Improvement upon the parameter estimation models of the fecundity table of insect experimental population when adult period longer than that of larva Contrast in vegetation net primary productivity estimation models and ecological effect value evaluation in Northwest China THE SENSITIVITY OF VARIOUS DEVELOPMENT STAGES OF MAIZE WEEVIL TO PHOSPHINE A study on tfae indirect valuation of tfae forest ecosystem in Baiyun Mountain Ecosystem services and their valuation of China grassland Selection of reference genes for real-time fluorescence quantitative PCR in Nerviliao Fordii Folium