【摘要】 通过研究不同海拔高度下草地生物量碳的分布规律，可以评估不同海拔高度下生态系统的碳储量，为生态系统碳平衡和碳管理提供科学依据。探究了伊犁河谷不同海拔高度下草地地上生物量碳与土壤环境因子的分布特征及相关关系，结果表明：(1)随着海拔上升，土壤温度呈现波动下降趋势，土壤含水量与盐分呈波动上升趋势。H1—H10(海拔1000～2500 m)土壤温度、含水量与盐分分别处于10.87～19.97℃、8.42%～40.17%与0～1.31 g/kg。(2)草地地上生物量碳储量在5月份随着海拔的升高，呈“降低—增加—降低”的变化趋势，H9(海拔2100～2200 m)时最大，为234gC/m~2,7月份呈“增加—降低—增加”的变化趋势，H2(海拔1200～1300 m)时最大，为296.44gC/m~2;空间分布上，5月份地上生物量碳储量呈现“西高东低”分布，7月份呈相反趋势。(3)H8(海拔2000～2100 m)时地上生物量碳储量与土壤温度呈显著负相关，与土壤水分和植被叶面积指数都呈显著正相关(P<0.05)。更多还原

【Abstract】 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 ecosystem carbon balance and carbon management. This paper investigated the distribution characteristics and correlation between aboveground biomass carbon of grassland and soil environmental factors at different altitude gradients in the Ili River Valley, and the results showed that:(1)with the rise in altitude, soil temperature showed a fluctuating downward trend, and soil water content and salinity showed a fluctuating upward trend. The soil temperature, 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.(2)Aboveground 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/Cm~2 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/m~2. In July, there was an "increase-decrease-increase" trend, with a maximum of 296.44 gC/m~2 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.更多还原