Vegetation restoration in western Liaoning hilly region: A study based on succession theory and degradation degree of ecosystem Early diagnosis of low-value forest: An approach of ecological factors Vulnerability evaluation and regionalization of drought disaster risk ofmaize in Northwestern Liaoning Province Assessment of ecological benefits of Chinese pine in soil and water conservation forests in Western Liaoning Province Quantitative measurement on degradation degree of ecosystem in hilly region of western Liaoning Province Effect of Different Planting Patterns on Maize Growth and Yield in Western Liaoning Province