臭氧摩尔分数升高对不同树龄银杏凋落叶分解和养分变化的影响  

Effect of Elevated Ozone Concentration on Decomposition and Nutrients Release of Ginkgo biloba Leaf Litter with Different Ages

作　　者：付伟 苏丽丽 王楠[3] 何兴元[4] 徐胜 Fu Wei;Su Lili;Wang Nan;He Xingyuan;Xu Sheng(Yichun University,Yichun 336000,P.R.China;Shenyang Institute of Technology;Institute of Applied Ecology,Chinese Academy of Sciences;(Key Laboratory of Forest Ecology and Management,Chinese Academy of Sciences),Institute of Applied Ecology,Chinese Academy of Sciences)

机构地区：[1]宜春学院,宜春336000 [2]沈阳工学院 [3]中国科学院沈阳应用生态研究所 [4]中国科学院森林生态与管理重点实验室(中国科学院沈阳应用生态研究所)

出　　处：《东北林业大学学报》2021年第10期34-41,共8页Journal of Northeast Forestry University

基　　金：宜春学院博士科研启动经费项目(3360118010);宜春学院地方本科高校特色校本课程开发研究(3310951904);国家自然科学基金项目(32071597、31870458、31270518)。

摘　　要：利用开顶箱(OTCs)模拟,采用尼龙网袋法开展了背景大气对照和臭氧摩尔分数升高(约80 nmol·mol^(-1))下对沈阳城市森林10年生和30年生银杏(Ginkgo biloba)凋落叶前期分解影响的研究。结果表明:与10年生银杏相比,30年生银杏凋落叶初始N、P、可溶性糖、总酚、缩合单宁质量分数显著更低(P<0.05)。与对照相比,分解结束时(150 d),O_(3)摩尔分数升高促进了10年生和30年生银杏凋落叶的分解速率,干质量残留率分别降低3.91%和4.52%(P<0.05)。在O_(3)处理下,2种树龄银杏凋落叶的C、木质素、总酚剩余率在分解结束时更低(P<0.05),能较好的解释分解速率的变化趋势。在相同处理下,30年生银杏凋落叶分解速率较10年生更快,主要与凋落物基质质量有关。O_(3)摩尔分数升高对不同树龄银杏凋落叶分解过程中养分循环产生一定影响,且随着树龄增加,银杏凋落叶分解速率加快。By taking the nylon mesh bags method,10-and 30-a Ginkgo biloba leaf litters were exposed to control and elevated ozone(about 80 nmol·mol^(-1))concentration in open-top chambers(OTCs)in Shenyang.The effect of elevated O_(3) on leaf litter decomposition and nutrients of G.biloba were measured.The contents of N,P,soluble sugar,total phenols and condensed tannins in 30-a leaf litter of condensed tannins in 30-a leaf litter of G.biloba were lower than those of 10-a(P<0.05).Compared with control,the decomposition rate of 10-and 30-a leaf litter under elevated ozone concentration increased at the end of this experiment(150 d),remaining mass to initial were significantly decreased by 3.91%and 4.52%(P<0.05),respectively.The remaining mass of C,lignin and total phenols of G.biloba leaf litter with different ages were lower at the end of decomposition under elevated O_(3)(P<0.05),which could explain the variation trend of decomposition rate.Under the same treatment,the decomposition rate of 30-a G.biloba leaf litter was faster than that of 10 a,which was mainly related to the mass of litter substrate.The results showed that the increase of O_(3) concentration had a certain effect on nutrient cycling of different ages of G.biloba leaf litter during decomposition,and the decay rate of leaf litter was accelerated with the increase of tree ages.

关 键 词：凋落叶分解 臭氧 银杏 养分动态 树龄 

分 类 号：Q142[生物学—生态学]