Rice breeding for maximum yield is a hot topic today in the rice community of the world, and a hard nut to crack into the bargain. For many years, we have been devoted to the subject. In 1987 we discussed the subject ...Rice breeding for maximum yield is a hot topic today in the rice community of the world, and a hard nut to crack into the bargain. For many years, we have been devoted to the subject. In 1987 we discussed the subject in publications at home and abroad, in which we first introduced the general strategy of combining ideal plant morphology with the use of vigor. Afterward, drawing on the wisdoms of other researchers, we experimented with test materials featuring "rather short stalks" and "rather big panicles", but the results were not very satisfactory. Then, we switched from the "two rathers" to the "three optimums" (plant height, panicle size, and tillering ability). Three years’ (1991-1993) verification, especially the demonstra展开更多
Marine ranching can be regarded as a type of artificial fishery,and its construction aims at the sustainable utilisation of fishery resources.Therefore,the sustainable yield level of target species in marine ranching ...Marine ranching can be regarded as a type of artificial fishery,and its construction aims at the sustainable utilisation of fishery resources.Therefore,the sustainable yield level of target species in marine ranching has become one of the concerns of stakeholders.The enhancement surplus production model proposed by Wang(2021)based on the traditional surplus production model can be used to assess the sustainable utilisation of settled species in marine ranches.However,when the target species has the characteristics of migration inside and outside marine ranches,its sustainability assessment will be aff ected.Based on the movement range and resource density levels of enhancement species inside and outside marine ranches,we built a biomass change model that is suitable for enhancement species with migration characteristics inside and outside marine ranches(migration enhancement biomass model).Moreover,we simulated the effects of factors,such as the ratio of the movement range and the ratio of resource density within and outside marine ranches and the fishing strategy for the enhancement species in marine ranches,on the estimation of maximum sustainable yield(MSY).Results show that the large movement range of enhancement species outside marine ranches was associated with the obvious advantage of the proposed migration enhancement model over the traditional enhancement production model.A small difference in the densities of enhancement species inside and outside marine ranches was highly beneficial for improving the accuracy of MSY estimation.The migration enhancement biomass model proposed in this study provides an idea for estimating the MSY of an enhancement species that migrates inside and outside marine ranches.Researchers can adjust the parameters of the model in accordance with the actual situation of resource distribution and changes to improve the scientificity of fishery stock assessment.展开更多
The processes and characteristics of secondary electron emission in insulators and semiconductors were studied, and the formulae for the maximum yield(δ_m) at W_(pOm)≤ 800 eV and the secondary electron yield from in...The processes and characteristics of secondary electron emission in insulators and semiconductors were studied, and the formulae for the maximum yield(δ_m) at W_(pOm)≤ 800 eV and the secondary electron yield from insulators and semiconductors δ at the primary incident energy of 2 keV≤ W_(pO) < 10 keV(δ_(2-10)) and10 keV ≤ W_(pO)≤100 keV(δ_(10-100)) were deduced. The calculation results were compared with their corresponding experimental data. It is concluded that the deduced formulae can be used to calculate δ_(2-100)at W_(pOm)≤ 800 eV.展开更多
利用2个耐盐和2个盐敏感的陆地棉品种,分别设置对照和4%(40 g L–1)浓度NaCl溶液处理三叶期幼苗,处理72 h后调查盐害指数,测定地上部分鲜重、根鲜重、叶片相对含水量、叶绿素荧光参数、相对电导率、丙二醛含量、抗氧化酶类活性等13个与...利用2个耐盐和2个盐敏感的陆地棉品种,分别设置对照和4%(40 g L–1)浓度NaCl溶液处理三叶期幼苗,处理72 h后调查盐害指数,测定地上部分鲜重、根鲜重、叶片相对含水量、叶绿素荧光参数、相对电导率、丙二醛含量、抗氧化酶类活性等13个与耐盐性相关的重要指标。利用灰色关联聚类、主成分分析和逐步回归等方法综合评价陆地棉苗期耐盐性,认为最大光化学效率(Fv/Fm)可以作为鉴定陆地棉苗期耐盐性的关键指标,构建耐盐指数(y)方程y=1.943x–0.882(x=最大光化学效率),同时结合另外2个耐盐和2个盐敏感品种所得方程y值对耐盐等级进行划分。进一步利用23个已知耐盐性的品种检验方程,计算结果与田间鉴定结果完全一致。因此选用最大光化学效率作为唯一指标鉴定陆地棉苗期耐盐性,高效准确,同时通过构建方程和划分耐盐等级,为未来大规模陆地棉品种资源耐盐性鉴定提供技术标准和研究基础。展开更多
文摘Rice breeding for maximum yield is a hot topic today in the rice community of the world, and a hard nut to crack into the bargain. For many years, we have been devoted to the subject. In 1987 we discussed the subject in publications at home and abroad, in which we first introduced the general strategy of combining ideal plant morphology with the use of vigor. Afterward, drawing on the wisdoms of other researchers, we experimented with test materials featuring "rather short stalks" and "rather big panicles", but the results were not very satisfactory. Then, we switched from the "two rathers" to the "three optimums" (plant height, panicle size, and tillering ability). Three years’ (1991-1993) verification, especially the demonstra
基金Supported by the National Key Research and Development Program of China(No.2019YFD0901304)the Basic Public Welfare Research Project of Zhejiang(No.LGN21C190009)the Science and Technology Project of Zhoushan(No.2017C41012)。
文摘Marine ranching can be regarded as a type of artificial fishery,and its construction aims at the sustainable utilisation of fishery resources.Therefore,the sustainable yield level of target species in marine ranching has become one of the concerns of stakeholders.The enhancement surplus production model proposed by Wang(2021)based on the traditional surplus production model can be used to assess the sustainable utilisation of settled species in marine ranches.However,when the target species has the characteristics of migration inside and outside marine ranches,its sustainability assessment will be aff ected.Based on the movement range and resource density levels of enhancement species inside and outside marine ranches,we built a biomass change model that is suitable for enhancement species with migration characteristics inside and outside marine ranches(migration enhancement biomass model).Moreover,we simulated the effects of factors,such as the ratio of the movement range and the ratio of resource density within and outside marine ranches and the fishing strategy for the enhancement species in marine ranches,on the estimation of maximum sustainable yield(MSY).Results show that the large movement range of enhancement species outside marine ranches was associated with the obvious advantage of the proposed migration enhancement model over the traditional enhancement production model.A small difference in the densities of enhancement species inside and outside marine ranches was highly beneficial for improving the accuracy of MSY estimation.The migration enhancement biomass model proposed in this study provides an idea for estimating the MSY of an enhancement species that migrates inside and outside marine ranches.Researchers can adjust the parameters of the model in accordance with the actual situation of resource distribution and changes to improve the scientificity of fishery stock assessment.
基金supported by the National Natural Science Foundation of China(No.11473049)
文摘The processes and characteristics of secondary electron emission in insulators and semiconductors were studied, and the formulae for the maximum yield(δ_m) at W_(pOm)≤ 800 eV and the secondary electron yield from insulators and semiconductors δ at the primary incident energy of 2 keV≤ W_(pO) < 10 keV(δ_(2-10)) and10 keV ≤ W_(pO)≤100 keV(δ_(10-100)) were deduced. The calculation results were compared with their corresponding experimental data. It is concluded that the deduced formulae can be used to calculate δ_(2-100)at W_(pOm)≤ 800 eV.
基金This paper Is a summary of the work that was done on research projects sponsored by State Key Scientific Research ProgramsState Natural Science Fundation+1 种基金State Education Commiasion's Program for Ph.D.CandidatesLiaoning Provincial Science and T
文摘利用2个耐盐和2个盐敏感的陆地棉品种,分别设置对照和4%(40 g L–1)浓度NaCl溶液处理三叶期幼苗,处理72 h后调查盐害指数,测定地上部分鲜重、根鲜重、叶片相对含水量、叶绿素荧光参数、相对电导率、丙二醛含量、抗氧化酶类活性等13个与耐盐性相关的重要指标。利用灰色关联聚类、主成分分析和逐步回归等方法综合评价陆地棉苗期耐盐性,认为最大光化学效率(Fv/Fm)可以作为鉴定陆地棉苗期耐盐性的关键指标,构建耐盐指数(y)方程y=1.943x–0.882(x=最大光化学效率),同时结合另外2个耐盐和2个盐敏感品种所得方程y值对耐盐等级进行划分。进一步利用23个已知耐盐性的品种检验方程,计算结果与田间鉴定结果完全一致。因此选用最大光化学效率作为唯一指标鉴定陆地棉苗期耐盐性,高效准确,同时通过构建方程和划分耐盐等级,为未来大规模陆地棉品种资源耐盐性鉴定提供技术标准和研究基础。
