文献类型： 外文期刊

作者： Ding, Jinmei ¹ ; Mi, Wenbao ¹ ; Wen, Qi ² ; Luo, Anmeng ² ; Hou, Kaiyuan ² ; Wu, Xinyan ² ; Xu, Hao ³ ;

作者机构： 1.Ningxia Univ, Sch Agr, Yinchuan, Peoples R China

2.Ningxia Univ, Sch Geog & Planning, Yinchuan, Peoples R China

3.Ningxia Acad Agr & Forestry Sci, Inst Desertificat Control, Yinchuan, Peoples R China

关键词： carbon sequestration; grain for green program; grazing exclosure; grasslands; Loess Plateau

期刊名称：FRONTIERS IN ENVIRONMENTAL SCIENCE （ 影响因子：5.411； 五年影响因子：6.313 ）

ISSN：

年卷期： 2022 年 10 卷

页码：

收录情况： SCI

摘要： The temperate steppe experienced degradation and desertification as a result of long-term heavy grazing and excessive reclamation. Some major ecological projects, such as the Grain for Green Program (GGP) and Grazing Exclosure (GE), have been implemented to promote ecological restoration in grassland ecosystems. With the goal of carbon neutrality, the effects of the GGP and GE on grassland carbon sequestration need to be further explored. Based on soil data from the second soil survey in the 1980s, a field survey in 2021, and the land-use/land-cover datasets of 2000-2018, we characterized the changes in soil C stock following grazing exclosure, analyzed the effect of GGP on land-use changes and soil C accumulation, and then estimated the overall grassland carbon sequestration in Ningxia on the Loess Plateau of China. From 2000 to 2018, GE increased the grassland SOCD from 49.60 Mg ha(-1) to 90.71 Mg ha(-1), and the C stock increased by 65.55 T g. Under the influence of the GGP, 347.62 km(2) of cultivated land was converted into grasslands, increasing the grassland soil carbon sequestration by 1.31 T g. Subsequently, the grassland organic carbon storage increased by 66.86 T g, which accounted for approximately 4.26% of the grassland organic carbon storage in the Loess Plateau of China. In the southern Loess hilly area, which experienced high precipitation and low temperatures, grasslands increased by 95.55 km(2); the average organic carbon density increased 46.95 Mg ha(-1) due to a rate of increase of 2.61 Mg ha(-1) yr(-1); and the corresponding values for those in the middle arid zone were 36.25 Mg ha(-1) and 2.01 Mg ha(-1) yr(-1), with grasslands decreasing by 147.41 km(2). The follow-up policies of the GGP and GE should be implemented and improved according to local conditions to improve the carbon sink and ecological services in grassland ecosystems.