The effects of ecological construction and topography on soil organic carbon and total nitrogen in the Loess Plateau of China
The effects of ecological construction and topography on soil organic carbon and total nitrogen in the Loess Plateau of China
复制标题
黄土高原生态建设和地形对土壤有机碳和全氮的影响
DOI：
10.1007/s12665-018-7992-3
复制
发表时间：
2019
影响因子：
2.8
通讯作者：
Yang Wengang
中科院分区：
文献类型：
--
作者：
Shi Peng;Duan Jinxiao;Zhang Yan;Li Peng;Wang Xiukang;Li Zhanbin;Xiao Lie;Xu Guoce;Lu Kexin;Cheng Shengdong;Ren Zongping;Zhang Yi;Yang Wengang
梯田建设和坡面植被恢复是黄土高原水土保持的主要措施，其对土壤有机碳（SOC）和全氮（TN）的分布格局有重要影响。地形影响土壤侵蚀，改变土壤有机碳和有机质含量。然而，有关生态建设和地形对SOC和CO2的影响的资料很少。以黄土高原地区人工林、草地、梯田和坡耕地4种土地利用方式为研究对象，研究了不同土地利用方式和地形因子对坡上、坡中、坡脚3个部位表层土壤有机碳和速效钾含量的影响。结果表明，坡耕地转变为人工林和草地后，土壤有机碳和有机质含量均有所提高。坡位是决定人工林、草地和坡耕地土壤有机碳和有机质在坡面尺度上分布的重要地形因子，坡脚土壤有机碳和有机质含量最高，坡上部次之，坡中部最低。土壤有机碳和土壤有机碳含量与~（137）Cs含量呈正相关。土地利用类型、坡位、土壤侵蚀量与土壤侵蚀分异率和土壤侵蚀分异率有显著的相关性。结果表明，黄土丘陵区坡耕地植被恢复有利于土壤碳、氮的固定。定量估算土地利用变化和地形对土壤有机碳和可持续利用的影响，可以提高复杂地形地区土壤有机碳和可持续利用预测的精度。
The construction of terraces and vegetation restoration in the hillslope are major soil and water conservation measures on the Chinese Loess Plateau and contributed to the distribution patterns of soil organic carbon (SOC) and soil total nitrogen (STN). Topography influences soil erosion and changes SOC and STN contents. However, little information is available regarding the effects of ecological construction and topography on SOC and STN. A study was undertaken in the Loess Plateau, to evaluate the effects of land use conversion and topographic factors on the topsoil SOC and STN content at three hillslope positions (upper, middle, and foot slopes) under four land uses types: artificial forest, grassland, terraced fields, and sloping cropland. The results showed that land use conversion from sloping cropland to artificial forest and grassland improved the SOC and STN content. Slope position was an important topographic factor governing the SOC and STN distribution at the slope scale in artificial forest, grassland, and sloping cropland, with the foot slope having the highest SOC and STN content, followed by the upper slope, while the middle slope had the lowest values. SOC and STN showed positive correlation with Caesium-137 (137Cs) content. Land use types, slope position, and soil erosion had significant relationships with SON and STN. The results suggested that vegetation restoration of sloping cropland will contribute to soil carbon (C) and nitrogen (N) sequestration in the loess hilly region. The quantitative estimation of land use change and topography effects on SOC and STN could improve the accuracy of SOC and STN predictions in the region with a complex topography.