Remote sensing based productivity monitoring of sedge and forbs grasslands in Sichuan Province

The productivity of sedge and forbs grasslands in Sichuan Province was monitored by using both filed investigation and 3S technologies based on MODISNDVI. The result showed that the correlation coefficient of yield estimating mathematical model was 0.640 3 (P0.05). The estimated total editable fresh yields of sedge and forbs grasslands were 1 886 and 2 038 million tons, the average yields were 3 229.5 kg/hm2 and 3 489.0 kg/hm2, the vegetation coverage were 79.68% and 81.29%, the vegetation height was 7.08 cm and 16.03 cm, the edible proportion of grasses was 76.1% and 75.0% in 2006 and 2007 respectively. The yield in 2007 was 6.1% higher than that in 2006 and the yearly variation of rest parameters was not significant.