元谋干热河谷20年生人工恢复植被生物量分配与空间结构特征

应用生态学报

元谋干热河谷20年生人工恢复植被生物量分配与空间结构特征

李彬¹,唐国勇^1,2,李昆^1,2**,高成杰¹,刘方炎^1,2,王小菲¹

(¹中国林业科学研究院资源昆虫研究所, 昆明 650224; ²国家林业局云南元谋荒漠生态系统定位研究站, 昆明 650224)

出版日期:2013-06-18 发布日期:2013-06-18

Vegetation biomass allocation and its spatial distribution after 20 years ecological restoration in a dry-hot valley in Yuanmou, Yunnan Province of Southwest China.

LI Bin¹, TANG Guo-yong^1,2, LI Kun^1,2, GAO Cheng-jie¹, LIU Fang-yan^1,2, WANG Xiao-fei¹

(¹Research Institute of Resource Insects, Chinese Academy of Forestry, Kunming 650224, China; ²Yuanmou Desertification Ecosystem Research Station, State Forestry Administration, Kunming 650224, China)

Online:2013-06-18 Published:2013-06-18

摘要/Abstract

摘要： 采用分层收获法,对元谋干热河谷20年生赤桉、新银合欢纯林及其混交林的生物量分配与空间结构进行对比研究.结果表明: 混交林林分生物量(82.99 t·hm^-2)介于赤桉纯林(60.64 t·hm^-2)与新银合欢纯林(127.79 t·hm^-2)之间;混交林内赤桉单株平均生物量(44.32 kg)较其纯林(29.58 kg)提高了49.8%.新银合欢纯林的枝叶生物量分配比例(25.4%)显著高于赤桉纯林(8.9%),且地上部生物量分配比例(78.0%)显著高于赤桉纯林(73.4%).新银合欢纯林及混交林中新银合欢的根系主要分布于0～40 cm土层, 赤桉纯林及混交林中赤桉的根系则主要分布于0～80 cm和0～60 cm土层.混交林中新银合欢的侧根(中根、小根和细根)分配比例均高于其纯林,而赤桉则相反.新银合欢的引入在一定程度上可促进赤桉生长,尤其是增加其地上部生物量及表层土壤(0～20 cm)中的侧根生物量,对该地区的水土保持具有重要意义.

Abstract: 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·hm^-2) was between that of monoculture E. camaldulensis plantation (60.64 t·hm^-2) and L. leucocephala plantation (127.79 t·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.

李彬1,唐国勇1,2,李昆1,2**,高成杰1,刘方炎1,2,王小菲1. 元谋干热河谷20年生人工恢复植被生物量分配与空间结构特征[J]. 应用生态学报.

LI Bin1, TANG Guo-yong1,2, LI Kun1,2, GAO Cheng-jie1, LIU Fang-yan1,2, WANG Xiao-fei1. Vegetation biomass allocation and its spatial distribution after 20 years ecological restoration in a dry-hot valley in Yuanmou, Yunnan Province of Southwest China.[J]. Chinese Journal of Applied Ecology.