晋西黄土丘陵区柠条生长规律研究

摘要

Caragana korshinskii is a very important thrub in Loess Plateau .Study of the growth characteristics of Caragana korshinskii has great significance for management in Loess hilly area .Based on the data of the analytical trees ,appropriate growth regularity models of branch diameter and branch height were established .The average increment and current annual increment curves were obtained to analyze the growth characteristics .The results showed that the Weibull model was the op-timal model for branch diameter and branch height in Loess hilly area .The growth rate was relatively high when the bran-ches age were between 4 and 9 years old.The current annual increments of branch diameter and branch height increased apparently at 8a,the highest value of average increment of branch height was 3 years earlier than that of branch diameter . Manual intervention should be adopted within 11a in order to prolong the fast growing period and enhance the productivity of Caragana korshinskii forest.%柠条是黄土高原地区重要的灌木树种,研究其生长规律对黄土丘陵区柠条灌木林的合理经营管理具有重要的意义. 以晋西黄土丘陵区方山县柠条标准枝的解析资料为基础进行回归分析,确定柠条枝径、枝高的最优生长模型,并用实测数据绘制枝径、枝高的连年生长量和平均生长量曲线,对柠条生长进行分析. 结果表明,晋西黄土丘陵区柠条的枝径、枝高均以韦布尔模型为最优生长模型,枝龄在4a~9a时,柠条的生长速率相对较快;枝径和枝高的连年生长量均在8a时增长最快;而平均生长量增长最快的时间不同,枝高平均生长量达到最大值的时间为8 a,枝径为11 a,枝高比枝径早3 a.在11 a内进行柠条人工干预有助于延长柠条灌木林的速生期,保证林地拥有最大的生产力.