Study on evaluation method of grassland biomass loss from drought in Inner Mongolia

In order to study the evaluation method of grassland drought on pasture biomass loss, the article took Bayaertu grassland as an example, used the water deficit as Inner Mongolian grassland drought evaluation index, and established a loss evaluation model for pasture biomass on different growth stages. The result showed that there was significant Logistic curve relationship between biomass loss and the quantity of water deficit in grass turning green stage and vigorous growth stage. Integrated with pasture biomass reduction, ascertained the pasture biomass lose corresponding of different drought grades finally. This was suitable for the need of grassland drought monitor and disaster loss evaluation.