干旱区生态环境知识资源中心(Arid): N、P施肥对塔里木河上游绿洲棉花C、N、P生态化学计量特征的影响

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	N、P施肥对塔里木河上游绿洲棉花C、N、P生态化学计量特征的影响
其他题名	Effects of nitrogen and phosphorus fertilizers on carbon,nitrogen,and phosphorus stoichiometry of oasis cotton in the upper reaches of Tarim River, Xinjiang, China
	贡璐; 李红林; 刘雨桐; 安申群
来源期刊	生态学报
ISSN	1000-0933
出版年	2017
卷号	37 期号:22 页码:7689-7697
中文摘要	施肥通过外源物质的添加直接干预了农田生态系统中作物元素的运移循环过程。通过野外N、P施肥试验,测定棉花各生育期碳(C)、氮(N)、磷(P)元素含量及其生物量,分析棉株C、N、P元素的分配规律,探讨棉株对生长速率调控的内在机制,获得棉株体内N、P元素的内稳性指数,并判断其限制性元素类型。结果表明:棉花C、N、P元素平均含量分别为388.7、20.97、 3.43 g/kg;棉花比生长速率与N:P、C:P间均存在负相关关系,棉花生长符合生长速率假说;N、P元素内稳性指数H分别在1.02-5.28、1.01 4.55范围内。叶片N:P可表征植物限制性元素类型,棉花最大生长速率所对应的叶片N:P为13,是判断限制元素的标准;综合棉花生长速率和内稳性指数研究可知研究区棉花生长受到N、P元素的共同限制,同时,在生长前期更易受P元素的限制,生长后期更易受N元素的限制。
英文摘要	C,N,and P are the basic elements required for plant growth and regulation and their balance and stability plays an important role in many physiological functions. Ecological stoichiometry combines the first law of thermodynamics, the theory of evolution by natural selection,and the central dogma of molecular biology and has organically integrated biological studies at the scales of molecules, cells, species groups, communities, and ecosystems. C, N, and P stoichiometry of plants reflects a complex interplay that is the result of adaptation of plants to changing biological and abiotic environments during the process of evolution. Therefore, it is important to investigate the patterns of stoichiometric flexibility within and among plant species. Homeostasis and the growth rate hypothesis (GRH) have always been considered as the two important theories of ecological stoichiometry. Homeostasis is the ability of organisms to maintain relatively stable chemical compositions regardless of the environmental changes. The growth rate hypothesis considers that there is a close relationship between C:N:P stoichiometry and growth rate and it proposes that fast-growing organisms have low biomass C:P and N:P ratios. Fertilization by the addition of exogenous substances directly disturbs the migration of elements and circulation of crop in the farmland ecosystem. To further understand the response of crop growth to fertilization, in this study, we measured the cotton C, N,and P contents and the biomass of cotton plant in a pot experiment involving the addition of N and P fertilizers,conducted in the upper reaches of Tarim River. Our results showed that the mean content of C,N,and P was 388.7,20.97,and 3.43 g/kg, respectively. The growth rate of cotton decreased with increasing leaf N:P or C:P,and the growth of cotton was consistent with GRH. Plants with higher H (H is the homeostasis index) have stronger homeostasis, that is, they have stronger control over element change. The values of H in cotton ranged from 1.02 to 5.28 for N and from 1.01 to 4.55 for P. Researchers have reported that homeostasis is gradually enhanced from prokaryotic to eukaryotic organisms. H of cotton was between those of prokaryotic and eukaryotic organisms,and was consistent with the results of earlier studies. The leaf N:P ratios have been widely used to indicate the availability and limitation of soil nutrients. Cotton growth was mainly restricted by N and P. For cotton, the value of leaf N:P was 13 at the maximum growth rate, which was the standard of judging the limiting element. It conformed to the law of demand for cotton growth.
中文关键词	限制性元素 ; 生长速率假说 ; 内稳性 ; 绿洲棉花 ; 塔里木河上游
英文关键词	restrictive elements growth rate hypothesis homeostasis oasis cotton upper reaches of the Tarim River
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRONOMY
WOS研究方向	Agriculture
CSCD记录号	CSCD:6121791
来源机构	新疆大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/236534
作者单位	新疆大学资源与环境科学学院, 绿洲生态教育部重点实验室, 乌鲁木齐, 新疆 830046, 中国
推荐引用方式 GB/T 7714	贡璐,李红林,刘雨桐,等. N、P施肥对塔里木河上游绿洲棉花C、N、P生态化学计量特征的影响[J]. 新疆大学,2017,37(22):7689-7697.
APA	贡璐,李红林,刘雨桐,&安申群.(2017).N、P施肥对塔里木河上游绿洲棉花C、N、P生态化学计量特征的影响.生态学报,37(22),7689-7697.
MLA	贡璐,et al."N、P施肥对塔里木河上游绿洲棉花C、N、P生态化学计量特征的影响".生态学报 37.22(2017):7689-7697.