模拟氮沉降下不同凋落物处理对太岳山华北落叶松林土壤呼吸的影响

发布时间：2018-06-07 23:18

本文选题：模拟氮沉降 + 凋落物处理　；参考：《中南林业科技大学学报》2017年04期

【摘要】：土壤呼吸是全球碳循环的重要组成部分,氮沉降会影响土壤中碳储量变化。为阐明模拟氮沉降和不同凋落物处理对土壤呼吸速率的影响,本研究在山西太岳山好地方林场进行氮沉降模拟试验,并对林地表面进行对照(C)、去凋(B)、去根去调(A)处理。结果表明:土壤呼吸速率的季节变化主要受土壤温度和含水量影响,氮沉降并没有改变土壤呼吸速率的季节变化规律。整个观测期内,模拟氮沉降促进了不同凋落物处理下土壤呼吸速率,且均在高氮水平下达到显著(P0.05);高氮促进生长季凋落物层的呼吸;去凋和去根去凋处理抑制了土壤呼吸速率,且低氮和中氮水平降低了抑制土壤呼吸的幅度。土壤温度敏感性随着氮水平的增加而增加。土壤呼吸速率与土壤湿度拟合关系不显著(P0.05),而与土壤温度的拟合关系极显著(P0.001)。相比于单因子模型,土壤温度与水分双因子复合模型(RS=aeb TWc)能更好地解释土壤呼吸季节变化。
[Abstract]:Soil respiration is an important part of the global carbon cycle, and nitrogen deposition affects the change of soil carbon storage. In order to elucidate the effects of simulated nitrogen deposition and different litter treatments on soil respiration rate, a simulated experiment of nitrogen deposition was carried out in Shanxi Taiyue Mountain Forest Farm. The results showed that the seasonal variation of soil respiration rate was mainly affected by soil temperature and water content, but nitrogen deposition did not change the seasonal variation of soil respiration rate. During the whole observation period, simulated nitrogen deposition promoted soil respiration rate under different litter treatments, and reached significant P0.05 at high nitrogen level; high nitrogen promoted litter layer respiration in growing season; removal and root removal inhibited soil respiration rate. Low and moderate nitrogen levels reduced the inhibition of soil respiration. Soil temperature sensitivity increased with the increase of nitrogen level. The fitting relationship between soil respiration rate and soil moisture was not significant (P0.05), but the fitting relationship with soil temperature was very significant (P0.001). Compared with the single factor model, the soil temperature and moisture two-factor model can better explain the seasonal variation of soil respiration.
【作者单位】：北京林业大学省部共建森林培育与保护教育部重点实验室;
【基金】：林业公益性行业科研专项(201404213)
【分类号】：S714

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