Moderate clipping stimulates over-compensatory growth of Leymus chinensis under saline-alkali stress through high allocation of biomass and nitrogen to shoots

2020 ◽  
Vol 92 (1) ◽  
pp. 95-106
Author(s):  
Huimin Ma ◽  
Congcong Zheng ◽  
Yingzhi Gao ◽  
Carol C. Baskin ◽  
Hao Sun ◽  
...  
Keyword(s):  
Compensatory Growth ◽  
Leymus Chinensis ◽  
Alkali Stress

scholarly journals Cu and Na contents regulate N uptake of Leymus chinensis growing in soda saline-alkali soil

PLoS ONE ◽  
2020 ◽  
Vol 15 (12) ◽  
pp. e0243172
Author(s):  
Hongshan Liu ◽  
Yuefen Li ◽  
Shujie Li
Keyword(s):  
Vegetation Cover ◽  
N Uptake ◽  
Grassland Management ◽  
Leymus Chinensis ◽  
Alkali Resistance ◽  
Alkali Stress ◽  
Growth Limitation ◽  
Temperate Grasslands ◽  
Western Jilin Province ◽  
Western Jilin

Leymus chinensis (L. chinensis) is the dominant plant in the eastern margins of the Eurasian temperate grasslands. It is a very robust species, exhibiting good saline-alkali resistance and stabilizing soil. In this study, 67 soil samples and L. chinensis were collected in western Jilin province, China. The contents of N, P, K, S, Mn, Fe, Zn, Cu and Na were measured, revealing that the growth of L. chinensis was mainly restricted by N based on the stoichiometric N: P ratios of plant. Furthermore, path analysis indicated that N was significantly correlated with K, S, Cu, and Zn. Imbalances in the homeostasis of these four elements may thus constrain N. The homeostasis index of Cu (HCu) in sites with 100%-70% of vegetation cover was only 0.79, it was classified as a sensitive element. However, K, S and Zn, whose concentrations in L. chinensis were significantly related to those of N, exhibited no homeostatic characteristics. These results suggest that when seeking to treat saline-alkali stress, it is important to add fertilizers containing K, S, and Zn to avoid growth limitation. Na+, an ion associated with high soil alkalinity, exhibited weak homeostasis in L. chinensis even in sites with only 40%-10% of vegetation cover. When soil Na exceeded 16000 mg/kg, the homeostasis mechanism of L. chinensis appeared to be overwhelmed, resulting in rapid and probably harmful accumulation of Na. Proper control of N content can alleviate the toxicity of Na stress in L. chinensis and enhance its Na tolerance. Together, these results suggest that combined fertilization with N, K, S, Zn and Cu should be applied to improve grasslands growth. The results of this study can provide a reference basis for sustainable grassland management.

scholarly journals The Intensity of Simulated Grazing Modifies Costs and Benefits of Physiological Integration in a Rhizomatous Clonal Plant

2020 ◽  
Vol 17 (8) ◽  
pp. 2724
Author(s):  
Jushan Liu ◽  
Chen Chen ◽  
Yao Pan ◽  
Yang Zhang ◽  
Ying Gao
Keyword(s):  
Compensatory Growth ◽  
Grazing Intensity ◽  
Clonal Plants ◽  
Physiological Integration ◽  
Leymus Chinensis ◽  
Moderate Intensity ◽  
Heterogeneous Environments ◽  
Simulated Grazing ◽  
Net Benefits ◽  
Benefits And Costs

Clonal plants in grasslands are special species with physiological integration which can enhance their ability to tolerate herbivory stress especially in heterogeneous environments. However, little is known about how grazing intensity affects the trade-off between the benefits and costs of physiological integration, and the mechanism by which physiological integration improves compensatory growth in response to herbivory stress. We examined the effects of simulated grazing intensity on compensatory growth and physiological integration in a clonal species Leymus chinensis with a greenhouse experiment. This experiment was conducted in a factorial design involving nutrient heterogeneity (high-high, high-low, low-high, low-low), simulated grazing by clipping (0%, 25%, 50% or 75% shoot removal) and rhizome connection (intact versus severed) treatments. Compensatory indexes at 25% and 50% clipping levels were higher than that at 75% clipping level except in low-low nutrient treatments. Physiological integration decreased and increased compensatory indexes when the target-ramets worked as exporter and importer, respectively. Generally, clipping increased both benefits and costs of physiological integration, but its net benefits (benefits minus costs) changed with clipping intensity. Physiological integration optimized compensatory growth at light and moderate clipping intensity, and its net benefits determined the high capacity of compensatory growth. Grassland managements such as grazing or mowing at light and moderate intensity would maximize the profit of physiological integration and improve grassland sustainability.

scholarly journals Homeostatic responses and growth of Leymus chinensis under incrementally increasing saline-alkali stress

PeerJ ◽  
2021 ◽  
Vol 9 ◽  
pp. e10768
Author(s):  
Shujie Li ◽  
Yujin Huang ◽  
Yuefen Li
Keyword(s):  
Northern China ◽  
N:P Ratio ◽  
Leymus Chinensis ◽  
Alkali Stress ◽  
Negative Effects ◽  
Weakly Alkaline ◽  
Positive Effects ◽  
P Content ◽  
Rapid Changes ◽  
Alkaline Conditions

Despite considerable tolerance to salt and alkali stress, Leymus chinensis populations on the southwestern Songnen Plain in northern China are threatened by increasing soil salinity and alkalinity. To explore the species’ responses to saline-alkali stress, we grew it in substrates with varying concentrations of nitrogen (N) and phosphorus (P) while applying varying levels of saline-alkali stress (increasing in 14-, 17- or 23 -day intervals). We measured the plants’ contents of N and P, and the N:P ratio, and calculated their homeostasis indices (HN, HP and HN:P) under each nutrient and saline-alkali stress treatment. The N content was found to be more sensitive to saline-alkali stress than the P content. The N and P contents were highest and the N:P ratio was stable at pH 8.4. At both pH 8.1 and 8.4, HN:P> HN > HP, but the indices and their relations differed at other pH values. Exposure to saline-alkali stress for the 14-day incremental interval had weaker effects on the plants. Rapid changes in salinity-alkalinity weakened both the positive effects of the weakly alkaline conditions (pH 7.5–8.4) and the negative effects of more strongly alkaline conditions (pH 8.7 or 9.3) on L. chinensis. When L. chinensis plants lack N, applying N fertilizer will be extremely efficient. The optimal concentrations of N and P appeared to be 16 and 1.2 mmol/L, respectively. When the L. chinensis plants were N- and P-limited, the specific growth rate correlated positively with N:P, when limited by N it correlated positively with the environmental N concentration, and when limited by P it was weakly positively correlated with the environmental P concentration.

scholarly journals Effects of arbuscular mycorrhizal fungi on Leymus chinensis seedlings under salt–alkali stress and nitrogen deposition conditions: from osmotic adjustment and ion balance

RSC Advances ◽  
2018 ◽  
Vol 8 (26) ◽  
pp. 14500-14509 ◽  
Author(s):  
Jixiang Lin ◽  
Xiaoyuan Peng ◽  
Xiaoyu Hua ◽  
Shengnan Sun ◽  
Yingnan Wang ◽  
...  
Keyword(s):  
Arbuscular Mycorrhizal Fungi ◽  
Nitrogen Deposition ◽  
Mycorrhizal Fungi ◽  
Arbuscular Mycorrhizal ◽  
Leymus Chinensis ◽  
Alkali Stress ◽  
Ion Content ◽  
Ion Balance ◽  
Solute Accumulation ◽  
Deposition Conditions

We evaluated the contribution of arbuscular mycorrhizal fungi to the growth, ion content, and solute accumulation of Leymus chinensis seedlings under salt–alkali stress and nitrogen deposition.

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