MixSIAR和IsoSource模型对比分析天山北坡不同灌木的夏季水分来源

doi:10.13866/j.azr.2023.03.11

Abstract

Abstract:

This study aims to provide reference for quantifying the selection model of plant water sources. MixSIAR model and IsoSource model are commonly used to quantify plant water sources by combining hydrogen and oxygen stable isotope technology. However, different models yield varying quantitative results. Hence, choosing the best model is important to reduce the uncertainty of results. In this work, the hydrogen and oxygen stable isotope compositions of stem xylem water and each potential water source of two shrubs were measured from July to September in 2019 and 2021. The dominant tree species Cotoneaster melanocarpus and Berberis heteropoda in the premontane shrub zone of the northern slope of Tianshan Mountain were selected as subjects. MixSIAR and IsoSource models were used to quantify plant water sources, and their results were compared and evaluated according to the root mean square error (RMSE) and parameter R. Results showed (1) differences in the quantification results of the two models for the main potential water sources of plants. These differences were related to the calculation principles of the two models. (2) Under the premise that the two models quantify the same main potential water sources of plants, the IsoSource model quantifies larger values than the MixSIAR model. (3) The results of RMSE and parameter R showed that the error of IsoSource model in quantifying plant water sources was smaller than that of MixSIAR model possibly due to the large difference between C. melanocarpus and B. heteropoda In summary, the MixSIAR model may be more accurate in quantifying the similarity of plant water sources than the IsoSource model.

Key words: hydrogen and oxygen stable isotopes, water sources, MixSIAR model, IsoSource model, the northern slope of Tianshan Mountains

LI Hongmei, Bahejiayinaer TIEMUERBIEKE, CHANG Shunli, Gulihanati BOLATIBIEKE, ZHANG Yutao, LI Jimei. Comparative analysis of summer water sources of different shrubs on the northern slope of Tianshan Mountains by MixSIAR and IsoSource models[J].Arid Zone Research, 2023, 40(3): 445-455.

Figures/Tables 9

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References 34

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	土壤含水量							土壤水δ¹⁸O
	2019年7—9月			2021年7—9月				2019年7—9月			2021年7—9月
	df	F	P	df	F	P	df		F	P	df	F	P
土壤深度	4	20.48	<0.001	4	12.30	<0.001		4	11.52	<0.001	4	31.93	<0.001
月份	2	18.44	<0.001	2	15.47	<0.001		2	1.01	0.37	2	0.42	0.66
土壤深度×月份	8	3.06	<0.05	8	4.78	<0.001		8	0.31	0.96	8	1.30	0.27

	2019年				2021年
	MixSIAR模型		IsoSource模型		MixSIAR模型		IsoSource模型
	RMSE	R	RMSE	R	RMSE	R	RMSE	R
7月	0.6325	0.0124	0.0051	0.0028	0.9721	0.0239	0.3066	0.0033
8月	1.5287	0.0602	0.0106	0.0317	1.2175	0.0554	0.0051	0.0158
9月	1.5851	0.0602	0.0007	0.0032	1.5553	0.0726	0.6115	0.0087

Comparative analysis of summer water sources of different shrubs on the northern slope of Tianshan Mountains by MixSIAR and IsoSource models

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