不同管理模式对甘南高寒草甸碳储量的影响

Effects of Different Management Modes on Carbon Storage in Gannan Alpine Meadow

高寒草甸的碳汇功能对调节气候具有重要的作用,为阐明草地管理模式对其碳汇功能的影响,本文采集青藏高原东缘甘南草地不同管理样地(补播草地PG、围栏封育FE、传统放牧TG及退化草地DG)下土壤和植被样品,通过分析其物种多样性、植被碳储量和土壤碳储量等,研究不同管理模式下植被—土壤系统有机碳储量变化特征。结果表明:PG和FE地上植被碳储量显著高于DG地上植被碳储量(P<0.05),PG,TG和FE下0~10 cm层的根系碳储量显著高于10~20 cm和20~30 cm层根系碳储量(P<0.05);不同草地管理模式下土壤碳储量(0~30 cm)在1500~3900 g·m-2之间,PG下0~10 cm层和10~20 cm层土壤碳储量显著高于20~30 cm层土壤碳储量(P<0.05);从植被碳储量和土壤碳储量的角度来看,PG,FE和TG与DG相比较,生态系统碳储量分别增加52.63%,41.62%和62.53%。综上,PG,FE和TG的管理模式能够有效的改善退化草地状况,增加退化草地生态系统的碳储量。

The carbon sink function of alpine grassland plays an important role in regulating climate.In order to clarify the impact of grassland management mode on carbon sink function.In this paper,different management plots of Gannan grassland on the eastern edge of the Qinghai-Tibet Plateau(patch grassland PG,fence enclosure FE,traditional grazing TG,and degraded grassland DG)were taken as research objects.By analyzing species diversity,vegetation carbon storage and soil carbon storage,we compared the characteristics of organic carbon storage changes in vegetation-soil system under different management regimes.The results showed that:the aboveground vegetation carbon storage in PG and FE were significantly higher than that in DG(P<0.05).The root carbon storage in the 0~10 cm layer under PG,TG,and FE were significantly higher than those in the 10~20 cm and 20~30 cm layers(P<0.05).Under different grassland management modes,the carbon storage in the 0~30cm layer of the soil was between 1500~3900 g·m-2,and the carbon storage in the 0~10 cm layer and 10~20 cm layer under the PG were significantly higher than that of the 20~30 cm layer soil carbon storage(P<0.05).From the perspective of vegetation carbon storage and soil carbon storage,the carbon storage in PG,FE and EG were 52.63%,41.62%and 62.53%higher than that of DG.Therefore,the management modes of PG,FE and TG can effectively improve the degraded grassland and increase the carbon storage of the degraded grassland ecosystem.