Six tea plantations with different soil-forming parent materials, the same tea variety and tea age and similar landforms and management were selected to conduct a systematic study on the relationship between soil prop...Six tea plantations with different soil-forming parent materials, the same tea variety and tea age and similar landforms and management were selected to conduct a systematic study on the relationship between soil properties and tea quality. The results showed that the quality of tea grown on the soils derived from granites, arenaceous shales, argillaceous sandstones, was superior; those on the soils derived from limestones,dolomites, Quaternary red clays, were inferior. Further study showed that sandy soils were beneficial to improving amino acid content of tea, and clayey soils made it decrease; high content of bases might decrease the contents of tea polypenols, caffeine, water extracts, but promote the content of amino acids; available phosphorous was significantly positively correlated with water extracts, but significantly negatively correlated with carbine; slowly available potassium was positively correlated with amino acid content. Soil parent materials should be regarded as an important factor in evaluating the adaptability of tea to soils.展开更多
Nutrient resorption is a crucial mechanism for plant nutrient conservation,but most previous studies did not consider the leaf-mass loss during senescence due to lack of measured data.This would lead to an underestima...Nutrient resorption is a crucial mechanism for plant nutrient conservation,but most previous studies did not consider the leaf-mass loss during senescence due to lack of measured data.This would lead to an underestimation of nutrient resorption efficiency(NuRE),or calculating NuRE of various species based on the average mass loss at plant-functional-group level in the literature,thus affecting its accuracy.Here we measured the leaf-mass loss to correct NuRE with the species-specific mass loss correction factor(MLCF),so as to foster a more accurate calculation of the nutrient fluxes within and between plants and the soil.Green leaves and senesced leaves were collected from 35 dominant woody plants in northern China.Mass of green and senesced leaves were measured to calculate the MLCF at species level.The MLCF was reported for each of the 35 dominant woody plants in northern China.These species averagely lost 17%of the green-leaf mass during leaf senescence,but varied greatly from 1.3%to 36.8%mass loss across the 35 species,or 11.7%to 19.6%loss across the functional types.Accordingly,the MLCF varied from 0.632 to 0.987 across the 35 species with an average value 0.832.The NuRE corrected with MLCF was remarkably increased on the whole(e.g.both the average nitrogen and phosphorus NuRE became about 9%higher,or more accurate),compared with the uncorrected ones,especially in the case of low resorption efficiencies.Our field data provide reliable references for the MLCF of plants in related regions at both species and functional-type levels,and are expected to promote more accurate calculations of NuRE.展开更多
文摘Six tea plantations with different soil-forming parent materials, the same tea variety and tea age and similar landforms and management were selected to conduct a systematic study on the relationship between soil properties and tea quality. The results showed that the quality of tea grown on the soils derived from granites, arenaceous shales, argillaceous sandstones, was superior; those on the soils derived from limestones,dolomites, Quaternary red clays, were inferior. Further study showed that sandy soils were beneficial to improving amino acid content of tea, and clayey soils made it decrease; high content of bases might decrease the contents of tea polypenols, caffeine, water extracts, but promote the content of amino acids; available phosphorous was significantly positively correlated with water extracts, but significantly negatively correlated with carbine; slowly available potassium was positively correlated with amino acid content. Soil parent materials should be regarded as an important factor in evaluating the adaptability of tea to soils.
基金TheNational Key Researchand Development Program of China(2018YFC0507204)"Strategic Priority Research Program"of the Chinese Academy of Sciences(XDA26040202)the National Natural Science Foundation of China(41473068).
文摘Nutrient resorption is a crucial mechanism for plant nutrient conservation,but most previous studies did not consider the leaf-mass loss during senescence due to lack of measured data.This would lead to an underestimation of nutrient resorption efficiency(NuRE),or calculating NuRE of various species based on the average mass loss at plant-functional-group level in the literature,thus affecting its accuracy.Here we measured the leaf-mass loss to correct NuRE with the species-specific mass loss correction factor(MLCF),so as to foster a more accurate calculation of the nutrient fluxes within and between plants and the soil.Green leaves and senesced leaves were collected from 35 dominant woody plants in northern China.Mass of green and senesced leaves were measured to calculate the MLCF at species level.The MLCF was reported for each of the 35 dominant woody plants in northern China.These species averagely lost 17%of the green-leaf mass during leaf senescence,but varied greatly from 1.3%to 36.8%mass loss across the 35 species,or 11.7%to 19.6%loss across the functional types.Accordingly,the MLCF varied from 0.632 to 0.987 across the 35 species with an average value 0.832.The NuRE corrected with MLCF was remarkably increased on the whole(e.g.both the average nitrogen and phosphorus NuRE became about 9%higher,or more accurate),compared with the uncorrected ones,especially in the case of low resorption efficiencies.Our field data provide reliable references for the MLCF of plants in related regions at both species and functional-type levels,and are expected to promote more accurate calculations of NuRE.
