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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. (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-bin1,3, LI Qi1, YANG Jun-jie1*, Lv Xiao-tao1, LIANG Wen-ju1, HAN Xing-guo1,2#br#   

  1. (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: 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