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Effect of shrub coverage on grassland ecosystem carbon pool in southwestern China
XUE Jing-Yue, WANG Li-Hua, XIE Yu, GAO Jing, HE Jun-Dong, WU Yan
Chin J Plant Ecol    2019, 43 (4): 365-373.   DOI: 10.17521/cjpe.2017.0062
Abstract   (1236 HTML135 PDF(pc) (1105KB)(1165)  

AimsThe grassland in southwestern China is mainly warm and tropical grass and shrub grassland, accounting for approximately one-tenth of the national grassland area. Analysis of the relationship between shrub coverage and the grassland carbon pool and its composition is of great significance for accurately assessing carbon storage in the southwestern grassland, which grassland is still in the secondary succession stage.
MethodsIn a field investigation, 41 representative plots of different geomorphic types in southwestern China were divided into three types according to shrub coverage: no shrub grassland community (shrub coverage is 0), low shrub coverage grassland community (shrub coverage is 0-10%) and high shrub coverage grassland community (shrub coverage is 10%-30%). Carbon density was calculated by measuring the aboveground and underground biomass and litter biomass of grassland communities at different shrub coverage levels, as well as plant and soil carbon content.
Important findings The results showed that with increasing shrub coverage and species richness in grasslands, the ecosystem vegetation carbon density increased from 0.304 kg·m -2 to 1.574 kg·m -2, and the roots and litter carbon density also showed growth trends. The soil carbon density increased from 7.215 kg·m -2 to 9.735 kg·m -2, and the ecosystem carbon density increased from 7.519 kg·m -2 to 11.309 kg·m -2, with increasing shrub coverage. Regarding the composition of the grassland carbon pool, the soil carbon pool of the low shrub coverage grassland accounted for the smallest proportion of the ecosystem carbon pool. In summary, the increase in shrub coverage changes the composition of the grassland ecosystem carbon pool and leads to an increase in the amount of ecosystem carbon. Therefore, when estimating the grassland ecosystem carbon pool, it is necessary to overall plan for and take into account the changes in grassland shrub coverage in southern China.


灌木植物盖度 Shrub coverage 样地编号 Plots No. 草地类型 Vegetation types 主要物种 Main species
I 2, 5, 11, 13, 16, 20,
21, 23, 24, 30, 33, 34, 35, 37, 38, 39, 40, 41
暖性草丛, 白茅型
Warm-temperate tussock, Imperata cylindrica grassland type
白茅、荩草、车前、老鹳草、小蓬草、天名精
Imperata cylindrica, Arthraxon hispidus, Plantago asiatica, Geranium wilfordii, Conyza canadensis, Carpesium abrotanoides
II 1, 3, 4, 8, 9, 10, 12, 14, 15, 17, 18, 19, 22, 25, 27, 29, 31, 32 热性灌草丛, 具灌木的扭黄茅型
Tropical shrub tussock, Heteropogon contortus grassland type
车桑子、川滇绣线菊、野蔷薇、马桑、扭黄茅、野古草属植物
Dodonaea viscosa, Spiraea schneideriana, Rosa multiflora, Coriaria nepalensis, Heteropogon contortus, Arundinella spp.
III 6, 7, 26, 28, 36 暖性灌草丛, 具灌木的荩草型Warm-temperate shrub tussock,
Arthraxon hispidus grassland type
车桑子、川滇绣线菊、野蔷薇、火棘、蜡莲绣球、悬钩子属植物、车前、风轮菜、荩草、老鹳草
Dodonaea viscosa, Spiraea schneideriana, Rosa multiflora, Pyracantha fortuneana, Hydrangea strigosa, Rubus ssp., Plantago asiatica,
Clinopodium chinense, Arthraxon hispidus, Geranium wilfordii
Table 2 Grassland types and main species in grassland with different shrub coverage levels in southwestern China
Extracts from the Article
根据样方调查资料, 本试验41个样地共记录323种草本植物, 55种灌木植物。根据草地群落灌木植物盖度, 可将这41个样地分成3类: (1)无灌木植物草地群落(I), 指灌木植物盖度为0, 仅由草本植物组成的草本群落, 共18个样地。根据中国草地类型分类系统(中华人民共和国农业部畜牧兽医司全国畜牧兽医总站, 1996)划分草地类型, 草地类型为暖性草丛, 中禾草组, 白茅草地型。(2)低灌木植物盖度草地群落(II), 指灌木植物盖度0-10%的草本群落, 共18个样地。草地类型为热性灌草丛, 中禾草组, 具灌木的扭黄茅草地型。(3)高灌木植物盖度草地群落(III), 即灌木植物盖度10%-30%的草本群落, 共5个样地。草地类型为暖性灌草丛, 中禾草组, 主要为具灌木的荩草型。随着草地群落灌木植物盖度的增加, 草地类型从草丛变为灌草丛, 灌木种类和数量增多, 植物物种也更加丰富(表2)。
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