模拟酸雨对大兴安岭3个树种凋落叶分解速率和溶解有机碳的影响

发布时间：2018-09-10 15:19

【摘要】：利用室内分解袋法研究模拟酸雨对大兴安岭根河地区白桦Betula platyphylla,杜香Ledum palustre,兴安杜鹃Rhododendron dauricum凋落叶分解速率及分解释放溶解有机碳的影响,分别设置pH3.5,5.0和7.0三个梯度。结果表明,分解过程中3个树种凋落叶在pH 3.5的质量损失最少,其次是pH 5.0和7.0;不同树种对酸雨胁迫的影响具有一定的差异;3个树种凋落叶的失重率为:杜香白桦兴安杜鹃;3个树种凋落叶的失重率和分解速率均与凋落叶初始C浓度、木质素浓度、C/N比和木质素/N呈显著负相关,与N,P和纤维素浓度呈显著正相关;3个树种凋落叶分解释放溶解有机碳都是先增加后减少,后趋于动态平衡减少状态。
[Abstract]:The effects of simulated acid rain on the decomposition rate and release of dissolved organic carbon (dissolved organic carbon) in leaves of Bai Hua Betula platyphylla, Duxiang Ledum palustre, Ledum palustre, were studied by using the method of indoor decomposition bag. The pH3.5,5.0 and 7.0 gradients were set up respectively. The results showed that the weight loss of litter leaves of three tree species in pH 3.5 was the least in the process of decomposition. The weight loss rate of three tree species was: Bai Hua Xingan Rhododendron, the weight loss rate and decomposition rate of three tree species were all with the initial C concentration of litter leaves, the weight loss rate and decomposition rate of three tree species were different from those of different tree species on acid rain stress, the weight loss rate of three tree species was: Bai Hua Xingan Rhododendron. The C / N ratio of lignin and lignin / N were negatively correlated with N / N, and positively correlated with N P and cellulose concentration, and the dissolved organic carbon released from litter of three tree species increased at first, then decreased, then tended to decrease in dynamic equilibrium.
【作者单位】：内蒙古农业大学沙漠治理学院;内蒙古自治区水利科学研究院;内蒙古自治区大兴安岭林管局营林处;
【基金】：国家自然科学基金项目(No.41461106) 内蒙古农业大学引进人才科研启动项目(No.YJ2014-1)
【分类号】：S714

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