模拟氮沉降对温带草原凋落物质量的影响

生态学杂志

模拟氮沉降对温带草原凋落物质量的影响

李英滨^1,3_,李琪¹,杨俊杰^1*,吕晓涛¹,梁文举¹,韩兴国^1,2#br#

(¹中国科学院沈阳应用生态研究所，沈阳 110016； ^2植被与环境变化国家重点实验室，中国科学院植物研究所，北京 100093； ^3中国科学院大学，北京 100049)

出版日期:2016-10-10 发布日期:2016-10-10

Effect of simulated nitrogen deposition on litter quality in a temperate grassland.

LI Ying-bin^1,3, LI Qi¹, YANG Jun-jie^1*, Lv Xiao-tao¹, LIANG Wen-ju¹, HAN Xing-guo^1,2#br#

(¹Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; ^2State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; ^3 University of Chinese Academy of Sciences, Beijing 100049, China).

Online:2016-10-10 Published:2016-10-10

摘要/Abstract

摘要： 基于6年模拟氮沉降试验平台研究了氮沉降对温带草原凋落物质量的影响。采集对照(0 g N·m^-2·a^-1)、低氮(5 g N·m^-2·a^-1)、中氮(10 g N·m^-2·a^-1)和高氮(15 g N·m^-2·a^-1)4个氮添加梯度，混合和单一两种凋落物类型，测定了凋落物纤维素、半纤维素、木质素、全碳、全氮和全磷含量。结果表明：长期模拟氮沉降降低了2种凋落物中纤维素、半纤维素、木质素含量及其与N素的比值；氮沉降对凋落物C含量无明显影响，降低了凋落物N、P含量以及C/N和C/P比值。由于氮沉降增加了凋落物N、P元素含量，同时降低了难分解的结构性物质含量，因此可能会对凋落物分解产生促进作用。

关键词: 黄瓜, CsRCA, 超表达, PSⅡ活性, 高温, 光合速率

Abstract: Based on a 6-year simulation N deposition experiment, we investigated the effects of N deposition on the litter quality in a temperate grassland. Mixed and monospecific litter from four N treatments, including control (0 g N·m^-2·a^-1), low nitrogen (5 g N·m^-2·a^-1), medium nitrogen (10 g N·m^-2·a^-1), and high nitrogen (15 g N·m^-2·a^-1) were collected. The basic properties of litter quality (concentrations of cellulose, hemicellulos, lignin, C, N and P) were measured. The results indicated that N deposition decreased the concentration of cellulose, hemicellulos and lignin in litter, while increased the N and P concentration. The effect of N deposition on the concentration of C was not significant. The ratios of C/N and C/P were decreased by N deposition. Our results suggest that the litter decomposition rate may be stimulated by simulated N deposition due to the increase of N and P concentration and decrease of structural carbohydrate and lignin in plant litter.

Key words: high temperature, over expression, PSⅡ activity, photosynthetic rate, cucumber., CsRCA

李英滨1,3,李琪1,杨俊杰1*,吕晓涛1,梁文举1,韩兴国1,2. 模拟氮沉降对温带草原凋落物质量的影响[J]. 生态学杂志.

LI Ying-bin1,3, LI Qi1, YANG Jun-jie1*, Lv Xiao-tao1, LIANG Wen-ju1, HAN Xing-guo1,2. Effect of simulated nitrogen deposition on litter quality in a temperate grassland.[J]. cje.

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