基于SWH模型的青藏高原高寒草甸蒸散发及其组分变化分析

doi:10.12118/j.issn.1000-6060.2022.086

Abstract

Abstract:

Based on the SWH dual source model, the evapotranspiration of the Nagqu Station of Plateau Climate and Environment, the Nam Co Monitoring and Research Station for Multisphere Interactions, and the Southeast Tibet Observation and Research Station for the Alpine Environment was estimated. Based on the validation of the results, the characteristics of evapotranspiration changes on the Qinghai-Tibet Plateau, China and the main influencing factors of each station were analyzed. The main conclusions are as follows: the SWH model is well applicable to the three stations on the Tibetan Plateau. The annual evapotranspiration ranges from 388 mm to 732 mm, with an increase in interannual distribution, followed by a decrease. The differences in evapotranspiration components between the three stations are significant, the contribution of evaporation to evapotranspiration at the Nagqu and Nam Co stations is 53% and 56%, respectively, and the evapotranspiration at the Southeast Tibet Station is almost entirely contributed by transpiration, accounting for 95%. The leaf area index is the most important factor affecting evapotranspiration at the three stations. The vapor pressure deficit also has a significant effect on evapotranspiration at the Southeast Tibet Station. The findings of this study can provide a scientific basis for studying the temporal and spatial patterns of evapotranspiration and its components and the water cycle process over the Tibetan Plateau.

Key words: evapotranspiration, components of evapotranspiration, SWH model, Qinghai-Tibet Plateau

MEI Jing, SUN Meiping, LI Lin. Variations of evapotranspiration and its components in alpine meadow on the Tibetan Plateau based on SWH model[J].Arid Land Geography, 2022, 45(6): 1740-1751.

Figures/Tables 9

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References 38

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站点	要素	模型1	模型2	模型3	模型4	模型5	模型6
那曲站	PAR	0.085^***（0.726）	0.002（0.019）	-0.000（0.000）	-0.017^**（-0.146）	-0.011（-0.096）	-0.005（-0.042）
	T_a	-	0.106^***（0.920）	0.105^***（0.909）	0.075^***（0.655）	0.073^***（0.636）	0.005（0.044）
	VPD	-	-	0.229（0.035）	0.648^*（0.097）	0.905^**（0.136）	1.719^***（0.259）
	R_n	-	-	-	0.082^***（0.348）	0.092^***（0.390）	0.085^***（0.359）
	G	-	-	-	-	-0.272^*（-0.115）	0.068（0.029）
	LAI	-	-	-	-	-	0.190^***（0.485）
	Constant	-1.369	1.158	1.153	0.965	0.634	-0.237
	N	230	230	230	230	230	230
	R²	0.528	0.875	0.875	0.888	0.891	0.952
	ΔR²	0.528	0.347	0.000	0.013	0.002	0.061
纳木错站	T_a	0.092^***（0.835）	0.066^***（0.599）	0.035^***（0.320）	-	-	-
	R_n	-	0.054^***（0.328）	0.047^***（0.289）	-	-	-
	LAI	-	-	0.590^***（0.405）	-	-	-
	Constant	1.495	1.123	0.597	-	-	-
	N	230	230	230	-	-	-
	R²	0.697	0.748	0.818	-	-	-
	ΔR²	0.697	0.052	0.069	-	-	-
藏东南站	PAR	0.117^***（0.787）	0.074^***（0.497）	0.048^***（0.320）	0.028^**（0.190）	-	-
	T_a	-	0.066^***（0.440）	0.054^***（0.359）	-0.008（-0.056）	-	-
	VPD	-	-	4.196^***（0.326）	5.092^***（0.396）	-	-
	LAI	-	-	-	0.043^***（0.496）	-	-
	Constant	-1.177	-0.388	-0.589	-1.275	-	-
	N	138	138	138	138	-	-
	R²	0.619	0.729	0.779	0.807	-	-
	ΔR²	0.619	0.110	0.050	0.029	-	-

Variations of evapotranspiration and its components in alpine meadow on the Tibetan Plateau based on SWH model

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