Content and Density of Soil Soluble Nitrogen Components at Different Vegetation Restoration Stages in Hilly Region of Central Hunan Province, China

HE Yujiao; CHEN Chan; ZHU Xiaoye; CHEN Jinlei; FANG Xi

doi:10.13870/j.cnki.stbcxb.2021.02.034

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Content and Density of Soil Soluble Nitrogen Components at Different Vegetation Restoration Stages in Hilly Region of Central Hunan Province, China

更新时间：2025-03-12

- Content and Density of Soil Soluble Nitrogen Components at Different Vegetation Restoration Stages in Hilly Region of Central Hunan Province, China
- Vol. 35, Issue 2, Pages: 258-264(2021)
- 作者机构：
  
  中南林业科技大学生命科学与技术学院,长沙,410004
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2021.02.034
  CLC： S153.6
- Published：2021
- 稿件说明：
移动端阅览
HE Yujiao, CHEN Chan, ZHU Xiaoye, et al. Content and Density of Soil Soluble Nitrogen Components at Different Vegetation Restoration Stages in Hilly Region of Central Hunan Province, China[J]. 2021, 35(2): 258-264.
DOI：

HE Yujiao, CHEN Chan, ZHU Xiaoye, et al. Content and Density of Soil Soluble Nitrogen Components at Different Vegetation Restoration Stages in Hilly Region of Central Hunan Province, China[J]. 2021, 35(2): 258-264. DOI： 10.13870/j.cnki.stbcxb.2021.02.034.

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。

Abstract

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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