Temporal effects of climate factors on vegetation growth on the Qingzang Plateau, China

doi:10.17521/cjpe.2021.0163

Abstract

Abstract:

Aims The relationships between temporal changes in vegetation growth and climate change tend to be asymmetric. Considering the temporal effects of climate factors on vegetation growth can provide important scientific basis for accurately understanding vegetation-climate relationships and predicting the dynamic responses of vegetation to global climate change. Methods Based on the MODIS normalized difference vegetation index (NDVI), climate, and vegetation type data, this study investigated the temporal effects of climate factors on vegetation growth and the dominant factors influencing vegetation growth on the Qingzang Plateau through establishing four temporal effects equations between climate and vegetation NDVI. Important findings Among the four temporal effects, models considering both time lag and accumulation effects had the highest explanation degree (47%). Compared with model without considering temporal effect, the explanation power of the time lag and accumulation effects on vegetation would increase by 4%-18%. Vegetation dynamics on more than 43% of the Qingzang Plateau was dominated by the combined effects of time lag and accumulation, followed by the area only affected by time accumulation or lag effects, and the area without time effect. The partial correlation coefficient between NDVI and precipitation (0.25 ± 0.56) was overall higher than it between NDVI and temperature (0.08 ± 0.6). The areas dominated by the precipitation were mainly distributed on the northeast and southwest of the Qingzang Plateau with an area ratio of 40.1%, whereas the areas dominated by temperature were largely distributed on the center and southeast of the Qingzang Plateau with an area ratio of 29.7%. These research results can provide basic judgments for the relationships between vegetation growth and climate on the Qingzang Plateau.

Key words: climate factor, normalized difference vegetation index (NDVI), time lag effect, time accumulation effect, Qingzang Plateau

Ning LIU, Shou-Zhang PENG, Yun-Ming CHEN. Temporal effects of climate factors on vegetation growth on the Qingzang Plateau, China[J]. Chin J Plant Ecol, 2022, 46(1): 18-26.

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Figures/Tables 8

References 40

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土地覆盖类型 Land cover type	R²_No	R²_Lag	R²_Acc	R²_Lagacc
常绿针叶林 Evergreen needleleaf forests	0.45	0.46	0.47	0.50
常绿阔叶林 Evergreen broadleaf forests	0.39	0.42	0.43	0.47
落叶阔叶林 Deciduous broadleaf forests	0.41	0.41	0.43	0.46
混交林 Mixed forests	0.45	0.45	0.45	0.49
稀疏灌丛 Sparse shrublands	0.37	0.40	0.41	0.44
木本稀树草原 Woody savannas	0.42	0.43	0.44	0.47
稀树草原 Savannas	0.42	0.41	0.43	0.47
草地 Grasslands	0.40	0.41	0.44	0.47
永久性湿地 Permanent wetlands	0.49	0.48	0.48	0.51
耕地 Croplands	0.40	0.42	0.43	0.47

土地覆盖类型 Land cover type	R²_No	R²_Lag	R²_Acc	R²_Lagacc
常绿针叶林 Evergreen needleleaf forests	0.45	0.46	0.47	0.50
常绿阔叶林 Evergreen broadleaf forests	0.39	0.42	0.43	0.47
落叶阔叶林 Deciduous broadleaf forests	0.41	0.41	0.43	0.46
混交林 Mixed forests	0.45	0.45	0.45	0.49
稀疏灌丛 Sparse shrublands	0.37	0.40	0.41	0.44
木本稀树草原 Woody savannas	0.42	0.43	0.44	0.47
稀树草原 Savannas	0.42	0.41	0.43	0.47
草地 Grasslands	0.40	0.41	0.44	0.47
永久性湿地 Permanent wetlands	0.49	0.48	0.48	0.51
耕地 Croplands	0.40	0.42	0.43	0.47

土地覆盖类型 Land cover type	样本数 No. of samples	气温 Air temperature		降水 Precipitation
土地覆盖类型 Land cover type	样本数 No. of samples	滞后月份 Lag months	累加月份 Accumulation months	滞后月份 Lag months	累加月份 Accumulation months
常绿针叶林 Evergreen needleleaf forests	48 030	1.54	4.60	1.63	4.69
常绿阔叶林 Evergreen broadleaf forests	29 667	1.51	4.72	1.70	5.66
落叶阔叶林 Deciduous broadleaf forests	4 519	1.66	4.81	1.68	4.91
混交林 Mixed forests	50 746	1.56	4.72	1.69	5.20
稀疏灌丛 Sparse shrublands	7 125	1.94	4.89	1.50	4.72
木本稀树草原 Woody savannas	60 536	1.54	4.55	1.65	4.66
热带草原 Savannas	10 940	1.60	4.48	1.68	5.13
草地 Grasslands	1 433 101	1.61	4.32	1.45	5.19
永久性湿地 Permanent wetlands	404	1.41	4.48	1.51	4.49
耕地 Croplands	5 755	1.47	3.91	1.19	4.76

土地覆盖类型 Land cover type	样本数 No. of samples	气温 Air temperature		降水 Precipitation
土地覆盖类型 Land cover type	样本数 No. of samples	滞后月份 Lag months	累加月份 Accumulation months	滞后月份 Lag months	累加月份 Accumulation months
常绿针叶林 Evergreen needleleaf forests	48 030	1.54	4.60	1.63	4.69
常绿阔叶林 Evergreen broadleaf forests	29 667	1.51	4.72	1.70	5.66
落叶阔叶林 Deciduous broadleaf forests	4 519	1.66	4.81	1.68	4.91
混交林 Mixed forests	50 746	1.56	4.72	1.69	5.20
稀疏灌丛 Sparse shrublands	7 125	1.94	4.89	1.50	4.72
木本稀树草原 Woody savannas	60 536	1.54	4.55	1.65	4.66
热带草原 Savannas	10 940	1.60	4.48	1.68	5.13
草地 Grasslands	1 433 101	1.61	4.32	1.45	5.19
永久性湿地 Permanent wetlands	404	1.41	4.48	1.51	4.49
耕地 Croplands	5 755	1.47	3.91	1.19	4.76

土地覆盖类型 Land cover type	气温 Air temperature				降水 Precipitation
土地覆盖类型 Land cover type	无时间效应 No	滞后效应 Lag	累加效应 Acc	滞后与累加的联合效应 Combined	无时间效应 No	滞后效应 Lag	累加效应 Acc	滞后与累加的联合效应 Combined
常绿针叶林 Evergreen needleleaf forests	12.55	13.25	19.88	54.32	6.86	17.42	18.42	57.30
常绿阔叶林 Evergreen broadleaf forests	8.06	17.53	21.84	52.57	7.07	14.74	16.66	61.53
落叶阔叶林 Deciduous broadleaf forests	10.87	14.25	16.33	58.55	6.40	15.71	16.33	61.56
混交林 Mixed forests	11.30	14.64	19.19	54.86	5.92	14.45	16.59	63.04
稀疏灌丛 Sparse shrublands	7.00	18.68	14.04	60.28	6.68	14.47	22.44	56.41
木本稀树草原 Woody savannas	12.51	14.04	19.89	53.56	7.06	16.62	17.20	59.12
稀树草原 Savannas	10.55	17.88	19.18	52.39	6.72	12.49	14.95	65.84
草地 Grasslands	13.55	17.43	18.22	50.81	8.07	12.57	24.65	54.71
永久性湿地 Permanent wetlands	11.88	13.86	24.75	49.50	7.67	14.11	23.51	54.70
耕地 Croplands	15.79	19.29	18.45	46.46	8.44	12.23	29.17	50.15