Study on Changes of Grassland Biomass Carbon in Yili River Valley
By studying the distribution pattern of grassland biomass carbon under different altitude gradients,the carbon stock of ecosystems under different altitude gradients can be assessed,providing scientific basis for eco-system carbon balance and carbon management.This paper investigated the distribution characteristics and corre-lation between aboveground biomass carbon of grassland and soil environmental factors at different altitude gradi-ents in the Ili River Valley,and the results showed that:①with the rise in altitude,soil temperature showed a fluc-tuating downward trend,and soil water content and salinity showed a fluctuating upward trend.The soil tempera-ture,water content and salinity in the altitude gradient H1-H10(1000～2500m)were at 10.87 19.97° C,8.42％～40.17％and 0～1.31 g/kg,respectively.②Aboveground biomass carbon stock in grassland showed a trend of"decrease-increase-decrease"with the increase of elevation in May,with the maximum of 234 g/Cm2 at H9(2100～2200 m),and"increase-decrease-increase"at H2(1200～1300 m)in July;on spatial distribution,aboveground biomass carbon stock showed a trend of"west-high"in May,with the maximum of 296.44 gC/m2.In July,there was an"increase-decrease-increase"trend,with a maximum of 296.44 gC/m2 at H2(1200～1300 m);in terms of spatial distribution,the aboveground biomass carbon stock showed a"west-high-east-low"distribution in May,and the opposite trend was observed in July.③ Aboveground biomass carbon stocks at altitude H8(2000～2100m)were significantly negatively correlated with soil temperature and positively correlated(P＜0.05)with both soil moisture and vegetation leaf area index.
Yili river Valleydifferent altitudinal gradientsaboveground biomass carbonenvironmental factors
NETL
NSTL
万方数据
维普
