模拟酸雨对次生林土壤呼吸及异养呼吸的影响

发布时间：2018-01-23 08:56

本文关键词： 模拟酸雨次生林土壤呼吸异养呼吸土壤温度　出处：《环境科学》2017年03期 　论文类型：期刊论文

【摘要】：为研究模拟酸雨对次生林土壤呼吸及异养呼吸的影响,进行野外定位试验.设置裂区试验,分4个区组,每个区组中主区为不断根和挖沟断根小区,每个主区内设置对照(CK)、pH 4.0(A1)、pH 3.0(A2)、pH 2.0(A3)共4个模拟酸雨处理水平.观测不断根小区的土壤呼吸和断根小区的异养呼吸,同时观测土壤温度、土壤湿度.结果表明,在不断根小区,CK、A1、A2、A3处理的土壤呼吸均表现出明显的季节变异趋势;与不断根小区类似,断根小区的异养呼吸也具有明显的季节变异趋势.断根小区的异养呼吸明显低于不断根小区的土壤呼吸.CK、A1、A2、A3处理的年平均土壤呼吸速率分别为(2.47±0.31)、(2.52±0.22)、(2.38±0.17)、(2.43±0.22)μmol·(m~2·s)~(-1);断根小区CK、A1、A2、A3处理的年平均异养呼吸速率分别为(1.55±0.10)、(1.65±0.22)、(1.77±0.08)、(1.78±0.27)μmol·(m~2·s)~(-1).单因素方差分析表明,不断根小区不同模拟酸雨处理之间的土壤呼吸速率以及断根小区不同模拟酸雨处理的异养呼吸速率均无显著差异.回归分析表明,不断根小区的土壤呼吸与断根小区的异养呼吸之间存在极显著(P0.001)的正比例函数关系,模拟酸雨的添加降低了土壤呼吸与异养呼吸之比.土壤温度是决定不断根小区土壤呼吸和断根小区异养呼吸季节变异的最主要的因素,而土壤湿度对土壤呼吸和异养呼吸的季节变异无显著的影响.
[Abstract]:In order to study the effect of simulated acid rain on soil respiration and heterotrophic respiration in secondary forest, field location test was carried out. In each main area, the control group (pH 4.0 ~ A1) and pH 3.0 ~ (A2) were set. Soil respiration and heterotrophic respiration, soil temperature and soil moisture were observed in 4 simulated acid rain treatments. The soil respiration of CK A _ (1) A _ (1) A _ (2) A _ (2) A _ (3) treatment showed a significant seasonal variation trend in the uninterrupted root plot. The heterotrophic respiration in the root breakage area was significantly lower than that in the continuous root area, and the heterotrophic respiration in the root breakage area was significantly lower than that in the continuous root area. The annual average soil respiration rates of A3 treatment were 2.47 卤0.31, 2.52 卤0.22, 2.38 卤0.17, respectively. 2. 43 卤0. 22 渭 mol. 2. The annual average rate of heterotrophic respiration in the root cut area was 1.55 卤0.10 and 1.65 卤0.22, respectively, and the average annual rate of heterotrophic respiration was 1.77 卤0.08 in the treatment of CKA _ (1) A _ (1) A _ (2) A _ (2) A _ (3). 1. 78 卤0. 27) 渭 mol 路m ~ (2) 路s ~ (-1). Univariate analysis of variance showed. There was no significant difference in soil respiration rate between different simulated acid rain treatments in continuous root plot and heterotrophic respiration rate in different simulated acid rain treatments in root breaking plot. Regression analysis showed that there was no significant difference in soil respiration rate between different simulated acid rain treatments. The relationship between soil respiration and heterotrophic respiration was significant (P0.001). The addition of simulated acid rain reduced the ratio of soil respiration to heterotrophic respiration. Soil temperature was the most important factor to determine the seasonal variation of soil respiration and heterotrophic respiration. But soil moisture had no significant effect on seasonal variation of soil respiration and heterotrophic respiration.
【作者单位】：南京信息工程大学江苏省大气环境与装备技术协同创新中心;南京信息工程大学应用气象学院;
【基金】：国家自然科学基金项目(41375006) 江苏省“青蓝工程”项目(2014) 江苏省“六大人才高峰”项目(2015-NY-012)
【分类号】：S714;X517
【正文快照】： 由温室气体造成的温室效应是全球性的环境问题之一,CO2是最主要的温室气体.温室效应的最直接结果是全球变暖,全球变暖对生态系统会产生一系列的不良影响.酸雨是另一个全球性的环境问题,我国是受酸雨污染较为严重的国家,特别是南方地区,酸雨问题更为严重[1~3].酸雨对生态系统会

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