植物代谢速率随年龄增长的时间动态规律，是掌握植物活性衰退规律的关键科学基础，然而目前并没有关于沙柳（Salix psammophila）代谢速率年龄动态规律的系统研究，且以往植物代谢规律相关研究往往忽略了植物所处的微空间环境，严重影响了代谢规律研究结果的普适性。本项目通过监测沙丘迎风坡、背风坡、丘间地以及半固定平坦沙地四种典型微空间条件下1-10年龄沙柳的光合、呼吸代谢速率，开展沙柳代谢的年龄动态规律的研究。研究内容主要包括（1）沙柳代谢速率的年龄动态规律；（2）沙柳代谢速率的微空间异质性；（3）沙柳代谢速率年龄动态的环境影响因素。预期结果不仅丰富了植物代谢相关研究的理论基础，弥补了以沙柳外在生长规律判断沙柳衰退的传统方法的片面性，更有助于全面掌握基于沙柳的生理活性的衰退规律，为因地制宜的进行沙柳经营管理提供理论支持。

Plant metabolic rate regularity of age contributes to understanding of the life activity declines with age. However, there has been no systematic research on Salix psammophila metabolic rate in each age. Moreover, the micro topographies were always ignored in plant metabolic regularity research in the past, which leading to the studying results failing in universal applicable. In this study, metabolic rate changes with the age will be analyzed on the basis of the on-site observation of the metabolic rate (photosynthesis and respiration rate) of 1-10 ages separately in four typical micro topographies - windward slope, leeward slope, between sand dune and semi-fixed sand. The contents of this study are: (1) to characterize the S. psammophila metabolic rate regularity along ages; (2) to reveal the difference of S. psammophila metabolic rate regularity along ages in different micro topographies; (3) to quantify the environmental factors effects on S. psammophila metabolic rate regularity along ages, and reveal the main effect factors. The expected results will not only enrich the theory basis of plant metabolism related research, offer a supplement for understanding of S. psammophila life activity declines with age in the aspect of physiological metabolism, but can contribute to a comprehensive solution for S. psammophila management according to local conditions.