不同恢复措施对宁夏典型草原土壤碳氮储量的影响

发布时间：2018-05-15 18:05

本文选题：恢复措施 + 典型草原　；参考：《草业学报》2017年12期

【摘要】：为探讨不同恢复措施下草原土壤有机碳、全氮储量特征的变化,以宁夏黄土丘陵区典型草原为对象,对放牧(对照GG),封育(EG),水平沟(CG)和鱼鳞坑(FG)3种不同恢复措施下0~40 cm土壤有机碳、全氮储量进行研究。研究表明:1)土壤有机碳和全氮含量以封育草地最高,分别为30.35和2.92 g/kg,放牧草地次之,水平沟草地最低(P0.05);C/N表现为封育最高,水平沟次之,放牧草地最低;各措施下土壤有机碳和全氮含量随着土层加深整体呈下降趋势。2)土壤有机碳和全氮密度呈封育和放牧草地较高,鱼鳞坑居中,水平沟最低。各恢复措施下有机碳密度随着土层加深而降低,全氮密度无明显规律。3)土壤碳氮储量表现为封育草地放牧草地鱼鳞坑草地水平沟草地。禁牧封育更有利于该区典型草原土壤有机碳和全氮储量的积累。
[Abstract]:In order to study the change of soil organic carbon and total nitrogen storage characteristics under different restoration measures, the typical grassland in Ningxia Loess Hilly region was taken as an object. The soil organic carbon and total nitrogen storage in 0 ~ 40 cm soil were studied under three different restoration measures: grazing (control GGN, fencing, GG) and FGG (FGN). The results showed that the soil organic carbon and total nitrogen contents were the highest in fenced grassland, 30.35 and 2.92 g / kg, respectively, followed by grazing grassland, and the lowest P 0.05 C / N in horizontal ditch grassland was the highest, the horizontal ditch was the second, and the grazing grassland was the lowest. Soil organic carbon and total nitrogen content decreased with the deepening of soil layer. 2) soil organic carbon and total nitrogen density were higher in herding and grazing grassland, middle in fishscale pit and lowest in horizontal ditch. The organic carbon density decreased with the deepening of soil layer, but the total nitrogen density was not obvious. 3) the storage of soil carbon and nitrogen was shown as the horizontal ditch grassland of fenced grassland. Forbidding grazing and fencing is beneficial to the accumulation of soil organic carbon and total nitrogen in typical steppe in this area.
【作者单位】：宁夏大学农学院;宁夏大学西北土地退化与生态恢复省部共建国家重点实验室培育基地;
【基金】：国家自然科学基金项目(31460632,31360582) 中国科学院“西部之光”人才培养引进计划项目(XAB2015A10)资助
【分类号】：S812.2

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