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在黄土高原自东南向西北,采用样带多点调查与定位监测相结合的研究方法,系统分析了不同草地类型封禁初期和封禁11 a草地生物量与固碳量变化特征。结果表明:4种草地类型地上活体植物、凋落物/地下活体根系和土壤中碳密度与碳储量分布规律均为森林草原>梁塬典型草原>丘陵典型草原>荒漠草原;草地封禁11 a,地上活体植物、凋落物0、～100 cm活体根系和土壤中碳密度总量,森林草原类型为63.38～97.65 t.hm-2,梁塬典型草原类型为49.04～68.80t.hm-2,丘陵典型草原类型为52.33～62.11 t.hm-2,荒漠草原类型为11.93～19.62 t.hm-2;碳储量4种草地类型分别为230.287 7 Tg C、332.306 7 Tg C、484.055 5 Tg C和113.856 3 Tg C;黄土高原草地总固碳量为573.10 Tg C,其中:活体植物为42.89 Tg C,占总固碳量的7.48%;凋落物为80.40 Tg C,占14.03%;活体根系为108.66 Tg C,占18.96%;土壤为341.15 Tg C,占59.53%。这充分表明,封禁不仅能使草地植被快速恢复和生物量增加,而且也是提高草地固碳潜力的一条重要途径。
In the study area from the southeast to the northwest of the Loess Plateau, the characteristics of biomass and carbon sequestration in the grassland during the initial and initial blockade of 11 a were systematically analyzed using the multi-point transect and location monitoring. The results showed that the distribution of carbon density and carbon storage in four grassland aboveground plants, litter / underground living root system and soil were all in the order of forest steppe> Liangliang typical steppe> hilly typical steppe> desert steppe; The total carbon density in living roots and soil from 0 to 100 cm in litter was 63.38-97.65 t.hm-2 in the forest grassland, 49.04-68.80 t.hm-2 in Liangyuan, The grassland types ranged from 52.33 to 62.11 t.hm-2, and the desert grassland types ranged from 11.93 to 19.62 t.hm-2. The carbon stocks of the four grassland types were 230.287 7 Tg C, 332.306 7 Tg C, 484.055 5 Tg C and 113.856 3 Tg C, and the total carbon sequestration in the Loess Plateau was 573.10 Tg C, in which 42.89 Tg C was the living plant, accounting for 7.48% of the total carbon sequestration; litter was 80.40 Tg C accounting for 14.03%; and the root biomass was 108.66 Tg C , Accounting for 18.96%; soil 341.15 Tg C, accounting for 59.53%. This fully shows that the embargo not only enables the rapid recovery of grassland vegetation and biomass, but also is an important way to improve grassland carbon sequestration potential.