Soil organic carbon and total nitrogen as affected by vegetation types in Northern Loess Plateau of China
Soil organic carbon and total nitrogen as affected by vegetation types in Northern Loess Plateau of China
复制标题
北方黄土高原植被类型对土壤有机碳和全氮的影响
DOI：
10.1016/j.geoderma.2009.11.020
复制
发表时间：
2010-02-15
期刊：
影响因子：
6.1
通讯作者：
Horton, Robert
中科院分区：
文献类型：
--
作者：
Fu, Xiaoli;Shao, Mingan;Horton, Robert
黄土高原是我国黄土高原最脆弱的地区之一，是风蚀、水蚀的过渡带。过渡带约占黄土高原面积的30%。为了减少黄土高原的土壤退化，中国政府于1999年启动了国家资助的植被恢复项目。该项目对过渡带土壤的有效性尚不清楚。研究目的是确定过渡带内4种主要植被类型对土壤有机碳和氮的影响。Korshinsk Peashrub（KOP）、紫色苜蓿（ALF）。和自然休闲地被选为植被恢复类型，因为它们已被广泛用于修复土壤退化。选择的第四种植被类型是小米，因为它是该地区的重要作物。2004年，在12度斜坡土地上建立了四个61 x 5米的地块。图是平行的，间隔80 cm。根据2007年8月采集的土壤样品，有很大的差异，在分布和库存的SOC和N在4种植被类型。与MIL相比，KOP显著增加了0-100 cm土壤剖面SOC和全氮（TN）的浓度和储量，而ALF和NAF差异不显著。土壤有机碳和总氮含量以及KOP、ALF和NAF的蓄积量沿坡面沿着分布较为均匀，而MIL的土壤有机碳和总氮含量沿坡面呈沿着增加趋势。植被类型和坡位对碳氮比的影响不显著。我们的研究表明，通过良好的植被恢复措施，可以改善过渡带的SOC和TN储量。(C)2009年由Elsevier B. V.出版
One of the most fragile areas in the China Loess Plateau, is the transitional belt that is subjected to wind and water erosion. The transitional belt accounts for about 30% of the Loess Plateau area. To reduce soil degradation in the Loess Plateau, the Chinese government initiated a state-funded vegetation restoration project in 1999. The effectiveness of this project on transitional belt soils is unknown. The objective of this study is to determine the effects of four dominant vegetation types on soil organic carbon (SOC) and nitrogen (N) in a selected catchment within the transitional belt. Korshinsk Peashrub (KOP), purple alfalfa (ALF). and natural fallow (NAF) were selected as vegetation restoration types because they have been used widely to remedy soil degradation. The fourth vegetation type selected was millet (MIL) because it has been an important crop in the region. In 2004, four 61 x 5 m plots were established on 12 degrees slope land. The plots were parallel and separated by 80 cm. Based upon soil samples collected in August of 2007, there were large variations in the distributions and stocks of SOC and N across the four vegetation types. Compared with MIL, KOP significantly increased the concentration and stock of SOC and total nitrogen (TN) in 0-100 cm soil profiles, while ALF and NAF were not significantly different. The distributions of SOC and TIN concentrations and stocks of KOP, ALF and NAF were relatively uniform along a hillslope, while there was an increasing trend along the hillslope in MIL This result suggests that ALF and NAF would be beneficial in SOC and TN sequestration over a long-term because of their ability to reduce the loss of SOC and TN by soil erosion. We also found that both vegetation types and hillslope position had no significant effects on C:N ratio. Our Study demonstrated that improvements of SOC and TN stocks in the transitional belt could be made through well managed vegetation restoration measures. (C) 2009 Published by Elsevier B.V.