Seasonal changes in the effects of free-air CO2 enrichment (FACE) on nitrogen (N) uptake and utilization of rice at three levels of N fertilization

Seasonal Variations in Carbon, Nitrogen and Phosphorus Concentrations and C:N:P Stoichiometry in the Leaves of Differently Aged Larix principis-rupprechtii Mayr. Plantations

“…Previous studies have indicated that nutrient elements in plants are affected by a dilution effect caused by increases in plant size and biomass [16,38,39]; moreover, the element concentrations in leaves decrease with plant ontogenetic development [3,4,8,40]. In our study, the dilution effect affected P concentrations more than it did C and N concentrations.…”

“…Such variations may be related to the migration of nutrient elements caused by changes in the balance between the uptake and utilization efficiency of these elements and differences in C fixation ability and N and P-use efficiency among the different growing seasons. These phenomena may lead to differences in the C, N and P concentrations of plant leaves [3,4,29].…”

“…Carbon (C), nitrogen (N) and phosphorus (P) are essential for plant growth and are vital in nutrient cycling, forest succession and the sustainable management of forest ecosystems. Carbon forms the structural basis of plants and constitutes one-half of the dry mass of plants [2][3][4][5]. Soil nutrient classification based on the national standard classification for soil nutrient content in 1982.…”

Plant Architecture and Flag Leaf Morphology of Rice Crops Exposed to Experimental Warming with Elevated CO2

“…Under elevated [CO2], despite a significant increase in root biomass (data not shown), as has open been reported ( (Kim et al, 2003;Ziska and Bunce, 2007;Yang et al, 2007), the root : shoot ratio was not altered in this study. This suggested that elevated [CO2] is unlikely to change the balance between above-and below-ground developments of rice cultivar used (i.e.…”

“…However, this does not mean that leaf angle would also be unchanged. Assuming that leaf angle is in inverse relation to leaf nitrogen (N) content (Chen et al, 2003), rice crops grown in elevated [CO2] will be expected to have more erect leaves than those in ambient [CO2] because rice plants showed a significant reduction in leaf N content at elevated [CO2] (Kim et al, 2003(Kim et al, , 2011Seneweera et al, 2011;Yang et al, 2007). On the other hand, elevated Ta significantly increased the fraction of LAI distributed into the upper layer (75-90 cm), but decreased that distributed into the lower layer (45-60 cm) both under ambient and elevated [CO2] (Fig.…”