Integrative Biology Journals

Plant Diversity ›› 2026, Vol. 48 ›› Issue (04): 766-781.DOI: 10.1016/j.pld.2026.04.011

• Articles • Previous Articles     Next Articles

How does plant diversity drive productivity in China’s drylands: Through complementary or mass ratio effects?

Hao Guoa,b,c, Hong-Hu Mengd, Jin-Fei Yine, Tong Lia,b,c, Ben-Feng Yina,b,c, Xiao-Bing Zhoua,b,c, Yuan-Ming Zhanga,b,c   

  1. a. State Key Laboratory of Desert and Oasis Ecology, Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
    b. Xinjiang Key Laboratory of Biodiversity Conservation and Application in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
    c. Xinjiang Field Scientific Observation Research Station of Tianshan Wild Fruit Forest Ecosystem, Yili Botanical Garden, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
    d. Plant Phylogenetics and Conservation Group, Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China;
    e. School of Life Sciences, Hebei University, Baoding 071002, China
  • Received:2025-11-26 Revised:2026-04-29 Accepted:2026-04-30 Online:2026-05-12 Published:2026-07-25
  • Contact: Xiao-Bing Zhou,E-mail:zhouxb@ms.xjb.ac.cn;Yuan-Ming Zhang,E-mail:ymzhang@ms.xjb.ac.cn
  • Supported by:
    This study was also supported by the Leading Talents in Sci-Technological Innovation Project of the “Tianshan Talent” Training Plan of Xinjiang Uygur Autonomous Region (2022TSYCLJ0058), the Natural Science Foundation of Xinjiang Uygur Autonomous Region (2022D01D83), the Tianchi Talent Introduction Project of Xinjiang Uygur Autonomous Region (E4350113), the National Natural Science Foundation of China (42471072), and the Xinjiang Tianshan Talent Project (2022TSYCCX0007).

How does plant diversity drive productivity in China’s drylands: Through complementary or mass ratio effects?

Hao Guoa,b,c, Hong-Hu Mengd, Jin-Fei Yine, Tong Lia,b,c, Ben-Feng Yina,b,c, Xiao-Bing Zhoua,b,c, Yuan-Ming Zhanga,b,c   

  1. a. State Key Laboratory of Desert and Oasis Ecology, Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
    b. Xinjiang Key Laboratory of Biodiversity Conservation and Application in Arid Lands, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
    c. Xinjiang Field Scientific Observation Research Station of Tianshan Wild Fruit Forest Ecosystem, Yili Botanical Garden, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
    d. Plant Phylogenetics and Conservation Group, Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Kunming 650223, China;
    e. School of Life Sciences, Hebei University, Baoding 071002, China
  • 通讯作者: Xiao-Bing Zhou,E-mail:zhouxb@ms.xjb.ac.cn;Yuan-Ming Zhang,E-mail:ymzhang@ms.xjb.ac.cn
  • 基金资助:
    This study was also supported by the Leading Talents in Sci-Technological Innovation Project of the “Tianshan Talent” Training Plan of Xinjiang Uygur Autonomous Region (2022TSYCLJ0058), the Natural Science Foundation of Xinjiang Uygur Autonomous Region (2022D01D83), the Tianchi Talent Introduction Project of Xinjiang Uygur Autonomous Region (E4350113), the National Natural Science Foundation of China (42471072), and the Xinjiang Tianshan Talent Project (2022TSYCCX0007).

Abstract: Dryland biodiversity-productivity relationships remain poorly resolved. Specifically, the environmental conditions governing the shift between complementarity and mass ratio mechanisms remain unclear, limiting the effectiveness of restoration and management strategies. To address this gap, the aim of this study was to investigate the geographical patterns of diversity and biomass production in herbaceous communities along a 2100-km precipitation gradient in North China. We studied how α- and β-diversity affect community-wide productivity using linear mixed-effects models and piecewise structural equation models, along with rolling-window change-point analyses. In arid regions, biomass productivity was primarily driven by interspecific niche complementarity, where higher functional diversity (FD(α)) enhanced resource-use efficiency. However, in semi-arid regions, productivity was regulated by the mass ratio effect, specifically through the traits of dominant species, including community weighted mean height and specific leaf area, as these species exploited broader resource spectra with increasing water availability. A critical mechanistic shift occurred at a mean annual precipitation (MAP) threshold of ∼168 mm (95% CI: 152-171 mm; p < 0.001). Below this threshold, productivity was driven by diversity-mediated complementarity and stress tolerant strategies. Conversely, as MAP surpassed 168 mm, the system transitioned to mass ratio control, coincident with a shift toward competitive strategies. Overall, our study provides empirical evidence to guide dryland management: prioritising the maintenance of functional diversity in arid communities, while emphasising dominant-trait optimisation (plant height and specific leaf area) in semi-arid communities to maximise aboveground biomass.

Key words: Biodiversity, Aboveground biomass (AGB), Complementarity effect, Mass ratio effect, CSR strategy, Threshold effect

摘要: Dryland biodiversity-productivity relationships remain poorly resolved. Specifically, the environmental conditions governing the shift between complementarity and mass ratio mechanisms remain unclear, limiting the effectiveness of restoration and management strategies. To address this gap, the aim of this study was to investigate the geographical patterns of diversity and biomass production in herbaceous communities along a 2100-km precipitation gradient in North China. We studied how α- and β-diversity affect community-wide productivity using linear mixed-effects models and piecewise structural equation models, along with rolling-window change-point analyses. In arid regions, biomass productivity was primarily driven by interspecific niche complementarity, where higher functional diversity (FD(α)) enhanced resource-use efficiency. However, in semi-arid regions, productivity was regulated by the mass ratio effect, specifically through the traits of dominant species, including community weighted mean height and specific leaf area, as these species exploited broader resource spectra with increasing water availability. A critical mechanistic shift occurred at a mean annual precipitation (MAP) threshold of ∼168 mm (95% CI: 152-171 mm; p < 0.001). Below this threshold, productivity was driven by diversity-mediated complementarity and stress tolerant strategies. Conversely, as MAP surpassed 168 mm, the system transitioned to mass ratio control, coincident with a shift toward competitive strategies. Overall, our study provides empirical evidence to guide dryland management: prioritising the maintenance of functional diversity in arid communities, while emphasising dominant-trait optimisation (plant height and specific leaf area) in semi-arid communities to maximise aboveground biomass.

关键词: Biodiversity, Aboveground biomass (AGB), Complementarity effect, Mass ratio effect, CSR strategy, Threshold effect