乌兰察布市植被叶面积指数时空变化及对气候因子的响应

皇彦; 宋海清; 孙小龙; 李云鹏; 胡琦

doi:10.13961/j.cnki.stbctb.2022.02.045

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乌兰察布市植被叶面积指数时空变化及对气候因子的响应

试验研究

- 乌兰察布市植被叶面积指数时空变化及对气候因子的响应
- Spatiotemporal Variation of Leaf Area Index and Its Response to Climatic Factors in Ulanqab City
- 水土保持通报 2022年42卷第2期页码：338-346
- 作者机构：
  
  1. 乌兰察布市气象局,内蒙古,乌兰察布,012000
  2. 内蒙古自治区生态与农业气象中心,内蒙古,呼和浩特,010051
  3. 中国农业大学资源与环境学院,北京,100193
- 作者简介：
- 基金信息：
  
  国家重点研发计划重大自然灾害监测预警与防范专项“实况融合产品在智能网格预报中的应用”(2018YFC1506606)
- DOI：10.13961/j.cnki.stbctb.2022.02.045
  中图分类号： Q94;P49
- 纸质出版：2022
- 稿件说明：
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皇彦, 宋海清, 孙小龙, 等. 乌兰察布市植被叶面积指数时空变化及对气候因子的响应[J]. 水土保持通报, 2022,42(2):338-346.

Huang Yan, Song Haiqing, Sun Xiaolong, et al. Spatiotemporal Variation of Leaf Area Index and Its Response to Climatic Factors in Ulanqab City[J]. Bulletin of Soiland Water Conservation, 2022, 42(2): 338-346.
皇彦, 宋海清, 孙小龙, 等. 乌兰察布市植被叶面积指数时空变化及对气候因子的响应[J]. 水土保持通报, 2022,42(2):338-346. DOI： 10.13961/j.cnki.stbctb.2022.02.045.

Huang Yan, Song Haiqing, Sun Xiaolong, et al. Spatiotemporal Variation of Leaf Area Index and Its Response to Climatic Factors in Ulanqab City[J]. Bulletin of Soiland Water Conservation, 2022, 42(2): 338-346. DOI： 10.13961/j.cnki.stbctb.2022.02.045.

摘要

[目的] 研究乌兰察布市植被叶面积指数(LAI)动态变化及对气候因子的响应，为该地区资源合理分配和生态保护提供科学依据。[方法] 基于2000—2019年7—8月哥白尼气候变化服务项目PROBA-V LAI数据，结合气象数据，利用趋势分析、变异系数法、相关性分析方法等探讨了乌兰察布市LAI时空变化及与气温、降水、土壤湿度的关系。[结果] ① 2000—2019年7—8月乌兰察布市LAI整体呈波动上升趋势，速度为0.01/a，LAI空间分布差异明显，呈东南高西北低的特征。②LAI增加的区域占88.3%，兴和县大部、丰镇市东部、凉城县西部、四子王旗西南部及察哈尔右翼中旗中北部等地显著增加，阴山以北的后山大部分地区LAI上升速度较缓慢或出现下降，研究期内植被LAI变化相对不稳定。③LAI与同期气温呈显著负相关，与降水和土壤湿度呈极显著正相关，且与土壤湿度的相关性高于降水和气温。④LAI与气温、降水、土壤湿度的相关系数空间分布差异不显著，大部分区域植被LAI与气温呈负相关，45.4%的区域相关性显著；与降水和土壤湿度呈显著正相关，呈极显著正相关的区域土壤湿度大于降水。[结论] 2000—2019年，乌兰察布市植被LAI整体上升，空间异质性明显，土壤湿度是影响植被生长的决定性因素。

Abstract

[Objective] The dynamic change of leaf area index (LAI) and its response to climatic factors in Ulanqab City were studied in order to provide a scientific basis for rational resource allocation and ecological conservation. [Methods] Based on the Copernicus Climate Change Service PROBA-V LAI data and meteorological data from July to August during the period of 2000—2019

the spatiotemporal variation of LAI and its relationship with temperature

precipitation

and soil moisture in Ulanqab City were explored using linear trend analysis

coefficient of variation analysis and correlation analysis. [Results] ① Average LAI showed a fluctuating upward trend at a growth rate of 0.01 per year in Ulanqab City during the study period. Significant differences were found in the spatial distribution of LAI

which was characterized by high LAI in the southeast and low LAI in the northwest. ② Although 88.3% of the study area showed an increasing trend for LAI

the change of LAI was relatively unstable during the study period. A significant increasing trend was found in most of Xinghe County

the east of Fengzhen City

the west of Liangcheng County

the southwest of Siziwang Banner

and the central and northern parts of Chahar Right Middle Banner

while a slowly increasing or decreasing trend was found in most areas of Houshan Mountain in the north of Yinshan Mountain. ③ LAI showed a significant negative correlation with temperature

and a highly significant positive correlation with precipitation and soil moisture. The correlation of LAI with soil moisture was higher than that of precipitation and temperature. ④ No significant difference was found in the spatial distribution of correlation coefficients between LAI and temperature

precipitation

and soil moisture. Most areas had negative correlations between LAI and temperature

with 45.4% of the study area showing significant negative correlations. LAI had significant positive correlations with precipitation and soil moisture

and the area of significant correlation between LAI and soil moisture was larger than that of precipitation. [Conclusion] During 2000—2019

the LAI of vegetation in Ulanqab City showed an increasing trend and obvious spatial heterogeneity. Soil moisture was the decisive factor affecting vegetation growth.

关键词

Keywords

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