摘要
为探明3个不同年龄橡胶(Hevea brasiliensis)林下萝芙木(Rauvolfia vomitoria)、大叶千斤拔(Flemingia macrophylla)及复合系统与橡胶纯林的年生长量及生物量,根据3个林龄(8、11和20 a)两种不同种植模式各样地的调查数据,计算了不同种植模式中橡胶、大叶千斤拔及萝芙木的年生长量。同时利用49和29株不同大小的大叶千斤拔和萝芙木样木个体建立了以基径平方乘以高度(BD2H)为自变量的生物量回归模型,根据所建立的生物量回归模型估算了不同种植模式各林分的生物量及生物量增量,并对其组成和分配特征进行了分析。结果表明:8、11和20 a生复合模式中的橡胶、大叶千斤拔和萝芙木的胸径或基径的年生长量和生物量增量均随着橡胶年龄的增大而减少,其橡胶的年胸径生长量分别是同龄橡胶纯林的1.16、1.01和1.17倍,年生物量增量分别是同龄橡胶纯林的1.13、1.08和1.49倍;3个林龄复合模式和橡胶纯林的总生物量均随林龄的增大而增长,而生物量增量随林龄而下降;复合模式的总生物量分别是其同龄橡胶纯林的2.35、1.60和1.17倍,生物量增量(53.20、33.64和11.18 t·hm-2)分别是同龄橡胶纯林的5.13、4.48和2.63倍;不论是复合模式还是橡胶纯林,其生物量器官分配均呈现出茎和枝所占的比例随林龄而增长,叶和根所占的比例随林龄而下降的规律。在橡胶林下种植其他植物种类,能显著提高生物量积累。
Mixedspecies forest plantations have been established in a large area in the tropics of China, playing an important role in carbon sequestration. To understand the changes in annual growth and biomass allocation, we investigated height （H）, diameter at breast height （D） and basal diameter （BD） from different aged rubber plantations （8-, 11- and 20-year-old） mixed with Rauvolfia vomitoria and Flemingia macrophylla （RM） and adjacent pure rubber plantations （CK） in Xishuangbanna, in December 2013 and 2014. Also, the biomass regression models were established. The annual growth in D or BD and biomass increment of different trees in RM decreased with increasing stand age. The D’s annual growth of rubber trees in 8-, 11- and 20-year-old RM was 1.16, 1.01 and 1.17 times of that in CK, with annual biomass increment being 1.13, 1.08 and 1.49 times, respectively. The total biomass was 111.16, 112.53 and 119.53 t·hm^-2 in the 8-, 11- and 20-year-old RM, respectively, being 1.35, 0.60 and 0.17 times higher than that in CK. However, the total biomass increment decreased with stand age, ranging from 53.20 t·hm^-2 in 8-year-old RM, 33.64 t·hm^-2 in 11yearold RM to 11.18 t·hm^-2 in 20-year-old RM, which were 5.13, 4.48 and 2.63 times of that in CK respectively. The relative contributions of stems and branches to total biomass increased with stand age in both RM and CK, while the contributions of leaves and roots decreased. The results suggest that biomass accumulation will be greatly enhanced by constructing mixed-species rubber plantation.
出处
《生态学杂志》
CAS
CSCD
北大核心
2016年第7期1704-1712,共9页
Chinese Journal of Ecology
基金
中国科学院农业项目办公室资助项目(KSCX2-EW-B-12和KSCX2-YW-N-44-09)
西双版纳州科技局资助项目(200915和YX201102)
中国科学院"一三五"专项(XTBG-T03)和中国科学院STS项目(KFJ-EW-STS-084)资助
关键词
橡胶
复合生态系统
生长量
生物量
rubber
complex ecosystem
growth increment
biomass.
