Variation in Leaf Nitrogen and Phosphorus Stoichiometry in Different Functional Groups of Legumes

2020 ◽  
Author(s):  
Z. Y. Shi ◽  
S. X. Xu ◽  
S. C. Lu ◽  
M. Yang ◽  
M. G. Zhang ◽  
...  
Keyword(s):  
Functional Groups ◽  
Negative Correlation ◽  
Woody Plants ◽  
Leaf Nitrogen ◽  
Nitrogen And Phosphorus ◽  
N:P Ratios ◽  
Leaf N Concentration ◽  
Tree Leaf ◽  
Leaf Nitrogen And Phosphorus ◽  
Leaf N

The legume is notable owing to their symbiotic nitrogen (N) fixing ability. Usually, higher leaf N concentration and N to phosphorus (P) ratio (N:P) in legumes than non-legumes. However, the variations of leaf N, P and N:P and their relationship had been hardly studied based on functional groups. In this study, we studied the leaf N, P and N:P and their relationship among different functional groups. The results showed that the average values of leaf N, P and N:P ratios for all legumes were 27.33 mg g-1, 1.27 mg g-1 and 21.94, respectively. Leaf N (36.96 mg g-1) and P (2.15 mg g-1) of herbaceous legumes are significantly higher than N (24.97 mg g-1) and P (1.18 mg g-1) in woody plants, respectively. Moreover, leaf N, P and N:P of shrub markedly higher than them in tree. Leaf N and P are always higher in deciduous than evergreen legumes. A negative correlation was found between leaf N:P and P in overall and different functional groups of legumes.

scholarly journals Global leaf nitrogen and phosphorus stoichiometry and their scaling exponent

2017 ◽  
Vol 5 (5) ◽  
pp. 728-739 ◽  
Author(s):  
Di Tian ◽  
Zhengbing Yan ◽  
Karl J Niklas ◽  
Wenxuan Han ◽  
Jens Kattge ◽  
...  
Keyword(s):  
Functional Groups ◽  
Woody Plants ◽  
Terrestrial Ecosystems ◽  
Life Forms ◽  
Leaf Nitrogen ◽  
Scaling Exponent ◽  
Nitrogen And Phosphorus ◽  
Data Set ◽  
Scaling Relationships ◽  
Leaf N

Abstract Leaf nitrogen (N) and phosphorus (P) concentrations constrain photosynthetic and metabolic processes, growth and the productivity of plants. Their stoichiometry and scaling relationships regulate the allocation of N and P from subcellular to organism, and even ecosystem levels, and are crucial to the modelling of plant growth and nutrient cycles in terrestrial ecosystems. Prior work has revealed a general biogeographic pattern of leaf N and P stoichiometric relationships and shown that leaf N scales roughly as two-thirds the power of P. However, determining whether and how leaf N and P stoichiometries, especially their scaling exponents, change with functional groups and environmental conditions requires further verification. In this study, we compiled a global data set and documented the global leaf N and P concentrations and the N:P ratios by functional group, climate zone and continent. The global overall mean leaf N and P concentrations were 18.9 mg g−1 and 1.2 mg g−1, respectively, with significantly higher concentrations in herbaceous than woody plants (21.72 mg g−1 vs. 18.22 mg g−1 for N; and 1.64 mg g−1 vs. 1.10 mg g−1 for P). Both leaf N and P showed higher concentrations at high latitudes than low latitudes. Among six continents, Europe had the highest N and P concentrations (20.79 and 1.54 mg g−1) and Oceania had the smallest values (10.01 and 0.46 mg g−1). These numerical values may be used as a basis for the comparison of other individual studies. Further, we found that the scaling exponent varied significantly across different functional groups, latitudinal zones, ecoregions and sites. The exponents of herbaceous and woody plants were 0.659 and 0.705, respectively, with significant latitudinal patterns decreasing from tropical to temperate to boreal zones. At sites with a sample size ≥10, the values fluctuated from 0.366 to 1.928, with an average of 0.841. Several factors including the intrinsic attributes of different life forms, P-related growth rates and relative nutrient availability of soils likely account for the inconstant exponents of leaf N vs. P scaling relationships.

Leaf Nitrogen and Phosphorus Stoichiometry are Closely Linked with Mycorrhizal Type Traits of Legume Species

2020 ◽  
Author(s):  
Z. Y. Shi ◽  
S. X. Xu ◽  
M. Yang ◽  
M. G. Zhang ◽  
S. C. Lu ◽  
...  
Keyword(s):  
Functional Groups ◽  
Terrestrial Ecosystem ◽  
Arbuscular Mycorrhizas ◽  
Leaf Nitrogen ◽  
Plant Functional Groups ◽  
Nitrogen And Phosphorus ◽  
Climate Zones ◽  
Type Traits ◽  
Leaf Nitrogen And Phosphorus ◽  
Leaf N

Arbuscular mycorrhizas (AM) are the most widely symbiosis in terrestrial ecosystem. Leaf N and P are the most important plant functional traits due to their influence on biogeochemical cycling. However, as the notable nitrogen (N) fixing plants, the variations of leaf N, P and N:P and their relationship among mycorrhizal types had been hardly studied based on functional groups. In this study, we studied the leaf N, P and N:P and their relationship between AM and other mycorrhizal types (others) among different functional groups or climate zones. The results indicated that AM improve significantly leaf N and P, while reduce N:P comparing to others. However, the influences of AM and others on leaf N, P and N:P changed with plant functional groups or climate zone. The relationships between leaf N and P, between N and N:P and between P and N:P also exhibit great variation between AM and Others.

Optical sensing estimation of leaf nitrogen concentration in maize across a range of water-stress levels

2011 ◽  
Vol 62 (6) ◽  
pp. 474 ◽  
Author(s):  
Tong-Chao Wang ◽  
B. L. Ma ◽  
You-Cai Xiong ◽  
M. Farrukh Saleem ◽  
Feng-Min Li
Keyword(s):  
Water Stress ◽  
Vegetation Index ◽  
Optical Sensing ◽  
Leaf Nitrogen ◽  
Growth Stages ◽  
N Concentration ◽  
Leaf N Concentration ◽  
Chlorophyll Index ◽  
Plant Moisture ◽  
Leaf N

Optical sensing techniques offer an instant estimation of leaf nitrogen (N) concentration during the crop growing season. Differences in plant-moisture status, however, can obscure the detection of differences in N levels. This study presents a vegetation index that robustly measures differences in foliar N levels across a range of plant moisture levels. A controlled glasshouse study with maize (Zea mays L.) subjected to both water and N regimes was conducted in Ottawa, Canada. The purpose of the study was to identify spectral waveband(s), or indices derived from different wavebands, such as the normalised difference vegetation index (NDVI), that are capable of detecting variations in leaf N concentration in response to different water and N stresses. The experimental design includes three N rates and three water regimes in a factorial arrangement. Leaf chlorophyll content and spectral reflectance (400–1075 nm) were measured on the uppermost fully expanded leaves at the V6, V9 and V12 growth stages (6th, 9th and 12th leaves fully expanded). N concentrations of the same leaves were determined using destructive sampling. A quantitative relationship between leaf N concentration and the normalised chlorophyll index (normalised to well fertilised and well irrigated plants) was established. Leaf N concentration was also a linear function (R2 = 0.9, P < 0.01) of reflectance index (NDVI550, 760) at the V9 and V12 growth stages. Chlorophyll index increased with N nutrition, but decreased with water stress. Leaf reflectance at wavebands of 550 ± 5 nm and 760 ± 5 nm were able to separate water- and N-stressed plants from normal growing plants with sufficient water and N supply. Our results suggest that NDVI550, 760 and normalised chlorophyll index hold promise for the assessment of leaf N concentration at the leaf level of both normal and water-stressed maize plants.

The stoichiometry of leaf nitrogen and phosphorus resorption in plantation forests

2020 ◽  
pp. 118743
Author(s):  
Dalong Jiang ◽  
Baoling Yang ◽  
Xiaoli Cheng ◽  
Han Y.H. Chen ◽  
Honghua Ruan ◽  
...  
Keyword(s):  
Leaf Nitrogen ◽  
Nitrogen And Phosphorus ◽  
Plantation Forests ◽  
Leaf Nitrogen And Phosphorus

Leaf nitrogen and phosphorus stoichiometry of Quercus species across China

2012 ◽  
Vol 284 ◽  
pp. 116-123 ◽  
Author(s):  
Tonggui Wu ◽  
Yi Dong ◽  
Mukui Yu ◽  
G. Geoff Wang ◽  
De-Hui Zeng
Keyword(s):  
Leaf Nitrogen ◽  
Nitrogen And Phosphorus ◽  
Quercus Species ◽  
Leaf Nitrogen And Phosphorus
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