阔叶林 | 针阔混交林 | 针叶林 | 竹林 |
---|---|---|---|---|---|
3 | 温度 | 0.242 | 0.302* | 0.3* | 0.277* |
降水 | 0.452** | 0.438** | 0.438** | 0.494** | |
4 | 温度 | 0.165 | 0.160 | 0.15 | 0.173 |
降水 | -0.235 | -0.254 | -0.247 | -0.232 | |
5 | 温度 | -0.354* | -0.38* | -0.325* | -0.354* |
降水 | -0.307* | -0.37* | -0.325* | -0.335* | |
6 | 温度 | 0.419** | 0.366* | 0.384* | 0.393* |
降水 | -0.185 | -0.093 | -0.112 | -0.162 | |
7 | 温度 | -0.037 | -0.031 | 0.006 | -0.035 |
降水 | 0.053 | 0.145 | 0.169 | 0.032 | |
8 | 温度 | 0.043 | -0.102 | -0.019 | 0.039 |
降水 | -0.084 | -0.103 | -0.033 | -0.1 | |
9 | 温度 | 0.362* | 0.361* | 0.347* | 0.374* |
降水 | 0.286* | 0.307* | 0.343* | 0.294* |
注:*表示0.1水平显著相关;**表示0.05水平显著相关。 |
Tab. 3 Time scales of the maximum response of EVI to SPEI during the growing season, per forest vegetation in Jiangle county from 2000 to 2017表3 2000-2017年将乐县生长季不同森林植被EVI对SPEI最大响应的时间尺度 |
月份 | 阔叶林 | 针叶林 | 针阔混交林 | 竹林 |
---|---|---|---|---|
3 | 1(0.390*) | 1(0.354*) | 1(0.328*) | 1(0.421**) |
4 | 3(-0.376*) | 3(-0.377*) | 3(-0.404*) | 3(0.389*) |
5 | 21(0.410**) | 21(0.447**) | 21(0.391*) | 21(0.403*) |
6 | 1(-0.283) | 1(-0.196) | 1(-0.183) | 1(-0.260) |
7 | 24(0.575***) | 24(0.606***) | 24(0.608***) | 24(0.534***) |
8 | 21(0.377*) | 12(0.361*) | 12(0.342*) | 15(0.395*) |
9 | 4(-0.207) | 4(-0.147) | 3(0.129) | 4(-0.193) |
注:括号内为相关系数,*表示0.1水平显著相关;**表示0.05水平显著相关;***表示0.01水平显著相关。 |
Fig. 5 Correlation between EVI and multi-time scale SPEI during the growing season, per forest vegetation type in Jiangle county from 2000 to 2017图5 2000-2017年将乐县生长季不同森林植被各月份EVI与多时间尺度SPEI相关分析 |
Tab. 4 Correlation coefficients between vegetation coverage and the climatic factors in Jiangle county from 2000 to 2017表4 2000-2017年将乐县覆盖度与气候因子相关系数 |
温度 | 降水 | SPEI_12 | SPEI_15 | SPEI_18 | SPEI_21 | SPEI_24 | |
---|---|---|---|---|---|---|---|
R | 0.33* | 0.262 | 0.2 | 0.259 | 0.311* | 0.403* | 0.408* |
注:R为相关系数,*表示0.1水平显著相关,温度和降水与覆盖度采用偏相关分析,其余为Pearson相关分析。 |
The authors have declared that no competing interests exist.
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