摘要
为讨论生态化学计量特征与连作年限的关系,选取塔里木河上游阿拉尔垦区5、10、15、20和30年连作的棉田作为研究样地,分析棉花不同器官生态化学计量特征及其与土壤、产量的关系。结果表明:1)C质量分数、N∶P的平均值±标准差在叶片中最高((422.3±20.6)g/kg;11.4±4.6),N和P质量分数在棉籽中最高((38.1±11.8)g/kg;(14.4±5.0)g/kg),C与N、C与P质量比在纤维中最高(193.0±44.2;1 008.4±305.4);棉花各器官C、N和P随连作年限延长均表现为先增高后降低的趋势,C与N、C与P、N与P质量比无统一变化规律。2)棉花各器官C、N和P及计量比的变异性表现为N∶P>P>C∶P>C∶N>N>C;整体变异来源分析表明不同器官间对棉花C、N和P质量分数,C与N、C与P和N与P质量比变化的贡献大于连作年限间差异。3)棉花产量随连作年限延长表现为先增加后减少,在20年时最高,5年时最低;棉田土壤C和N质量分数,C∶N、C:P和棉花C均与棉花产量具有显著或极显著正相关关系。分析表明,棉花各器官生态化学计量特征在不同连坐年限中存在差异性,受N、P元素共同限制,同时与产量具有一定联系。
To study the stoichiometric characteristics of cotton at different continuous cropping years.the Alar Oasis in the upper reaches of the Tarim River was selected as the target area,and the cotton fields of 5,8,15,20,and 30 years of continuous cropping were selected as the study plots,and the ecological and chemical characteristics of cotton and yield were analyzed.The results showed that：1）The contents of C and N were the highest in leaves（（422.3±20.6）g/kg,11.4±4.6）,and the contents of N and P were the highest in cottonseed（（38.1±11.8）,（14.4±5.0）g/kg）.The C,N and P were the highest in the fiber（193.0±44.2,1 008.4±305.4）.The C,N and P of cotton were increased first and then decreased Trend,C∶N,C∶P,N∶P no uniform law of change.2）The variability of C,N,P and metering ratio of each organ in cotton was N∶P〉 P 〉C∶P 〉C∶N〉 N 〉C;the variance of the whole variance showed that C,N,P,C∶N,C∶P and N∶P were greater than those of continuous cropping.3）Cotton production with the extension of the number of years for the first increase after the reduction,the highest in 20 years,the lowest in5 years.The C,N,C∶N,C∶P and cotton C of cotton soil had significant or significant positive correlation with cotton yield.
作者
陈新
贡璐
李红林
罗艳
安申群
CHEN Xin;GONG Lu;LI Honglin;LUO Yan;AN Shenqun(College of Resources and Environment Science,Xinjiang University,Urumqi 830046,China;Key Laboratory of Oasis Ecology,Ministry of Education,Urumqi 830046,China)
出处
《中国农业大学学报》
CAS
CSCD
北大核心
2018年第9期89-99,共11页
Journal of China Agricultural University
基金
国家自然科学基金项目(41461105)
关键词
棉花
生态化学计量
营养元素
连作年限
产量
cotton
ecological stoichiometric
nutrient elements
continuous cropping years
yield
