西辽河流域归一化植被指数与气象因子相关性分析

doi:10.3969/j.issn.1673-503X.2021.03.012

Abstract

Abstract:

The paper aims to understand the distribution rule and trend change of the normalized difference vegetation index(NDVI) and its response to climate change in the West Liao River Basin.Linear regression and correlation analysis were used to analyze the delay of NDVI and meteorological factors in each month of the growing season, and the correlation between NDVIs of different vegetation types and meteorological factors in the 10 km buffer zone around the meteorological station based on the daily meteorological data of 11 meteorological stations and MODIS normalized difference vegetation index data set from 2000 to 2018.The results showed that the annual temperature, the highest temperature, the lowest temperature, and the precipitation in the West Liao River Basin all saw an uptrend.The NDVI of different vegetation types was on the rise in the West Liao River Basin, and the vegetation was improved.The increased rate of cultivated land was the largest, which benefited from the improvement and promotion of agricultural activities.The spatial distribution of NDVI was characterized by low value in the middle and high value around the West Liao River Basin.NDVI in each month lagged obviously behind precipitation in the growing season with a lag period of one month, only the NDVI in August lagged behind the average and maximum temperatures in the previous month.NDVIs of different vegetation types were closely related to the average and maximum temperatures in the West Liao River Basin.There were better correlations between NDVI of cultivated land and meteorological factors.The results provide a reference for maintaining the balance of the ecosystem in the West Liao River Basin.

Key words: Climate change, NDVI, Growth season, Hysteresis

CLC Number:

Q948

Bao-xing TIAN,Dan LIU,Li-juan GONG,Fang ZHAO,Sheng-tai JI,Hui-ying ZHAO,Cheng-long YU. Correlation analysis of NDVI and meteorological factors in the West Liao River Basin[J]. Journal of Meteorology and Environment, 2021, 37(3): 88-93.

Figures/Tables 7

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Table 1

Table 2

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NDVI	与降水量相关性系数				与平均气温相关性系数
NDVI	当月	前1月	前2月	前3月	当月	前1月	前2月	前3月
5月	0.231	0.384	0.197	0.297	0.145	0.011	0.095	0.128
6月	0.444	0.598^*	0.221	0.247	0.410	0.317	0.076	0.040
7月	0.375	0.675^**	0.262	0.011	0.591^*	0.567^*	0.372	0.113
8月	0.108	0.654^**	0.422	0.084	0.356	0.538^*	0.402	0.292
9月	0.309	0.311	0.424	0.279	0.470	0.194	0.217	0.204

NDVI	与最高气温相关性系数				与最低气温相关性系数
NDVI	当月	前1月	前2月	前3月	当月	前1月	前2月	前3月
5月	0.145	0.004	0.072	0.107	0.206	0.020	0.103	0.123
6月	0.438	0.365	0.076	0.023	0.309	0.173	0.068	0.002
7月	0.656^**	0.598^*	0.378	0.106	0.347	0.310	0.389	0.151
8月	0.400	0.642^**	0.427	0.243	0.175	0.194	0.402	0.126
9月	0.488	0.271	0.293	0.225	0.297	0.042	0.025	0.001

站点	林地				草地				耕地
站点	平均气温	最高气温	最低气温	降水量	平均气温	最高气温	最低气温	降水量	平均气温	最高气温	最低气温	降水量
扎鲁特	0.535^*	0.654^**	0.146	0.603^*	0.490	0.600^*	0.127	0.597^*	0.520^*	0.604^*	0.162	0.639^**
巴林左旗	0.003	0.348	0.529^*	0.302	0.180	0.455	0.316	0.398	0.053	0.417	0.444	0.339
通榆	0.689^**	0.733^**	0.367	0.819^**	0.598^*	0.664^**	0.289	0.793^**	0.645^**	0.716^**	0.310	0.821^**
林西	0.547^*	0.574^*	0.350	0.522^*	0.535^*	0.589^*	0.298	0.588^*	0.601^*	0.580^*	0.421	0.461
开鲁	0.393	0.478	0.083	0.262	0.226	0.325	0.118	0.250	0.228	0.295	0.039	0.045
通辽	0.394	0.517^*	0.201	0.392	0.272	0.397	0.277	0.351	0.282	0.387	0.165	0.390
双辽	0.443	0.506^*	0.281	0.325	0.524^*	0.574^*	0.328	0.325	0.608^*	0.619^*	0.380	0.308
翁牛特旗	0.662^**	0.603^*	0.606^*	0.573^*	0.390	0.395	0.266	0.586^*	0.524^*	0.479	0.431	0.606^*
赤峰	0.687^**	0.645^**	0.713^**	0.012	0.658^**	0.516^*	0.705^**	0.094	0.779^**	0.790^**	0.781^**	0.224
宝国吐	0.712^**	0.689^**	0.649^**	0.582^*	0.643^**	0.631^**	0.585^*	0.562^*	0.644^**	0.625^**	0.570^*	0.587^*
建平	0.727^**	0.677^**	0.586^*	0.366	0.512^*	0.373	0.545^*	0.260	0.638^**	0.546^*	0.581^*	0.265

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Correlation analysis of NDVI and meteorological factors in the West Liao River Basin

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