Allocation of vegetation biomass across a climate-related gradient in the grasslands of Inner Mongolia

被引:73
作者
Fan, J. W. [1 ,2 ]
Wang, K. [1 ]
Harris, W. [3 ]
Zhong, H. P. [2 ]
Hu, Z. M. [2 ]
Han, B. [2 ]
Zhang, W. Y. [2 ]
Wang, J. B. [2 ]
机构
[1] China Agr Univ, Inst Grassland Sci, Beijing 100193, Peoples R China
[2] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
[3] Landcare Res, Lincoln 7640, New Zealand
关键词
Biomass allocation; Grassland transect; Precipitation gradient; Temperature gradient; LEYMUS-CHINENSIS POACEAE; ROOT BIOMASS; PRIMARY PRODUCTIVITY; NET PRIMARY; DYNAMICS; PLANTS; RESPONSES; PATTERNS; STORAGE; TRAITS;
D O I
10.1016/j.jaridenv.2008.12.004
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071301 [植物生态学];
摘要
Biomass was measured at 48 undefoliated grassland sites on a 1900-km transect in Inner Mongolia. Above-ground biomass was separated into leaf, stern, flower and fruit, and dead matter, and into the five dominant species at each site. Below-ground biomass was measured to a depth of 30 cm and separated into 10-cm layers. Changes of these biomass components and their ratios were examined in relation to gradients of temperature and precipitation, and to the classification of the sites into five grassland types. Total biomass decreased markedly as site mean annual temperature increased and to a smaller extent as mean annual precipitation decreased. Averaged over all sites 92% of biomass was below ground. The proportion of below-ground biomass increased as temperature decreased, and was least and distributed more deeply in desert grassland. As aridity of the grassland types increased, the proportion of biomass in the first dominant species and in stem relative to leaf tissue increased. The biomass measurements provide baseline data required for monitoring sustainable use of Inner Mongolia grassland for livestock production and its storage of carbon.
引用
收藏
页码:521 / 528
页数:8
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