黑河中游荒漠草地地上和地下生物量的分配格局  

Allocation patterns of above- and belowground biomass in desert grassland in the middle reaches of Heihe River, Gansu Province, China

作　　者：王敏[1] 苏永中[1] 杨荣[1] 杨晓[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所,中国生态系统研究网络临泽内陆河流域综合研究站,兰州730000

出　　处：《植物生态学报》2013年第3期209-219,共11页Chinese Journal of Plant Ecology

基　　金：中国科学院战略性先导科技专项(XDA-05050406-3)

摘　　要：草地生态系统中地上和地下生物量的分配方式对于研究生态系统碳储量和碳循环有着重要的意义。为了解黑河中游荒漠草地的地上和地下生物量分配格局,从群落和个体两个水平对黑河中游的地上和地下生物量进行了调查。结果表明:群落水平上地上生物量介于3.2–559.2g·m–2之间,地下生物量介于3.3–188.2g·m–2之间,个体水平上地上生物量介于6.1–489.0g·株–1之间,地下生物量介于2.4–244.2g·株–1之间,群落水平上的根冠比(R/S)为0.10–2.49,个体水平上为0.07–1.55,地下生物量均小于地上生物量,群落水平上R/S值大于个体水平。群落和个体水平地上和地下生物量的拟合斜率分别为1.1001和0.9913,与1没有显著差异,说明地上与地下生物量呈等速生长关系。群落和个体水平土壤表层0–20cm和0–30cm的根系生物量分别占全部根系生物量的89.81%、96.95%和81.42%、93.62%,表明地下生物量主要集中在0–20cm和0–30cm土壤表层。Aims The allocation of aboveand belowground biomass is highly meaningful in research of carbon storage and cycling in ecosystems. Our objective is to characterize biomass allocation patterns of desert grassland in the middle reaches of Heihe River, Gansu Province, China by providing a detailed study of allocation of aboveand belowground biomass. Methods We used the quadrat survey method to study aboveand belowground biomass of desert grassland in July-August, 2011. The allometric relationship between aboveand belowground biomass was fitted by the method of reduced major axis （RMA） regression. The vertical distribution pattern of belowground biomass was simulated by the root vertical distribution model developed by Gale and Grigal in 1987. Important findings Aboveand belowground biomass at the community level ranged from 3.2 to 559.2 g.m^-2 and 3.3 to 188.2 g.m^-2, respectively. Aboveand belowground biomass of individuals varied from 6.1 to 489.0 g and 2.4 to 244.2 g, respectively. The ratios of root to shoot （R/S） at community and individual levels were 0.10 to 2.49 and 0.07 to 1.55, respectively. Therefore, the aboveground biomass was greater than belowground biomass at both levels, and the R/S ratio was higher at the community level. The slopes of the fitted equations at the community and individual levels were 1.100 1 and 0.991 3, respectively. Neither was significantly different from 1, which means the allocation patterns between above- and belowground biomass were similar at both levels and indicates an isometric allocation relationship between aboveand belowground biomass. Belowground biomass was concentrated mainly in the 0-20 and 0-30 cm soil layers. Root biomass in the 0-20 cm soil depth accounted for 89.81% and 81.42% of the total root biomass at the community and individual levels, respectively. Parallel values for the 0-30 cm soil depth were 96.95% and 93.62%.

关 键 词：生物量 荒漠草地 等速生长关系 根冠比 地下生物量的垂直分布 

分 类 号：S812[农业科学—草业科学]