水土保持研究2018，Vol.25Issue(2)：112-119,8.
塔里木河上游绿洲农田不同生育期玉米根茎叶生态化学计量特征
Stoichiometry Characteristics of Root, Stem and Leaf of Maize in Different Growth Stages in the Upper Reaches of the Tarim River
摘要
Abstract
The main purposes of this study were to reveal the adaptation mechanism of maize to environment change in oasis farmland,to provide scientific basis for optimal management of oasis farmland ecosystem and protection of oasis resources.We took maize of oasis farmland in the upper reaches of the Tarim River as the sites.The chemical characteristics of carbon (C),nitrogen (N) and phosphorus (P) in roots,stems and leaves of different growth stages were analyzed.The results showed that the mean contents of C,N and P were 311.97,16.41 and 2.54 mg/g,respectively.The the mean contents of C,N in maize organs decreased in the order:leaves＞stems＞roots,and P in maize decreased in the sequence:stems＞ leafs＞ roots,the changes in C:N and C ∶ P ratios followed the order:leaves＞roots＞stems,whereas the change in N:P follow the sequence:leaves＞stems＞roots.The contents of C,N,P and their ecological stoichiometry ratios in roots,stems and leaves were significantly different among four growth stages.By comparison and analysis,the content of C in leaf was significantly higher at jointing stage than other growth stages;C content of stem was not significantly different at different growth stages;C content of root was significantly lower than other growth stages.The contents of N in leaf and stem were significantly higher at jointing stage than other growth stages;while the content of N in root was not significantly different.P content of leaf was significantly higher at milking stage than other growth stages,while P content of stem was significantly lower at milking stage than other growth stages,the content of P in root was significantly higher during maturation stage.The C:N ratio in leaf at maturation stage was significantly higher than other growth stage,the C ∶ P ratios of stem and root at milking stage were significantly higher than other growth stage,compared with other ratios,the N:P ratio of leaf was significantly lower at milking stage than other growth stages,the N:P ratios of stem and root were significantly lower at maturation stage than other growth stage.The ratio of N:P was less than 14,which indicated that the growth of maize was mainly limited by N.According to the factorial analysis of GLM,it was concluded that growth stages and organs had certain influences on the contents of C,N and P and the ratios.It showed that the content of P,the ratios of C:N and C:P were mainly depended on the growth stages,the contents of C,N and the ratio of N:P were mainly determined by the organs.关键词
玉米/生态化学计量学/生育期/器官/塔里木河上游Key words
maize/stoichiometry/growth stage/organ/the upper reaches of the Tarim River分类
农业科技引用本文复制引用
罗艳,贡璐,李杨梅..塔里木河上游绿洲农田不同生育期玉米根茎叶生态化学计量特征[J].水土保持研究,2018,25(2):112-119,8.基金项目
国家自然科学基金“绿洲农田生态系统生态化学计量特征及其对养分限制的指示”(41461105) （41461105）
