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当前位置: 首页 > 文章 > 丹江口水库生态屏障区柑橘-小飞蓬模式净氮矿化特征 草业科学 2017,34 (5) 915-923
Position: Home > Articles > Net nitrogen mineralisation characteristics of Citrus reticulate and Conyza canadensis in ecological barrier area of Danjiangkou Reservoir Pratacultural Science 2017,34 (5) 915-923

丹江口水库生态屏障区柑橘-小飞蓬模式净氮矿化特征

作  者：
占海歌;郭忠录;朱亮;王先舟;马中浩
单  位：
华中农业大学水土保持研究中心
关键词：
净氮矿化;总氮矿化量;植物化学性质;生态屏障区;丹江口水库
摘  要：
为探明水库生态屏障区典型植物群落氮矿化特征以及植物间是否存在相互作用,选取丹江口水库柑橘(Citrus reticulate)和小飞蓬(Conyza canadensis)群丛,采用室内模拟试验(25℃下培养61d),采取单一叶处理、单一根处理和根+叶混合处理,分别测定第1、3、7、14、21、31、41、51、61天的土壤氮矿化量,系统分析添加植物的土壤氮矿化特征。结果表明,1)添加植物后,土壤有机氮矿化表现出3个阶段,1-7d是土壤微生物适应期,7-41d土壤无机氮含量迅速变化,41-61d无机氮含量基本处于平衡;2)对土壤有机氮总矿化量进行方差分析,对同一器官处理,柑橘叶(GL)在整个试验期间均表现为显著(P<0.05)高于小飞蓬叶(PL),柑橘根(GR)与小飞蓬根(PR)试验中期和后期差异不显著(P>0.05)。同种植物间,GL与GR在整个试验期间差异显著,PL与PR除第41天外,试验期间差异显著;3)试验结束时,单一处理仅GL对土壤净氮矿化有促进作用,其它处理无效应,混合处理GL+PL和GL+PR表现促进作用,GR+PL和GR+PR无效应;4)相关性分析和主成分分析表明,植物全氮是影响土壤净氮矿化最重要的植物化学性质。总之,植物化学性质对土壤净氮矿化有重要影响,植物间混合处理是否具有激发效应受植物化学性质和培养条件等因素综合影响。
译  名：
Net nitrogen mineralisation characteristics of Citrus reticulate and Conyza canadensis in ecological barrier area of Danjiangkou Reservoir
作  者：
Zhan Hai-ge;Guo Zhong-lu;Zhu Liang;Wang Xian-zhou;Ma Zhong-hao;Research Center of Soil and Water Conservation,Huazhong Agricultural University;
关键词：
net N mineralisation;;total nitrogen mineralisation;;plant chemical properties;;ecological barrier area;;Danjiangkou Reservoir
摘  要：
Two typical species(Citrus reticulate and Conyza canadensis)from riparian buffer strips in the Danjiangkou Reservoir were selected to evaluate the soil nitrogen mineralisation characteristics of single leaf and/or root treatments and to examine whether the interactive effects between leaves and root mixed treatments existed under laboratory incubation conditions.We measured the rate of nitrogen mineralisation of the plants on days 1,3,7,14,21,31,41,51,and 61.The main results were summarised as follows:1)the laboratory incubation experiment had three stages,the first(1-7 days)comprised soil microbial adaptation,the content of mineral nitrogen was markedly increased in the second stage(7-41 days),and became steady in the final stage(41-61days);2)ANOVA strongly indicated that C.reticulate leaf treatment(GL)was correlated to C.canadensis leaf treatment(PL)in the whole incubation(P<0.05),but C.reticulate root treatment(GR)was not correlated to C.canadensis root treatment(PR)in the second and third stages(P>0.05).There was a strong correlation between GL and GR and PL and PR(except at day 41) in the plants;3)For single treatments,only GL promoted soil net N mineralisation,and GL+PL and GL+PR in mixed treatments,whereas others had no effect;and 4)the Pearson method and PCA demonstrated the total N of plant was the most important plant chemical property.In conclusion,the plant chemical properties played a key role in the net N mineralisation and the existence of interactive effects between mixed treatments depended on the plant chemical properties and incubation conditions.

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