松嫩草原优势植物羊草和芦苇凋落物的分解对模拟增温及氮沉降的响应  

Decomposition of Leymus chinensis and Phragmites communis litter responses to simulated warming and nitrogen application in Songnen grassland

作　　者：齐红[1,2] 刘洋[2] 郭继勋[2] 

机构地区：[1]长春教育学院生物系,吉林长春130061 [2]东北师范大学草地科学研究所,吉林长春130024

出　　处：《东北师大学报（自然科学版）》2012年第4期114-119,共6页Journal of Northeast Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(31170303)

摘　　要：以松嫩草原优势植物羊草和芦苇凋落物为研究对象,利用红外线加热器模拟大气升温,人工施氮肥模拟氮沉降,探讨了羊草、芦苇凋落物的分解对增温和施氮的响应.结果表明:增温和施氮不同程度地加快了两种凋落物的分解.羊草凋落物的残留率从小到大依次为:增温+施氮处理(69.3%),施氮处理(75.75%),增温处理(81.2%),对照(83.8%);芦苇凋落物残留率为:增温+施氮处理(78.85%),施氮处理(83.25%),对照(85.60%),增温处理(86.50%).通过Olson模型预测,增温和施氮处理将缩短羊草和芦苇凋落物的分解周期.对凋落物中细菌、真菌、放线菌的生物量与分解量进行的多元回归分析表现,细菌生物量偏回归系数最大,是影响两种凋落物分解的主要分解者.在整个分解过程中,凋落物有机碳含量与分解量具有显著的相关性.This thesis focused on Leymus chinensis and Phragmites communis litter in Songnen grassland.Infrared heater was used to increase the temperature.The simulation of nitrogen deposition was made by applying fertilizer.The responses of litter decomposition to warming and nitrogen application was examined.The result showed that warming and nitrogen application both significant increased litter decomposition rates in a certain extent.The order of decomposition residual rate of L.chinensis were warming＋nitrogen application（69.30%）,nitrogen application（75.75%）,warming（81.20%）,control（83.80%）;The order of decomposition residual rate of P.communis were warming＋nitrogen（78.85%）,nitrogen application（83.25%）,control（85.60%）,warming（86.50%）.Warming and nitrogen application treatments shortened the decomposition periods of L.chinensis and P.communis litter by Olson model.The linear regression showed that the regression coefficient of bacteria was the max among four treatments of two species;can explain that bacterial biomass was the most important factor during litter decomposition.In the course of litter decomposition,the relatedness of litter decomposition quality with organic C content was positively positive correlation.The content of total nitrogen and total phosphorus in litter have existed settling phenomena.

关 键 词：增温 氮沉降 羊草 芦苇 凋落物分解 

分 类 号：S812[农业科学—草业科学]