海南儋州地区低割龄橡胶树热研7-20-59茎粗生长月动态研究初报

Preliminary analysis on stem diameter month growth rhythm of low tapping age rubber tree clone CATAS7-20-59

探讨低割龄橡胶树热研7—20—59茎粗生长随月份时间变化的规律,为低割龄橡胶树生态管理和合理经营提供参考依据。对7割龄橡胶树品种热研7—20—59的茎粗生长进行定期、定株观测,利用回归分析方法对茎粗生长月动态进行分析。结果表明,低割龄橡胶树热研7—20—59茎粗生长量一年可达到2.76 cm;茎粗累积生长动态呈线性变化趋势,茎粗一年中月度增粗量呈现出明显的慢—快—慢的生长节律;构建了低割龄橡胶树热研7—20—59茎粗生长的回归模型Y=0.307X+61.307;根据聚类分析方法并结合橡胶树生长特点可将低割龄橡胶树热研7—20—59茎粗生长过程划分为速生前期(1—3月)、速生期(4—9月)和速生后期(10—12月);4—9月是低割龄橡胶树热研7—20—59茎粗生长关键时期,此时加强光热水和土肥等生态管理,可增加橡胶林生态系统生物量,进一步提高橡胶林生产力水平。

The rubber tree stem diameter growth of month variation for low tapping age rubber tree clone CATAS7-20-59was studied in order to provide reference for the ecological management technology.This article studied the stem diameter of seven tapping age rubber tree clone CATAS7-20-59based on periodic and pointing observation method.A regression model was used to analyze stem diameter month growth rhythm of low tapping age rubber tree clone CATAS7-20-59.The results showed that stem diameter growth of low tapping age rubber tree clone CATAS7-20-59could reach2.76cm,and cumulative growth dynamics of stem diameter showed linear trends,while net stem diameter monthly presented slow-fast-slow growth rhythm in the year.Stem diameter growth regression model Y=0.307X+61.307of low tapping age rubber tree ageCATAS7-20-59was constructed.The growth course of the stem diameter might be partitioned into three periods of time by the sequential clustering analysis,namely pre-growing stage(from January to March),fast-growing stage(from April to September)and late-growing stage(from October to December).April to September is stem diameter growth critical period of low tapping age rubber tree clone CATAS7-20-59,and this period is good to strengthen ecological management of light,water,fertilizer and water,increasing the rubber forest ecosystem biomass,and to further improve the level of rubber forest productivity.