论文部分内容阅读
通过对长江滩地连续7年的水文动态以及滩地杨树人工林年轮生长序列的研究,分析杨树人工林个体生长与水淹时间、水淹深度以及气候因子的相应关系,建立相关模型.结果表明,林分个体胸径分布格局与滩地的高程具显著的相关性,水淹深度对直径生长的影响大于水淹的时间,而当年的径向生长与前一年8、9月水淹情况以及气候因子的关系明显.在滩地营造杨树人工林,以丰产为目的宜选择水淹深度小于2m的地域造林,淹水深度超过2m的地域宜适当密植,以培养小径材为主.
Based on the hydrological changes of the Yangtze River beach for seven consecutive years and the annual ring growth of poplar plantations, the corresponding relationships between individual growth and flooding time, flooding depth and climatic factors of poplar plantations were analyzed and the correlation models were established.Results The results showed that there was a significant correlation between the DBH distribution and the elevation of the beach land. The effect of flooding depth on diameter growth was greater than that of flooding, but the radial growth of the year was different from the flooding in August and September of the previous year and Climatic factors are obvious .In poplar plantations, it is better to select afforestation with water depth less than 2m for the purpose of high yielding. The areas with water depth exceeding 2m should be properly planted to cultivate small diameter timber.