Carbon storage in the grasslands of China based on field measurements of above- and below-ground biomass
Carbon storage in the grasslands of China based on field measurements of above- and below-ground biomass
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DOI：
10.1007/s10584-007-9316-6
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发表时间：
2008-02-01
期刊：
影响因子：
4.8
通讯作者：
Yue, Yanzhen
中科院分区：
文献类型：
--
作者：
Fan, Jiangwen;Zhong, Huaping;Yue, Yanzhen
根据中国草地资源调查划分的17个草地群落类型，采用78个样点的系统重复取样和146个样点的公开记录，获得了地上和地下生物量值。大部分系统样本沿着从内蒙古海拉尔（北纬49度15 '，东经119度15'）到西藏普兰（北纬30度15 '，东经81度10'）的5,000公里长的样带。地上生物量分为茎、叶、花、果、立枯物和凋落物。地下生物量的测量，在10厘米的土层深度为30厘米的草本植物和50厘米的木本植物。草地类型的平均总生物量碳密度范围为2.400 kg m（-2）沼泽和0.149 kg m（-2）高寒荒漠草地。地下与地上碳密度的比值变化很大，从热带草丛草地的0.99到高寒草甸的52.28。地下生物量主要分布在0-10 cm土层，不同草地类型的地上生物量中活、死物质比例和茎叶比例差异较大。不同草地类型的生物量和分配的差异表现出与环境，特别是干旱梯度相关的模式。我们的估计与其他研究的比较表明，地上生物量，特别是牧草产量的生物量，是一个穷人的预测总植被碳密度。中国草地总生物量碳储量为3.32 Pg C，其中青藏高原草地占56.4%，北方温带草地占17.9%。强调需要进一步标准化和系统化的测量植被生物量，以验证全球碳循环。
Above- and below-ground biomass values for 17 types of grassland communities in China as classified by the Chinese Grasslands Resources Survey were obtained from systematic replicated sampling at 78 sites and from published records from 146 sites. Most of the systematic samples were along a 5,000-km-long transect from Hailar, Inner Mongolia (49 degrees 15'N, 119 degrees 15'E), to Pulan, Tibet (30 degrees 15'N, 81 degrees 10'E). Above-ground biomass was separated into stem, leaf, flower and fruit, standing dead matter, and litter. Below-ground biomass was measured in 10-cm soil layers to a depth of 30 cm for herbs and to 50 cm for woody plants. Grassland type mean total biomass carbon densities ranged from 2.400 kg m(-2) for swamp to 0.149 kg m(-2) for alpine desert grasslands. Ratios of below- to above-ground carbon density varied widely from 0.99 for tropical tussock grassland to 52.28 for alpine meadow. Most below-ground biomass was in the 0-10 cm soil depth layer and there were large differences between grassland types in the proportions of living and dead matter and stem and leaf. Differences between grassland types in the amount and allocation of biomass showed patterns related to environments, especially aridity gradients. Comparisons of our estimates with other studies indicated that above-ground biomass, particularly forage-yield biomass, is a poor predictor of total vegetation carbon density. Our estimate for total carbon storage in the biomass of the grasslands of China was 3.32 Pg C, with 56.4% contained in the grasslands of the Tibet-Qinghai plateau and 17.9% in the northern temperate grasslands. The need for further standardized and systematic measurements of vegetation biomass to validate global carbon cycles is emphasised.