赛罕乌拉国家级自然保护区不同草地类型植被碳密度及其分配

准确了解草地生态系统的碳密度及其分配,对于估算不同草地类型中的植被碳储存能力、判定碳汇、合理开发草地资源以及研究陆地生态系统碳循环具有重要意义。通过野外调查测定和室内分析,对内蒙古赛罕乌拉自然保护区草地生态系统的6种草地类型(线叶菊草原、贝加尔针茅草原、银穗草草原、林缘杂类草草甸、河谷草甸和蒙古冰草草原)的碳密度及其分配进行了研究。结果表明,赛罕乌拉自然保护区6种草地类型植被地上部分碳密度为89.61～240.20g/m2,地下部分碳密度为965.74～1520.00g/m2,植被总碳密度为1148.21～1616.99g/m2。在碳密度分配中,植被活体层、凋落物层和地下部分分别占总量的4.59%～12.81%、0.91%～6.56%和83.94%～94.43%,地下部分碳密度随土层深度增加而减少,0～10cm明显高于其他几层,平均占总量的56.86%。

The vegetation carbon density and distribution of different grassland patterns in Saihanwula national nature reserve

This study was conducted to accurately investigate the carbon distribution and density in the grassland ecosystem,which holds great significance for estimation of vegetation carbon storage,carbon trade judgment,rational investment of grassland resource and the study of carbon cycling on the land ecosystem for different grassland patterns.Based on the field and lab analysis,the carbon distribution and density of 6 different grassland patterns(Filifolium sibiricum grassland,Stipa baicalensis grassland,Leucopoa albida grassland,forest adjacent forbs meadow,valley meadow and Agropyron mongolicum grassland)in Saihanwula nature reserve were investigated.The results showed that the carbon densities of the aerial part range 89.61-240.20g/m2,underground part range 965.74-1520.00g/m2 and total vegetation carbon density varies within 1148.21-1616.99g/m2 in Saihanwula nature reserve.In the carbon distributions,vegetation living layer,litter layer and underground part range 4.59%-12.81%,0.91%-6.56% and 83.94%-94.43%,respectively.Carbon density of the underground part greatly varies according to the soil depths and the density in 0-10cm is significantly greater,seizing 56.86% of the total amount.