Effects of salinity and nitrogen on cotton growth in arid environment
Effects of salinity and nitrogen on cotton growth in arid environment
复制标题
干旱环境下盐度和氮素对棉花生长的影响
DOI：
10.1007/s11104-008-9881-0
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发表时间：
2010-01-01
期刊：
影响因子：
4.9
通讯作者：
Wei, Changzhou
中科院分区：
文献类型：
--
作者：
Chen, Weiping;Hou, Zhenan;Wei, Changzhou
通过温室盆栽试验，研究了不同施氮量和土壤盐分水平对棉花生长和氮素吸收的影响。结果表明，土壤盐分和氮盐互作对棉花株高生长有显著影响，但单施氮肥对棉花株高生长影响不显著。棉花在出苗期和生长初期对盐分的敏感性高于生长后期。在中低盐度土壤中，施肥可缓解对生长的抑制作用。土壤盐分是影响棉花地上部干物质和根系发育的主导因子。当土壤含盐量从对照水平2.4 dS m− 1分别增加到7.7 dS m−1、12.5 dS m− 1和17.1 dS m−1时，种子干质量分别减少22%、52%和84%。在低、中盐条件下，氮素吸收量随施氮量的增加而增加，但不受施氮量的影响。在较高的盐度，氮吸收是独立的氮率，主要受土壤盐分。钾的吸收随土壤盐分的增加而降低。植物组织中Na、Cl和Ca的含量随土壤盐分的增加而增加，以棉花叶片中的含量最高。
The influences of different N fertilization rates and soil salinity levels on the growth and nitrogen uptake of cotton was evaluated with a pot experiment under greenhouse conditions. Results showed that cotton growth measured as plant height was significantly affected by the soil salinity and N-salinity interaction, but not by N alone. Cotton was more sensitive to salinity during the emergence and early growth stages than the later developmental stages. At low to moderate soil salinity, the growth inhibition could be alleviated by fertilizer application. Soil salinity was a dominated factor affecting cotton’s above-ground dry mass and root development. Dry mass of seed was reduced by 22%, 52%, and 84% respectively, when the soil salinity level increased from control level of 2.4 dS m−1to 7.7 dS m−1, 12.5 dS m−1and to 17.1 dS m−1, respectively. N uptake increased with N fertilization at adequate rates at both low and medium soil salinities but was not influenced by over N fertilization. At higher salinities, N uptake was independent of N rates and mainly influenced by soil salinity. The uptake of K decreased with soil salinity. The concentration of Na, Cl and Ca in plant tissues increased with soil salinity with highest concentrations in the cotton leaf.