新疆不同植被类型土壤有机碳特征

准确评估不同植被类型的土壤有机碳库,对揭示土壤有机碳在陆地生态系统碳循环中的作用具有重要意义。通过分析新疆地区10种植被类型的土壤有机碳密度(SOCD)的分布特征,估算了该地区的土壤有机碳储量。结果表明:在10个植被类型的0~100 cm土壤剖面中,SOCD垂直分布特征明显,呈逐渐降低趋势。新疆SOCD以针叶林最大,其值为63.86 kg·m~(-2),其他植被类型依次为:草甸、阔叶林、沼泽、草原、灌丛、高山植被、栽培植被、荒漠和无植被类型。土壤有机碳储量最大值分布在草甸中,为4.89 Pg,其他植被类型依次为:荒漠、草原、高山植被、无植被(裸地)、针叶林、栽培植被、阔叶林、灌丛、沼泽。在0~100 cm的土壤层,新疆地区土壤有机碳储量为16.4Pg。

Characteristics of Soil Organic Carbon under Different Vegetation Types in Xinjiang

Accurate assessment on soil organic carbon pool under different vegetation types is of great importance in revealing the effect of soil organic carbon in the terrestrial carbon cycle.In this study,the distribution characteristics of soil organic carbon density (SOCD) under 10 vegetation types were comprehensively analyzed,and the soil organic carbon storage in Xinjiang was estimated.The main results showed that the vertical distribution of in 0-100 cm soil layer under the 10 vegetation types was obvious,and the SOCD was gradually decreased with the increase soil depth.The SOCD was the highest (63.86 kg · m-2) under coniferous forest in Xinjiang,and then followed by meadow,broad-leaved forest,swamp,grasslands,shrubbery,alpine vegetation,cultivated vegetation,desert and land without vegetation respectively.The maximum value of soil organic carbon storage occurred in meadow (4.89 Pg),and then followed by desert,grasslands,alpine vegetation,land without vegetation (bare land),coniferous forest,cultivated vegetation,broad-leaved forest,shrubbery and swamp successively.At the 0-100 cm soil layer,the soil organic carbon storage was 16.4 Pg in Xinjiang.