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

作　　者：皇彦 宋海清[2] 孙小龙[2] 李云鹏[2] 胡琦[3] Huang Yan;Song Haiqing;Sun Xiaolong;Li Yunpeng;Hu Qi(Ulanqab Meteorological Bureau,Ulanqab,Inner Mongolia 012000,China;Inner Mongolia Autonomous Region Center for Ecology and Agrometeorology,Hohhot,Inner Mongolia 010051,China;China Agricultural University,College of Resources and Environmental Sciences,Beijing 100193,China)

机构地区：[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

出　　处：《水土保持通报》2022年第2期338-346,共9页Bulletin of Soil and Water Conservation

基　　金：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)。

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]①2000—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。[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]①Average 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.②Although 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.③LAI 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.④No 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 large

关 键 词：乌兰察布市 叶面积指数 时空变化 气候因子 

分 类 号：P49[天文地球—大气科学及气象学] Q94[生物学—植物学]