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Impact of a biochar or a biochar-compost mixture on water relation, nutrient uptake and photosynthesis of Phragmites karka

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Pedosphere 2020年第4期30卷 466-477页

作者： Zainul ABIDEEN Hans-Werner KOYRO bernhard huchzermeyer Bilquees GUL M.Ajmal KHAN Institute of Sustainable Halophyte Utilization University of KarachiKarachi 75270(Pakistan) Institute of Plant Ecology Justus Liebig University GiessenGiessen D-35392(Germany) Institute of Botany Gottfried Wilhelm Leibniz UniversityHannover D-30419(Germany)

Soil water and nutrient status are both of major importance for plant appearance and growth *** objective of this study was to understand the effect of biochar(1.5%)and a biochar-compost mixture(1.5%biochar+1.5%compost)on the performance of Phragmites karka plants grown on a synthetic nutrient-poor sandy clay soil(50% sand,30% clay,and 20% gravel).Indicators of plant performance,such as growth,lignocellulosic biomass,water status(leaf water potential,osmotic potential,and turgor potential),mineral nutrition status,leaf gas exchange,and chlorophyll fluorescence,and soil respiration(carbon dioxide(CO2)flux)were assessed under greenhouse ***-treated plants had higher growth rates and lignocellulosic biomass production than control plants with no biochar and no *** was also a significant increase in soil respiration in the treatments with biochar,which stimulated microbial *** increase in soil water-holding capacity after biochar amendment caused significant improvements in plant water status and plant ion(K^+,Mg^2+,and Ca^2+)contents,leading to an increase in net photosynthesis and a higher energy-use efficiency of photosystem ***-treated plants had lower oxidative stress,increased water-use efficiency,and decreased soil respiration,and the biochar-compost mixture resulted in even greater improvements in growth,leaf turgor potential,photosynthesis,nutrient content,and soil gas *** results suggest that biochar and compost promote plant growth with respect to nutrient uptake,water balance,and photosynthetic system *** summary,both the soil amendments studied could increase opportunities for *** to sequester CO2 and produce more fodder bio-active compounds and biomass for bio-energy on nutrient-poor degraded soils.

关键词： bio-energy crop chlorophyll fluorescence degraded soil plant eco-physiology plant growth photochemical efficiency water status

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