According to Rural Poverty Al eviation Development Outline in China （2011-2020） and new impoverished population standards, key poverty-stricken coun-ties increase from 51 to 58 in Gansu, and the impoverished populat...According to Rural Poverty Al eviation Development Outline in China （2011-2020） and new impoverished population standards, key poverty-stricken coun-ties increase from 51 to 58 in Gansu, and the impoverished population from 3.00 mil ion to 13.00 mil ion, and poverty-stricken area from 16% to 80%. Meanwhile, Rural Poverty Al eviation Development Outline in China （2011-2020） describes that poverty al eviation work in China has turned from resolving subsistence issue to consolidating present achievements, speeding up casting off poverty to get rich, im-proving eco-environment and development capacity, and reducing development gap. Confronted by new tasks in the new age, it is necessary to adjust work principles, make summary and develop innovation modes, to explore development mode of poverty al eviation in rural areas in Gansu in new age.展开更多
Seedlings of wheat (Triticum aestivum L.), Chinese cabbage (Brassica campestris L.) and mung bean (Phaseolus radiatus L.) were grown for 30 days in sterile sand media with 6 N treatments, i.e. NH4+-N, glycine-N, 3 dif...Seedlings of wheat (Triticum aestivum L.), Chinese cabbage (Brassica campestris L.) and mung bean (Phaseolus radiatus L.) were grown for 30 days in sterile sand media with 6 N treatments, i.e. NH4+-N, glycine-N, 3 different ratios of glycine-N:NH4+-N (NH4+-N was labeled with 15N) and a control receiving no N, to assess the importance of amino acids in excessive N nutrition along with inorganic N interactions. The contribution of nitrogen derived from glycine-N to total plant N was investigated. The total plant N of the three species treated with N was significantly greater (P < 0.05) than the control treatment. Also, seedlings from all the three species had significantly more total N as NH4+-N (P < 0.05) than at least two of the four treatments with glycine-N. However, for all species, differences in total N among treatments with a mixture of glycine-N and NH4+-N were mostly not significant. The contribution of N derived from glycine-N to plant total N content for all species increased with increasing glycine-N:NH4+-N ratio in the treatment solution. These results indicated that agricultural plants could effectively use organic nitrogen from organic nitrogen sources (e.g., glycine) and from organic and inorganic N mixtures (e.g., a glycine-N and NH4+-N mix). There were also genotypic differences in glycine-N and NH4+-N uptake by agricultural species.展开更多
文摘According to Rural Poverty Al eviation Development Outline in China （2011-2020） and new impoverished population standards, key poverty-stricken coun-ties increase from 51 to 58 in Gansu, and the impoverished population from 3.00 mil ion to 13.00 mil ion, and poverty-stricken area from 16% to 80%. Meanwhile, Rural Poverty Al eviation Development Outline in China （2011-2020） describes that poverty al eviation work in China has turned from resolving subsistence issue to consolidating present achievements, speeding up casting off poverty to get rich, im-proving eco-environment and development capacity, and reducing development gap. Confronted by new tasks in the new age, it is necessary to adjust work principles, make summary and develop innovation modes, to explore development mode of poverty al eviation in rural areas in Gansu in new age.
基金1Project supported by the National Natural Science Foundation of China (No. 30370838) and the Specialized ResearchFund for the Doctoral Program of Higher Education (No. 20030335076).
文摘Seedlings of wheat (Triticum aestivum L.), Chinese cabbage (Brassica campestris L.) and mung bean (Phaseolus radiatus L.) were grown for 30 days in sterile sand media with 6 N treatments, i.e. NH4+-N, glycine-N, 3 different ratios of glycine-N:NH4+-N (NH4+-N was labeled with 15N) and a control receiving no N, to assess the importance of amino acids in excessive N nutrition along with inorganic N interactions. The contribution of nitrogen derived from glycine-N to total plant N was investigated. The total plant N of the three species treated with N was significantly greater (P < 0.05) than the control treatment. Also, seedlings from all the three species had significantly more total N as NH4+-N (P < 0.05) than at least two of the four treatments with glycine-N. However, for all species, differences in total N among treatments with a mixture of glycine-N and NH4+-N were mostly not significant. The contribution of N derived from glycine-N to plant total N content for all species increased with increasing glycine-N:NH4+-N ratio in the treatment solution. These results indicated that agricultural plants could effectively use organic nitrogen from organic nitrogen sources (e.g., glycine) and from organic and inorganic N mixtures (e.g., a glycine-N and NH4+-N mix). There were also genotypic differences in glycine-N and NH4+-N uptake by agricultural species.
