Open AccessBiochar amendment boosts photosynthesis and biomass in C 3 but not C 4 plants: A global synthesis
Author(s) -
He Yanghui,
Yao Yixian,
Ji Yuhuang,
Deng Jun,
Zhou Guiyao,
Liu Ruiqiang,
Shao Junjiong,
Zhou Lingyan,
Li Na,
Zhou Xuhui,
Bai Shahla Hosseini
Publication year - 2020
Publication title -
gcb bioenergy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.378
H-Index - 63
eISSN - 1757-1707
pISSN - 1757-1693
DOI - 10.1111/gcbb.12720
Subject(s) - biochar , amendment , photosynthesis , biomass (ecology) , slash and char , transpiration , agronomy , stomatal conductance , environmental science , bioenergy , chemistry , biofuel , biology , botany , pyrolysis , microbiology and biotechnology , law , organic chemistry , political science
Biochar is a carbon (C)‐rich solid produced from the thermochemical pyrolysis of biomass. Its amendment to soils has been proposed as a promising mean to mitigate greenhouse gas emissions and simultaneously benefit agricultural crops. However, how biochar amendment affects plant photosynthesis and growth remains unclear, especially on a global scale. In this study, we conducted a global synthesis of 74 publications with 347 paired comparisons to acquire an overall tendency of plant photosynthesis and growth following biochar amendment. Overall, we found that biochar amendment significantly increased photosynthetic rate by 27.1%, and improved stomatal conductance, transpiration rate, water use efficiency, and chlorophyll concentration by 19.6%, 26.9%, 26.8%, and 16.1%, respectively. Meanwhile, plant total biomass, shoot biomass, and root biomass increased by 25.4%, 22.1%, and 34.4%, respectively. Interestingly, plant types (C 3 and C 4 plants) showed greater control over plant photosynthesis and biomass than a broad suite of soil and biochar factors. Biochar amendment largely boosted photosynthesis and biomass on C 3 plants, but had a limited effect on C 4 plants. Our results highlight the importance of the differential response of plant types to biochar amendment with respect to plant growth and photosynthesis, providing a scientific foundation for making reasonable strategies towards an extensive application of biochar for agricultural production management.