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密度调控对女贞人工林土壤N2O排放的影响
卢雯,丁辉,邱雷,关庆伟
0
(南京林业大学森林资源与环境学院,南京 210037)
摘要:
以江苏省扬州市江都区女贞人工林为对象,研究了密度调控对其土壤N2O排放通量的影响。结果表明,3种密度下土壤N2O排放通量均是秋季和春季较高,冬季最低。秋季时,3种密度下N2O排放通量大小比较为4225株·hm-2(9.985 μg m-2·h-1)>1050株·hm-2(8.195 μg·m-2·h-1)>2275株·hm-2(6.971 μg·m-2·h-1),但各密度间差异不显著(P>0.05)。冬季时,N2O排放通量下降明显,其中4225株·hm-2密度(-10.355 μg·m-2·h-1)和2275株·hm-2密度(-2.716 μg·m-2·h-1)均为负值,且两者明显低于1050株·hm-2密度下N2O排放通量(2.629 μg·m-2·h-1)。春季伴随着温度的回升,各密度下N2O排放通量均显著增加,并达到4个季度中的最高值, 其中2275株·hm-2密度下排放通量最低(7.513 μg·m-2·h-1), 且与4225株·hm-2(11.839 μg·m-2·h-1)和1050株·hm-2(12.175 μg·m-2·h-1)密度间差异达到极显著水平(P<0.01)。夏季时, 3种密度下N2O排放通量分别为4225株·hm-2(3.201 μg·m-2·h-1),2275株·hm-2(7.658 μg·m-2·h-1)和1050株·hm-2(6.804 μg·m-2·h-1),各密度间差异并不显著(P>0.05)。土壤N2O排放通量与土温呈极显著正相关(P<0.01),与NH4+-N和NO3--N含量间则呈极显著负相关(P<0.01)。土壤氮矿化速率与N2O排放通量也呈线性相关极显著(P<0.01),说明密度调控作用于土壤因子,并对N2O排放产生明显影响。
关键词:  密度调控  女贞人工林  N2O排放  土壤因子
DOI:10.13610/j.cnki.1672-352x.20141029.022
投稿时间:2014-03-25
基金项目:“十二五”国家科技支撑项目(2011BAD38B03-2)和江苏高校优势学科建设工程项目(PAPD)共同资助。。
Effect of density-dependent regulation on N2O emission in Ligustrum lucidum plantation
LU Wen,DING Hui,QIU Lei,GUAN Qingwei
(College of Forest Resource and Environment, Nanjing Forestry University, Nanjing 210037)
Abstract:
The effect of density-dependent regulation on soil N2O flux in Ligustrum lucidum plantation in Jiangdu district of Yangzhou was studied. The results showed that the fluxes under the three densities had high values in autumn and spring and low values in winter. In autumn, the average of N2O flux showed: 4225 tree/hm2 (9.985 μg·m-2·h-1)>1050 tree/hm2(8.195 μg·m-2·h-1)>2275 tree/hm2 (6.971 μg·m-2·h-1). In winter, the N2O flux significantly decreased in which both 4225 tree/hm2 (-10.355 μg·m-2·h-1) and 2275 tree/hm2 (-2.716 μg·m-2·h-1) were significantly lower than 1050 tree/hm2 (2.629 μg·m-2·h-1). The N2O flux in the plot with a density of 2275 tree/hm2 (7.513 μg·m-2·h-1) was lower than that in other two plots and the difference was highly significant (P<0.01). In summer, the N2O fluxes in three plantation densities were as follows: 4225 tree/hm2, 3.201μg·m-2·h-1; 2275 tree/hm2, 7.658 μg·m-2·h-1; and 1050 tree/hm2, 6.804 μg·m-2·h-1. The N2O flux had a significant positive relationship with soil temperature (P<0.01), while it had an extremely negative correlation with NH4+-N and NO3--N content (P<0.01). A highly significant correlation between N2O flux and soil nitrogen mineralization (P<0.01) was also observed. It is suggested that density-dependent regulation would affect soil factors and have significant influence on N2O emission.
Key words:  density-dependent regulation  Ligustrum lucidum plantation  N2O emission  soil factors

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