不同林龄福建柏纯林与混交林生长及养分的差异  

Differences in Growth and Nutrients between Pure and Mixed Forest of Fokienia hodginsii with Different Forest Ages

作　　者：李秉钧 陈乾 王希贤 荣俊冬[1] 陈礼光[1] 郑郁善[1] LI Bingjun;CHEN Qian;WANG Xixian;RONG Jundong;CHEN Liguang;ZHENG Yushan(Forestry College of Fujian Agriculture and Forestry University, Fuzhou 350002, China)

机构地区：[1]福建农林大学林学院,福州350002

出　　处：《西北植物学报》2022年第4期694-704,共11页Acta Botanica Boreali-Occidentalia Sinica

基　　金：福建省种苗科技攻关六期项目;福建省科技厅重大专项(2018NZ0001-1);福建农林大学科技发展创新基金(KF2015085)。

摘　　要：以不同林龄的福建柏[Fokienia hodginsii(Dunn)Henry et Thomas]为研究对象,比较两种人工林(纯林和混交林)经营模式下福建柏不同时期生长指标及器官养分的差异,并结合各器官养分随林龄增长的变化趋势,以揭示福建柏生长特性与养分含量间的相关性。结果表明:(1)随着林龄增加,两种经营模式的福建柏密度均显著减小,但总蓄积逐渐增加,而混交模式下福建柏不同生长时期的各项生长指标均优于同林龄的纯林。(2)两种营林模式下的福建柏叶片碳(C)、氮(N)元素含量均随着林龄增加呈上升趋势;磷(P)含量在15年生时最高,在生长前中期混交林P含量均显著高于纯林;钾(K)含量则在21年生时达到峰值,而混交林叶片K含量也低于纯林,这种差异在33年生时达到显著水平。(3)枝条N、K含量随林龄增加而减少,纯林枝条K含量高于混交林,混交林N含量则高于纯林;两种经营模式福建柏枝条C含量变化差异不显著,P含量则呈相反变化趋势。(4)树干C含量随着林分生长而增加,N含量先下降后上升,树干P含量随着林龄增加显著下降,且混交林P含量低于纯林,但差异不显著;纯林树干K含量在生长前期略高于混交林,但在生长中后期其含量显著降低,混交林K含量则显著升高。(5)根的C、N含量均随着林龄增加而减少,混交效益显著降低了根的C含量,并提高了其N含量;P与K含量变化差异较大,混交效益也会促进二者在福建柏根中的含量。To clarify the correlation between the growth characteristics of Fokienia hodginsii and nutrient content,we took F.hodginsii of different ages as the research object,compared the differences in the growth indexes and organ nutrients of F.hodginsii at different stages under the two stand models,and combined the changes in the nutrients of each organ with the growth of the forest age trend.The results showed that:(1)with the increase of the forest age,the density of the two forest models decreased significantly,but the total accumulation gradually increased,and the growth indicators of the different growth periods of F.hodginsii under the mixed model were better than those of pure forests of the same age.(2)The contents of carbon(C)and nitrogen(N)elements in the leaves of F.hodginsii under the two forest management models showed an upward trend with the increase of forest age;the phosphorus(P)content was the highest at 15 years of age,and was significantly higher than that of pure forest in early and middle growth period;the potassium(K)content reached the peak at 21 years old,while the K content of mixed forest leaves was lower than that of pure forest,and this difference reached significant at 33 years old.(3)The N and K contents of branches decreased with the increase of forest age.The content of K in branches of pure forest was higher than that of mixed forest,and the content of N in mixed forest was higher than that of pure forest.There was no significant difference in C content in the branches of the two forests of F.hodginsii,but the P content showed an opposite trend.(4)The trunk C content increased with the growth of the forest,the N content first decreased and then increased,the trunk P content decreased significantly with the increase of the forest age,and the P content of the mixed forest was lower than that of the pure forest,but the difference was not significant.The K content in the trunk of the pure forest was slightly higher than that of the mixed forest in the early growth period,but its content w

关 键 词：林分年龄 福建柏 营林模式 器官养分 生长指标 

分 类 号：Q948.121[生物学—植物学] S791.43[农业科学—林木遗传育种]