For T3, a positive trend was characterized, suggesting that an increase in the frequency of forage harvest from mowing once per three years (T4) to mowing once per year (T3) had triggered a direction flip for the AGB-diversity relationship from negative correlation to positive correlation.
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Enclosure in Combination with Mowing Simultaneously Promoted Grassland Biodiversity and Biomass Productivity.
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The sentences
Relationship between AGB and Plant Diversity Regression analyses showed that a negative trend existed between AGB and plant diversity.