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Tentative Ideas for Agricultural Development in Sandy Area in the Lower Reaches of Luan River A Comparative Researches on Landscape Diversity Changes in Two Typical Desertification Areas——Impacts of Landscape Matrices Variation in Transpiration of Populus bolleana and the Influence Factors in Maowusu Sandy Area Investigation on the structure of the protective forest belt in sandy area in Maowusu Calibration of relevant parameters of reference crop evapotranspiration with genetic algorithm Analysis of ecological health status at time scale in sandy area Plant Community Species Diversity of Desert Steppe in Sandy Area of Eastern Ningxia Multilevel fuzzy compositive evaluation (MFCE) of ecosystem health of artificial sand-fixing plants and instantiation analyze Analysis on moisture niche fitness and interspecific coexistence of artificial forest plants in Shapotou Area Transpiration Rule of Pinus sylvestris var. mongolica and Its Relation to the Canopy Micrometeorology in Mu Us Sandy Area Study on Forest Type/Tree Species Structure Optimization of Yanchi Sandy Area Eco-economical Shelterbelt System in Ningxia