东祁连山高寒草甸山生柳灌丛地上净初级生产力估测研究

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中图分类号：Q948 文献标识码：A 文章编号：1007-0435（2025）08-2596-07

doi：10.11733/j.issn.1007-0435.2025.08.020

Abstract：To construct a nondestructive estimation model for above-ground net primary productivity（ANPP） ofalpine Salix oritrepha shrubs，this study investigated S . oritrepha shrubs in an alpine meadow ecosystem of the eastern Qilian Mountains. A total of 400S . oritrepha shrubs were randomly surveyed and categorized into three size of classes based on crown area（CA）： small （⩽0.15m2） ），medium （0.15～0.6m2 ，and large（ gtrless 0.6m2× . Ten shrubs from each class （3O total） were selected to measure four shrub morphological parameters （including crown area） and five growth parameters （including new shoot number）. New shoot biomass was used as the measured ANPP value.Regression analysis was employed to establish ANPP estimation models.Results showed that：（1） The exponential model y=30 59e2.20x（R2=0.89） ）using crown area as the independent variable demonstrated good performance，providing a convenient and rapid estimation of S .oritrephaANPPinthis region;（2） The power function model y=0 62x1.51（R2=0.95） based on new shoot number exhibited optimal evaluation metrics with the highest accuracy，suitable for precise ANPP estimation. The results of this study could provide a reference for rapid and accurate quantification of alpine shrubland productivity.

Key words：Salix oritrepha; Aboveground net primary productivity;Estimation model

高寒灌丛是由耐寒、耐旱灌木组成的特殊群落，是灌丛生态系统重要的植被类型之一[1]，具有适应低温干旱、抗风沙、耐贫瘠、更新快的特点。（剩余10809字）