Measuring seasonal dynamics of leaf area index in a mixed conifer-broadleaved forest with direct and indirect methods Improving the accuracy of indirect methods in estimating leaf area index using three correc-tion schemes in a Larix gmelinii plantation Sampling method for rapid measurement of leaf area index by leaf litter collection in deciduous forests Estimation of seasonal changes in leaf area index based on optical methods in spruce-fir valley forest. Using litter collection and tree data to model leaf area index in the mixed broadleaved-Korean pine forest in the Xiaoxing‘an Mountains, China