模拟氮沉降对温带草原凋落物质量的影响  

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

作　　者：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] LI Ying- bin LI Qi YANG Jun-jie LU Xiao-tao LIANG Wen-ju HAN Xing-guo(Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China University of Chinese Academy of Sciences, Beijing 100049, China）.)

机构地区：[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　　处：《生态学杂志》2016年第10期2732-2737,共6页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(3143000565、31570519和31400370)资助

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(15g 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。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 basic 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 deposition 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.

关 键 词：氮沉降 温带草原 凋落物质量 凋落物分解 

分 类 号：S812[农业科学—草业科学]