1.College of Desert Control Science and Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China
2.Key Laboratory of National Forestry and Grassland Administration on Protection;and Recovery of Desert Ecosystem,Inner Mongolia Agricultural University,Hohhot 010018,China
3.Pastoral Water Conservancy Science Research Institute of Ministry of Water Resources,Hohhot 010020,China
Objective To explore the carbon density and its distribution pattern of the soil and water conservation forests on the Ordos Plateau, thereby providing a basis for carbon sink management and scientific planning in this area. Methods The soil and water conservation forests consisting of Prunus sibirica forest, Pinus tabulaeformis forest, and Prunus sibirica-Pinus tabulaeformis mixed forest in Ordos City were selected as the research objects. Through the combination of field investigation and experiment, the carbon density distribution characteristics and influencing factors of different soil and water conservation forest ecosystems were comprehensively explored. Results (1) The ecosystem carbon densities ranked as follows: Prunus sibirica forests (60.99 t/hm²) > Pinus tabulaeformis forests (47.09 t/hm²) > Prunus sibirica-Pinus tabulaeformis mixed forests (44.30 t/hm²) > abandoned land (27.43 t/hm²). Compared to abandoned land, carbon densities of planted forests increased by 122.33%, 71.64%, and 61.47%, respectively (p<0.05). (2) The carbon densities of the components of the three types of soil and water conservation forest ecosystems were in the following order: soil layer > tree layer > litter layer > herbaceous layer. The proportion of carbon density in the soil layer was the highest, accounting for 92.64% to 94.59% of the ecosystem carbon density. (3) The carbon densities of the components of the tree layer in the three types of soil and water conservation forests were in the following order: trunk > root > branch > leaf. Among them, the trunk and root accounted for 40.41% to 60.61% and 26.04% to 37.74% of the entire tree layer, respectively. (4) Correlation analysis revealed that the carbon densities of the ecosystem, tree layer, herbaceous layer, and soil layer were all highly significantly positively correlated with soil water content (SWC) and ammonium nitrogen (AN) (p<0.01), and significantly negatively correlated with pH and nitrate nitrogen (NN) (p<0.05). (5) Redundancy analysis showed that ammonium nitrogen (AN), nitrate nitrogen (NN), total nitrogen (TN), available phosphorus (AP), and available potassium (AK) were the key factors influencing the carbon density of soil and water conservation forests. Conclusion In establishing soil and water conservation forests, selecting Prunus sibirica is more conducive to the sequestration and accumulation of organic carbon in the ecosystem. Additionally, nitrogen fertilizer needs to be applied to the soil and water conservation forests during the afforestation process.
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