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当前位置: 首页 > 文章 > SO_2对中亚热带两种森林土壤氮净转化速率的短期影响 安徽农业科学 2013,41 (6) 2439-2441
Position: Home > Articles > Short-term Effect of SO_2 Fumigation on Soil Net Nitrogen Transformation Rates for Castanopsis carlesii and Cunninghamia lanceolata Forests of Northern Fujian,Mid-subtropics of China Journal of Anhui Agricultural Sciences 2013,41 (6) 2439-2441

SO_2对中亚热带两种森林土壤氮净转化速率的短期影响

作  者：
朱祥妹;李任超;陆建芳;马红亮;高人
单  位：
福建师范大学地理科学学院
关键词：
SO2;氮素转化;森林土壤;米槠林;杉木林;中亚热带
摘  要：
[目的]为了探讨硫干沉降对中亚热带地区福建省北部米槠林和杉木林2种森林土壤氮素净转化速率的短期影响。[方法]采用实验室内SO2熏蒸土壤的方法模拟硫干沉降,设置0 mg S/kg(CK)、40 mg S/kg(LS)、80 mg S/kg(HS),在30℃和60%WHC条件下培养72 h,测定土壤有关氮素转化指标。[结果]2种森林土壤经10 h SO2熏蒸处理后,HS处理显著降低土壤pH(P<0.05),并至少持续24h,但LS处理pH降低不显著,表明森林土壤对SO2酸化具有一定的缓冲能力。米槠林硫处理后前期(0～24 h)显著促进有机氮矿化(P<0.05),中后期(24～72 h)作用不明显;杉木林硫处理后前期表现出促进氮矿化的趋势,但仅HS处理的促进作用显著(P<0.05),中后期作用不显著。硫处理对2种森林土壤硝化速率的影响表现出不同的动态特点。对于米槠林,LS处理后前期(0～24 h)有显著促进硝化作用(P<0.05),中后期影响不显著,但HS处理促进作用不显著;对于杉木林,中前期影响不显著,后期硫处理才表现出显著的促进作用(P<0.05)。2种森林土壤pH与净矿化速率在前期呈现显著负相关(P<0.05),对pH相对较低(4.50)的米槠林土壤的净硝化在中前期有抑制倾向,而对pH相对较高(5.58)的杉木林土壤的净硝化在中前期有促进趋势。[结论]SO2沉降对土壤氮素转化影响可能与一般土壤致酸因子的作用机理不同。
译  名：
Short-term Effect of SO_2 Fumigation on Soil Net Nitrogen Transformation Rates for Castanopsis carlesii and Cunninghamia lanceolata Forests of Northern Fujian,Mid-subtropics of China
作  者：
ZHU Xiang-mei et al(College of Geographical Sciences,Fujian Normal University,Fuzhou,Fujian 350007)
关键词：
SO2;Nitrogen transformation;Forest soils;Castanopsis carlesii;Cunninghamia lanceolata;Mid-subtropics
摘  要：
[Objective] The impact of simulated SO2 deposition on soil nitrogen transformation rates was investigated for the two forests of Castanopsis carlesii(CAC) and Cunninghamia lanceolata(CUL) in Northern Fujian,the Mid-subtropical area of China.[Method] Soil was fumigated with three levels of SO2(0(CK),40(LS)、80(HS) mg S/kg dry soil) and incubated for 72 hours in Laboratory under the conditions of 30 ℃ of room temperature and 60% WHC of soil water content and the concerned nitrogen transformation indicators were measured.[Result] The results showed that for the two forested soils after 10 h SO2 fumigation,HS treatment significantly reduced the soil pH value(P < 0.05),and continued for at least 24 h,but the reduction of pH value for the LS treatment was not significant,indicating that the forested soils had some of the buffer capacity to SO2 acidification.The sulfur treatment significantly(P< 0.05) increased organic nitrogen mineralization in early 24 h incubation,but thereafter did not show the effect;sulfur treatment also had positive trend of soil nitrogen mineralization for CUL,but only significant for HS in the early 24 h(P < 0.05).Sulfur treatment influence on the two forested soils nitrification rates showed different dynamic characteristics.For CAS,LS significantly improved nitrification(P < 0.05) in early 24 h,but HS had no pronounced effect in the whole incubation;in contrast,for CUL forest,the influence only appeared in the late period of 48-72 h.The two forest soil presented in the early 24 h significant negative correlation between pH value and net mineralization rate,and reduced pH value had inhibition tendency to soil nitrification in the early 48 h for CAC soil with lower pH value(4.50),but for CUL soil with relatively higher pH(5.58) had positive trend to soil net nitrification.[Conclusion] The influencing mechanism of SO2 deposition to soil nitrogen transformation may be different from that of other common soil acidification factors.

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