Impact of land-use on carbon storage as dependent on soil texture: Evidence from a desertified dryland using repeated paired sampling design

Xuehua Ye, Shuangli Tang, William K. Cornwell, Shuqin Gao, Zhenying Huanga, Ming Dong, Johannes H.C. Cornelissen


不同土壤基质下土地利用方式对碳储存的影响
土地不合理利用导致的荒漠化会极大的降低干旱区的碳储量。然而,在研究土地利用方式对碳库的研究中,很难排除其它因素的影响,如大气、地貌、土壤基质和其它土壤特性等。为避免这些因素的干扰,本研究以鄂尔多斯高原沙基质上的沙地草地和壤土基质上的荒漠草原为研究对象,分别选择了5组两两相邻的不同的土地利用方式对,通过系统地取样分析,研究鄂尔多斯高原不同土壤基质条件下不同的土地利用方式对碳储量的影响,以期找到该区域内最有利于碳库维持的土地利用方式。结果表明:1)沙漠化防治能够极大的提高沙地草地的碳储量,种植灌木比种植草本更有利于增加沙地草地的碳储量;2)发展人工草地能够较好的解决荒漠草原的生态与经济矛盾;3)沙地草地比荒漠草原更容易发生土地退化。这些研究结果将有助于干旱区荒漠化防治过程中土地利用方式的选择。进一步的研究应关注于土壤基质在土地利用方式的改变对碳储量动态影响中的作用。

Abstract
Desertification resulting from land-use affects large dryland areas around the world, accompanied by carbon loss. However it has been difficult to interpret different land-use contributions to carbon pools owing to confounding factors related to climate, topography, soil texture and other original soil properties. To avoid such confounding effects, a unique systematic and extensive repeated design of paired sampling plots of different land-use types was adopted on Ordos Plateau, N China. The sampling enabled to quantify the effects of the predominant land-use types on carbon storage as dependent on soil texture, and to define the most promising land-use choices for carbon storage, both in grassland on sandy soil and in desert grassland on brown calcareous soil. The results showed that (1) desertification control should be an effective measure to improve the carbon sequestration in sandy grassland, and shrub planting should be better than grass planting; (2) development of man-made grassland should be a good choice to solve the contradictions of ecology and economy in desert grassland; (3) grassland on sandy soil is more vulnerable to soil degradation than desert grassland on brown calcareous soil. The results may be useful for the selection of land-use types, aiming at desertification prevention in drylands. Follow-up studies should directly investigate the role of soil texture on the carbon storage dynamic caused by land-use change.
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