黄河中游不同地貌条件下植被干旱时空特征及影响因素
郭宇星(1997—),男,山西汾西人,硕士研究生,研究方向为土壤水分反演。E-mail: gyx3670@sina.com |
收稿日期: 2023-05-18
修回日期: 2023-12-05
网络出版日期: 2024-10-04
版权
Spatio-temporal characteristics and driving factors of vegetation drought in the middle Yellow River under different geomorphic conditions
Received date: 2023-05-18
Revised date: 2023-12-05
Online published: 2024-10-04
Copyright
利用归一化植被指数、地表温度和降水数据构建温度植被降水干旱指数(TVPDI)分析黄河中游2000—2021年植被干旱时空特征及影响因素,论证了黄河中游退耕还林还草工程实施与区域植被干旱特征间的关系。结果表明:① 黄河中游2000—2021年多年平均TVPDI值呈不显著上升趋势,TVPDI多年均值为0.708,对应干旱等级为轻旱。 ② 黄河中游2000—2021年TVPDI有较强的空间分异性,呈现“东北、西南部地区旱情较轻,西北、东南部地区旱情较重”的空间分布格局;从各地貌分区来看,黄土高塬沟壑区旱情较轻,风沙区与河谷平原区旱情较重。 ③ 黄河中游TVPDI空间分异的主要影响因子为气温、蒸散发和降雨量,且与TVPDI存在显著线性关系。黄河中游2000—2021年植被覆盖度与蒸散发量均呈增加趋势,土壤水分呈下降趋势。
郭宇星 , 孙从建 , 陈伟 , 张齐飞 . 黄河中游不同地貌条件下植被干旱时空特征及影响因素[J]. 地理科学, 2024 , 44(9) : 1676 -1683 . DOI: 10.13249/j.cnki.sgs.20230394
Drought is a type of natural disaster that lasts for a long time and causes a lot of damage. It has a negative impact on the security of the water supplies in the region, human production and life, and economic growth. In order to analyze the spatial-temporal characteristics and underlying causes of vegetation drought in the middle Yellow River from 2000 to 2021, the temperature vegetation Precipitation Drought Index (TVPDI) was developed in this study using normalized vegetation index, surface temperature, and precipitation data. Additionally, the relationship between the implementation of the project to convert farmland in the middle Yellow River to forest and grassland and regional vegetation drought was examined. The findings revealed that: 1) The multi-year average TVPDI value in the middle reaches of the Yellow River from 2000 to 2021 showed an insignificant upward trend, and the average multi-year TVPDI value was 0.708, corresponding to a light drought grade. 2) TVPDI in the middle reaches of the Yellow River from 2000 to 2021 has a strong spatial differentiation, showing a spatial distribution pattern of “drought is lighter in the northeast and southwest regions and heavier in the northwest and southeast regions”; From the perspective of each geomorphic region, the drought in the loess plateau gully area is light, and the drought in the wind-sand area and the valley plain area is heavy. 3) The main factors affecting the spatial differentiation of TVPDI in the middle Yellow River are temperature, evapotranspiration and rainfall, and there is a significant linear relationship with TVPDI. In the middle reaches of the Yellow River from 2000 to 2021, vegetation coverage and evapotranspiration showed an increasing trend, while soil moisture showed a decreasing trend.
表1 各自变量与因变量多元线性回归分析结果Table 1 Multiple linear regression analysis results of individual variables and dependent variables |
回归系数 | 标准误差 | T检验 | 显著性 | |
注: X 1~X 7分别代表气温、土壤水分、蒸散发量、降雨量、人口密度、坡度和植被覆盖度。 | ||||
截距 | 40.967 | 23.575 | 1.738 | 0.000 |
X 1 | −0.096 | 0.055 | −1.734 | 0.000 |
X 2 | 13.496 | 19.915 | 0.338 | 0.000 |
X 3 | −64.015 | 10.749 | −1.841 | 0.000 |
X 4 | 0.107 | 0.351 | 0.306 | 0.000 |
X 5 | −0.634 | 0.674 | −0.940 | 0.363 |
X 6 | 1.162 | 5.938 | 0.916 | 0.000 |
X 7 | −0.002 | 0.006 | −0.214 | 0.000 |
R-squared | 0.709 | |||
Durbin-Watson | 1.246 | |||
Prob(F-统计) | 0.003 | |||
条件数 | 1.02e+05 |
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