Li Bin, Tang Guo-Yong, Li Kun, Gao Cheng-Jie, Liu Fang-Yan, Wang Xiao-Fei
Research Institute of Resource Insects, Chinese Academy of Forestry, Kunming 650224, China.
Ying Yong Sheng Tai Xue Bao. 2013 Jun;24(6):1479-86.
By using layering harvest method, a comparative study was conducted on the biomass allocation and its spatial distribution of 20-year-old Eucalyptus camaldulensis plantation, Leucaena leucocephala plantation, and E. camaldulensis-L. leucocephala plantation in Yuanmou dry-hot valley of Yunnan Province, Southwest China. The stand biomass in the mixed E. camaldulensis-L. leucocephala plantation (82.99 t x hm(-2)) was between that of monoculture E. camaldulensis plantation (60.64 t x hm(-2)) and L. leucocephala plantation (127.79 t x hm(-2)). The individual tree biomass of E. camaldulensis in the mixed plantation (44.32 kg) was 49.8% higher than that in monoculture plantation (29.58 kg). The branch and leaf biomass of L. leucocephala (25.4%) in monoculture plantation was larger than that of E. camaldulensis (8.9%) in monoculture plantation, and the aboveground biomass distribution ratio (78.0%) of L. leucocephala (25.4%) was also higher than that of E. camaldulensis (73.4%). The roots of L. leucocephala in both monoculture and mixed plantations were mainly distributed in 0-40 cm soil layer, while those of E. camaldulensis in monoculture and mixed plantations were mainly found in 0-80 cm and 0-60 cm, respectively. The proportion of biomass allocated to roots including medium roots, small roots, and fine roots of L. leucocephala in mixed plantation was higher than that in monoculture plantation, but it was contrary for E. camaldulensis. It was suggested that introducing L. leucocephala in E. camaldulensis plantation promoted the growth of E. camaldulensis, especially for its aboveground biomass, and increased the amount of lateral roots in 0-20 cm soil layer, which had significance in soil and water conservation in the study area.
采用分层收获法，对中国西南部云南省元谋干热河谷中20年生的赤桉人工林、银合欢人工林以及赤桉 - 银合欢混交林的生物量分配及其空间分布进行了比较研究。赤桉 - 银合欢混交林的林分生物量（82.99 t·hm⁻²）介于纯林赤桉人工林（60.64 t·hm⁻²）和银合欢人工林（127.79 t·hm⁻²）之间。混交林中赤桉单株生物量（44.32 kg）比纯林中赤桉单株生物量（29.58 kg）高49.8%。纯林中银合欢的枝叶生物量（25.4%）大于纯林中赤桉的枝叶生物量（8.9%），银合欢的地上生物量分配比例（78.0%）也高于赤桉（73.4%）。纯林和混交林中银合欢的根系主要分布在0 - 40 cm土层，而纯林和混交林中赤桉的根系分别主要分布在0 - 80 cm和0 - 60 cm土层。混交林中银合欢分配到包括中根、小根和细根在内的根系生物量比例高于纯林，但赤桉的情况则相反。研究表明，在赤桉人工林中引入银合欢促进了赤桉的生长，尤其是地上生物量，并增加了0 - 20 cm土层中侧根的数量，这对研究区域的水土保持具有重要意义。
