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Global quantitative synthesis of effects of biotic and abiotic factors on stemflow production in woody ecosystems

Citation

Zhang, Yafeng et al. (2021), Global quantitative synthesis of effects of biotic and abiotic factors on stemflow production in woody ecosystems, Dryad, Dataset, https://doi.org/10.5061/dryad.j3tx95xcs

Abstract

Aim: Stemflow has been increasingly recognized as an indispensable component in water and nutrient budgets within vegetated ecosystems. Here we aim to quantify the stemflow percentage (St, %) of incident precipitation (i.e., stemflow production) at a global scale, and to provide a systematic evaluation on how biotic and abiotic factors affect St.

Location: Global

Time period: 1970 – 2019

Major taxa studied: Woody plants (trees and shrubs)

Methods: We compiled a global stemflow dataset from 234 peer-reviewed papers, which included 488 observations of St and the related biotic (stand characteristics) and abiotic factors (climate variables) at 283 sites within terrestrial woody plant ecosystems. We explored the global pattern of St and performed a machine learning method (boosted regression trees) to model the effects of biotic and abiotic variables on St.

Results: Globally, the median (interquartile range, IQR) St was 2.7 % (1.0 – 6.3 %). We found that St in arid zones (type B in Köppen-Geiger climate classification) was significant higher (P < 0.01) than in other climate types, and we also detected a significant difference (P < 0.01) in St between trees (median: 2.4 %; IQR: 1.0 – 5.3 %) and shrubs (median: 7.2 %; IQR: 5.2 – 11.9 %). Predictor variables that substantially accounted for the explained deviance of the final model included vegetation height (27.0 %), mean annual precipitation (16.1 %), mean annual temperature (14.4 %), stand density (10.8 %), stand age (8.9 %), and bark type (5.5 %). In contrast, leaf area index, diameter at breast height, basal area, phenology type, life form, and leaf type were classified as low importance.

Main conclusions: Our synthesis provides a cross-site comparison of St, and gives a holistic view on how climate variables and stand characteristics contribute to and affect global stemflow production.

Funding

National Key Research and Development Program of China, Award: 2016YFE0203400

Youth Innovation Promotion Association of the Chinese Academy of Sciences, Award: 2019415

National Natural Science Foundation of China, Award: 4,153,075,041,771,100

Fundamental Research Funds for the Central Universities, Award: lzujbky‐2020‐kb42