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化肥不同用量对有机基质栽培甜椒产量、品质及养分吸收的影响 被引量:2
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作者 吕晓惠 杨宁 +1 位作者 李絮花 王克安 《山东农业科学》 2013年第7期91-94,共4页
试验采用有机基质栽培的方法研究化肥不同施用量对甜椒产量、品质及养分吸收量、吸收比率的影响。结果表明:适量施用化肥可显著提高甜椒果实产量、可溶性糖和维生素C含量。化肥施用过多,增产效果不明显,硝酸盐含量显著增加。每生产1 000... 试验采用有机基质栽培的方法研究化肥不同施用量对甜椒产量、品质及养分吸收量、吸收比率的影响。结果表明:适量施用化肥可显著提高甜椒果实产量、可溶性糖和维生素C含量。化肥施用过多,增产效果不明显,硝酸盐含量显著增加。每生产1 000 kg甜椒对氮磷钾吸收量为N 3.791 kg、P2O50.924 kg、K2O5.711 kg;吸收比率以N∶P2O5∶K2O=4.098∶1∶6.172效果最好。 展开更多
关键词 甜椒 有机基质 化肥 产量 品质 养分吸收比率
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N limitation increases along a temperate forest succession:evidences from leaf stoichiometry and nutrient resorption 被引量:5
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作者 Peng Zhang Xiao-Tao Lu +2 位作者 Mai-He Li Tonggui Wu Guangze Jin 《Journal of Plant Ecology》 SCIE CSCD 2022年第5期1021-1035,共15页
Forest productivity and carbon(C) sequestration largely depend on soil N and P availability.To date,however,the temporal variation of nutrient limitation along forest succession is still under debate.Leaf stoichiometr... Forest productivity and carbon(C) sequestration largely depend on soil N and P availability.To date,however,the temporal variation of nutrient limitation along forest succession is still under debate.Leaf stoichiometry and nutrient resorption are important indicators for predicting nutrient limitation of plant growth.Here,we measured nitrogen(N)and phosphorus(P)concentrations in green leaves and leaf liter for all woody species at four stages of temperate forest succession,and analyzed how abiotic and biotic factors affect leaf stoichiometry and nutrient resorption along forest succession.At the individual scale,leaf N and P concentrations had a significant increase at the end of the succession,while no change in leaf N:P ratio was detected.Nitrogen resorption efficiency(NRE)increased significantly with succession,but P resorption efficiency(PRE)first increased and then decreased.Significant increases in NRE:PRE ratios only occurred at the end of the succession.Moreover,plant N cycling was less responsive to soil nutrient than P cycling.At the community scale,we found that leaf N and P concentrations first decreased and then increased along forest succession,which were mainly affected by Shannon-Wiener index and species richness.Leaf N:P ratio significantly varied with succession and was mainly determined by community-weighted mean diameter at breast height(DBH).NRE increased and was significantly influenced by species richness and DBH,while PRE was relatively stable along forest succession.Thus,the NRE:PRE ratios significantly increased,indicating that N limitation is exacerbated with the temperate forest succession.These results might reflect the intense interspecific competition for limiting resource in a higher biodiversity community.In conclusion,our findings highlight the importance of biotic factors in driving forest ecosystem nutrient cycling and provide valuable information for sustainable fertilizer management practices in China's temperate and boreal forests. 展开更多
关键词 abiotic and biotic factors forest succession N limitation N:P ratio nutrient resorption efficiency temperate forest
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