文章摘要
何玉姣, 陈婵, 朱小叶, 陈金磊, 方晰.湘中丘陵区不同植被恢复阶段林地土壤可溶性氮组分含量和密度[J].水土保持学报,2021,35(2):258~264
湘中丘陵区不同植被恢复阶段林地土壤可溶性氮组分含量和密度
Content and Density of Soil Soluble Nitrogen Components at Different Vegetation Restoration Stages in Hilly Region of Central Hunan Province, China
投稿时间:2020-09-03  
DOI:10.13870/j.cnki.stbcxb.2021.02.034
中文关键词: 湘中丘陵区  植被恢复  可溶性有机氮  硝态氮  铵态氮
英文关键词: hilly area in the central Hunan Province  vegetation restoration  soluble organic nitrogen  ammonium nitrogen  nitrate nitrogen
基金项目:国家林业公益性行业科研专项(201504411);国家自然科学基金项目(31670448,31971455)
作者单位E-mail
何玉姣, 陈婵, 朱小叶, 陈金磊, 方晰 中南林业科技大学生命科学与技术学院, 长沙 410004 fangxizhang@sina.com 
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中文摘要:
      以湘中丘陵区的檵木-南烛-白栎灌草丛(LVR)、檵木-杉木-白栎灌木林(LCQ)、马尾松-柯-檵木针阔混交林(PLL)、柯-红淡比-青冈常绿阔叶林(LAG)作为1个恢复序列,设置固定样地,采集土壤样品,测定土壤可溶性有机氮(SON)、铵态氮(NH4+—N)、硝态氮(NO3-—N)含量及其密度,分析SON、NH4+—N、NO3-—N含量与土壤黏粒、全氮(TN)、有机碳(SOC)、微生物生物量的相关性。结果表明:各土层SON、NH4+—N含量随植被恢复而增加,与LVR相比,LAG、PLL、LCQ 0-40 cm土层SON含量分别增加225.78%,121.22%,54.73%,NH4+—N分别增加22.10%,14.74%,7.80%;而各土层NO3-—N含量随植被恢复先下降再增加,LAG各土层NO3-—N含量最高,LCQ最低;0-40 cm土壤层SON、NH4+—N密度分别为143.82~528.12,55.73~65.57 kg/hm2,与LVR相比,LAG、PLL、LCQ土壤SON密度分别增加267.20%,98.40%,86.30%,NH4+—N密度分别增加17.70%,7.90%和11.60%;0-40 cm土壤层NO3-—N密度为22.91~25.87 kg/hm2,与LVR相比,LAG增加13.16%;SON、NH4+—N密度各阶段间的增长速率呈快-慢-快的特征,而NO3-—N呈慢-慢-快的特征;土壤理化性质和微生物生物量对SON、NH4+—N的影响大于NO3-—N,表明植被恢复有利于土壤N养分积累,提高土壤可溶性氮组分的含量和密度,增加土壤N的可利用性。
英文摘要:
      We selected four adjacent plant communities with almost the same habitat conditions in Changsha County, Hunan Province, China. The four vegetation communities were composed of Loropetalum chinense-Vaccinium bracteatum-Rhododendron simsii scrub-grass-land (LVR), L. chinense-Cunninghamia lanceolata-Quercus fabri shrubbery (LCQ), Pinus massoniana-Lithocarpus glaber-L. chinense coniferous-broad leaved mixed forest (PLL), L. glaber-Cleyera japonica-Cyclobalanopsis glauca evergreen broad-leaved forest (LAG) to represent the secondary forest successional sequence in this region. Fixed sample plots were set up, and soil samples (0-40 cm) were collected and divided into four layers (0-10, 10-20, 20-30 and 30-40 cm). The contents and density of soil soluble organic nitrogen (SON), ammonium nitrogen (NH4+—N) and nitrate nitrogen (NO3-—N) were determined, and the correlations between the contents of SON, NH4+—N and NO3-—N and soil clay percentage, total nitrogen (TN), organic carbon (SOC) and microbial biomass were analyzed. The results showed that the contents of SON and NH4+—N in each soil layer increased with the vegetation restoration. Compared with LVR, contents of SON in 0-40 cm soil layers in LAG, PLL and LCQ increased respectively by 225.78%, 121.22% and 54.73%, while contents of NH4+—N increased respectively by 22.10%, 14.74%, and 7.80%. The contents of NO3-—N in each soil layer decreased first and then increased with the vegetation restoration. The NO3-—N contents in each soil layer of LAG were the highest, while LCQ was the lowest. The densities of SON and NH4+—N in the 0-40 cm soil layer were 143.82~528.12 kg/hm2 and 55.73~65.57 kg/hm2 respectively. Compared with LVR, the densities of SON in LAG, PLL and LCQ increased by 267.20%, 98.40%, and 86.30%, while NH4+—N increased by 17.70%, 7.90%, and 11.60%, respectively. The densities of NO3-—N in 0-40 cm soil layer was 22.91~25.87 kg/hm2. Compared with LVR, LAG increased by 13.16%. The growth rates of SON and NH4+—N densities between different stages showed the characteristics of fast-slowly-fast, while that of NO3-—N showed the characteristics of slow-slowly-fast. The effects of soil physicochemical properties and microbial biomass on SON and NH4+—N were greater than that of NO3-—N. In conclusion, the vegetation restoration was conducive to the accumulation of soil N, improved the contents and densities of soil soluble nitrogen components and increased soil available N.
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