MixSIAR和IsoSource模型对比分析天山北坡不同灌木的夏季水分来源
收稿日期: 2022-06-01
修回日期: 2022-07-08
网络出版日期: 2023-03-31
基金资助
新疆维吾尔自治区自然科学基金资助项目面上项目(2021D01C056);新疆维吾尔自治区教育厅人才类项目-天池博士计划(tcbs201918);新疆大学博士启动基金(BS190206);自治区林业发展补助资金项目(XJLYKJ-2022-10);自治区林业发展补助资金项目(XJLYKJ-2021-20)
Comparative analysis of summer water sources of different shrubs on the northern slope of Tianshan Mountains by MixSIAR and IsoSource models
Received date: 2022-06-01
Revised date: 2022-07-08
Online published: 2023-03-31
本研究旨在为量化植物水分来源选取模型时提供一定参考。结合氢氧稳定同位素技术量化植物水分来源的常用方法主要有MixSIAR模型和IsoSource模型,不同模型的量化结果各不相同,存在差异,择优选取模型对减少结果的不确定性具有重要意义。本文以天山北坡山前灌木带两种优势树种黑果栒子(Cotoneaster melanocarpus)和异果小檗(Berberis heteropoda)为研究对象,分别于2019年和2021年7—9月测定了植物木质部水和潜在环境水源的稳定氢氧同位素组成,运用MixSIAR和IsoSource模型分别量化植物水分来源,对比分析两种模型的计算结果,根据均方根误差(Root Mean Square Error,RMSE)和参数R对模型量化结果进行评价。结果表明:(1) 两种模型对植物主要潜在水源的量化结果存在差异,造成差异的原因与两种模型的计算原理不同有关。(2) 两模型量化得到植物主要潜在水源一致的前提下,IsoSource模型量化的结果数值大于MixSIAR模型。(3) 通过RMSE与参数R的结果均表明本研究中IsoSource模型对植物水源量化结果的准确性高于MixSIAR模型,可能与异果小檗和黑果栒子水源差异较大有关,MixSIAR模型可能在量化植物水源相似度较高的情况精确度更高。
关键词: 氢氧稳定同位素; 水分来源; MixSIAR模型; IsoSource模型; 天山北坡
李红梅 , 巴贺贾依娜尔·铁木尔别克 , 常顺利 , 古丽哈娜提·波拉提别克 , 张毓涛 , 李吉枚 . MixSIAR和IsoSource模型对比分析天山北坡不同灌木的夏季水分来源[J]. 干旱区研究, 2023 , 40(3) : 445 -455 . DOI: 10.13866/j.azr.2023.03.11
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.
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