放牧
生物量(生态学)
高原(数学)
环境科学
生态系统
农学
生长季节
氮气
动物科学
生态学
生物
化学
数学
数学分析
有机化学
作者
Yongheng Gao,Peng Luo,Ning Wu,Yi Shaoliang,Huai Chen
摘要
This study was conducted to
examine the seasonal dynamics of biomass and
plant nitrogen (N) content under three grazing
intensities (light grazing – LG: 1.2, moderate
grazing – MG: 2.0, and heavy grazing – HG: 2.9
yaks ha–1) in representative alpine meadow on
the eastern Tibetan Plateau. Differentiation in
grazing intensity in the study area started since
1997 and has continued to the present time. Plant
samples were collected in the middle of June, August
and September. The highest aboveground
biomass occurred at the MG site for both August
and September. Over the growing season, belowground
biomass (0–30 cm) increased as grazing
intensity increased. The total belowground biomass
averaged over all sampling dates was 1226,
1908 and 2244 g m–2 for LG site, MG site and HG
site, which accounted for 75, 81 and 88% of total
biomass, respectively. The results suggested
that grazing intensity changed biomass allocation
pattern between aboveground and belowground
parts of plants. Higher grazing intensity resulted
in higher N concentration in both live and dead
aboveground biomass over the study period. Increased
grazing intensity tended to increase plant
N content averaged over all sampling dates, which
were 17.9 g m–2, 23.8 g m–2 and 27.6 g m–2 in LG
site, MG site and HG site. The results indicated
that higher grazing intensity had a potential to
increase the ecosystem pool of plant N.
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