Abstract
Phosphorus(P)deficiency is one of the main factors that influences productivity in agricultural and forestry systems. Fertilization and soil improvement are the primary measures to meet the P demands in traditional agri-forestry production. Recently,plants with high phosphorus use efficiency have been discovered and used to replace traditional measures for improving phosphorus use efficiency of crops. A-65/27,A-65/31 and A-61/186 are only there evergreen poplar clones in the world. Their common features are easily cutting propagation,higher afforestation survival rate and fast-growing evergreen poplar clones with high yield and excellent wood quality. Tree species resources of south timber forests would be abounded significantly through extensively planting these poplar clones. In order to understand the P demands of evergreen poplar clones. The sand potted evergreen poplar clones were subjected to five P supply levels:0.00,0.031 0,0.061 9,0.123 9,0.185 8 g·L-1. The results showed that the phosphorus concentration of 0.061 9 g·L-1 would be able to meet the basic needs of the phosphorus for the growth of evergreen poplar clones. Lacking of phosphorus would significantly affect the growth of height,ground diameter and biomass. And photosynthetic rate under low-phosphorus stress decreased significantly. Through analysis of changing trends of stoma conductance and intercellular CO2 concentration,it would be known that main reasons of photosynthetic rate declining were non-stomatal constraint. The chlorophyll fluorescence measured synchronously was affected also,and this was one of the factors of non-stomatal constraint.
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Claims 5
Claim · model-written summary
A phosphorus concentration of 0.061 9 g·L-1 met basic growth needs of evergreen poplar clones.
Verbatim
e0“the phosphorus concentration of 0.061 9 g·L-1 would be able to meet the basic needs of the phosphorus for the growth of evergreen poplar clones”
Claim · model-written summary
Phosphorus deficiency significantly affected poplar height, ground diameter and biomass growth.
Not reportedTaxonComparatorDirection
Verbatim
e0“Lacking of phosphorus would significantly affect the growth of height,ground diameter and biomass”
Claim · model-written summary
Low-phosphorus stress significantly decreased photosynthetic rate.
Not reportedTaxonComparator
Verbatim
e0“photosynthetic rate under low-phosphorus stress decreased significantly”
Claim · model-written summary
Non-stomatal constraint was identified as the main cause of declining photosynthetic rate.
Not reportedTaxon
Verbatim
e0“main reasons of photosynthetic rate declining were non-stomatal constraint”
Claim · model-written summary
Chlorophyll fluorescence was also affected under phosphorus stress.
Not reportedTaxonDirection
Verbatim
e0“The chlorophyll fluorescence measured synchronously was affected also,and this was one of the factors of non-stomatal constraint”