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论文题目: Nitrogen addition can improve seedling establishment of N-sensitive species in degraded saline soils
英文论文题目: Nitrogen addition can improve seedling establishment of N-sensitive species in degraded saline soils
第一作者: 张红香
英文第一作者: Hong X.Zhang
联系作者: 张红香
英文联系作者: Hong X.Zhang
发表年度: 2019
卷: 30
期: 2
页码: 119-127
摘要:

Salinization is an important cause of land degradation globally, and these soils are usually nutrient deficient, which inhibits plant establishment and growth. Medicago sativaand Leymus chinensis are important legume and grass forage species, respectively, in China and are frequently used in pasture establishment. We aimed to test whether nitrogen (N) addition can increase the salt tolerance of these two glycophytes and whether the two species inhibit each other at the germination and seedling emergence stages. M. sativa and L. chinensis seeds were germinated separately or together in 0, 100, and 200mM NaCl solutions with supplemental 0, 20, or 40mM N solutions. N addition increased germination percentage and rate, shoot length, and seedling N concentration under moderate NaCl conditions for L. chinensis but had no effect on Na+concentrations. Conversely, N addition stimulated Na+ uptake in M. sativa, but it had little effect on germination parameters, with salt suppressing N uptake. The presence of M. sativa stimulated L. chinensis germination percentage in mixed treatments. Our results suggest that proper N application may aid establishment of Nsensitive species L. chinensis in grasslegume mixtures in degraded saline soils, through both direct influence as a nutritional and/or osmotic resource and indirect effect by increasing salt sequestration by M. sativa. N application had little effect on establishment of the Nfixing species M. sativa. 

英文摘要:

Salinization is an important cause of land degradation globally, and these soils are usually nutrient deficient, which inhibits plant establishment and growth. Medicago sativaand Leymus chinensis are important legume and grass forage species, respectively, in China and are frequently used in pasture establishment. We aimed to test whether nitrogen (N) addition can increase the salt tolerance of these two glycophytes and whether the two species inhibit each other at the germination and seedling emergence stages. M. sativa and L. chinensis seeds were germinated separately or together in 0, 100, and 200mM NaCl solutions with supplemental 0, 20, or 40mM N solutions. N addition increased germination percentage and rate, shoot length, and seedling N concentration under moderate NaCl conditions for L. chinensis but had no effect on Na+concentrations. Conversely, N addition stimulated Na+ uptake in M. sativa, but it had little effect on germination parameters, with salt suppressing N uptake. The presence of M. sativa stimulated L. chinensis germination percentage in mixed treatments. Our results suggest that proper N application may aid establishment of Nsensitive species L. chinensis in grasslegume mixtures in degraded saline soils, through both direct influence as a nutritional and/or osmotic resource and indirect effect by increasing salt sequestration by M. sativa. N application had little effect on establishment of the Nfixing species M. sativa. 

刊物名称: Land Degradation & Development
英文刊物名称: Land Degradation & Development
参与作者: H. X. Zhang, Y. Xiang, L. J. Irving, Q. Li and D. W. Zhou
英文参与作者: H. X. Zhang, Y. Xiang, L. J. Irving, Q. Li and D. W. Zhou
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