In this paper,a novel multi-frame track-before-detect algorithm is proposed,which is based on root label clustering to reduce the high computational complexity arising by observation area expansion and clutter/noise d...In this paper,a novel multi-frame track-before-detect algorithm is proposed,which is based on root label clustering to reduce the high computational complexity arising by observation area expansion and clutter/noise density increase.A criterion of track extrapolation is used to construct state transition set,root label is marked by state transition set to obtain the distribution information of multiple targets in measurement space,then measurement plots of multi-frame are divided into several clusters,and finally multi-frame track-before-detect algorithm is implemented in each cluster.The computational complexity can be reduced by employing the proposed algorithm.Simulation results show that the proposed algorithm can accurately detect multiple targets in close proximity and reduce the number of false tracks.展开更多
[Objective] The aim of this study is to establish the rapid micro-propagation system in Thesium chinense Turcz.[Method]With stem fragments of wild Thesium chinense Turcz as explants,different culture media were design...[Objective] The aim of this study is to establish the rapid micro-propagation system in Thesium chinense Turcz.[Method]With stem fragments of wild Thesium chinense Turcz as explants,different culture media were designed to conduct induction culture,strengthening plantlet culture and in vitro rooting.[Result]The optimum medium for inducing clustered shoots was determined to be MS medium appended with 1.5 mg/L 6-BA,0.01 mg/L NAA and 0.3 mg/L 2,4-D;in addition,60 mg/kg ABT was suitable for rooting,by which the percentage of rooted plantlets reached 76.6%.[Conclusion]This study simplified the procedures of tissue culture in Thesium chinense Turcz and enhanced the proliferation rate,providing basis for artificial cultivation and resource protection of Thesium chinense Turcz.展开更多
通过分析不同油茶砧木品种根系形态结构特征,为油茶砧木筛选和优化嫁接组合提供理论依据。本文选择了7个油茶砧木品种(‘XL82’‘GY12’‘GY13’‘GY14’‘EX4’‘8F-1’‘YX’),以油茶‘XL210’为接穗,测定不同砧穗组合油茶苗木的根总...通过分析不同油茶砧木品种根系形态结构特征,为油茶砧木筛选和优化嫁接组合提供理论依据。本文选择了7个油茶砧木品种(‘XL82’‘GY12’‘GY13’‘GY14’‘EX4’‘8F-1’‘YX’),以油茶‘XL210’为接穗,测定不同砧穗组合油茶苗木的根总长度、根表面积等9个根系性状指标,并运用相关分析、主成分分析和聚类分析等对砧木根系形态指标进行分析和综合评分。结果表明:不同砧穗组合油茶苗木的根系形态指标存在差异。‘EX4’的总根长、根表面积、根体积、连接数、节点数、根尖数和分叉数最大,分别为492.97 cm、117.17 cm 2、7.11 cm 3、1589.30个、1716.30个、985.00个、730.33个;‘8F-1’的分形维数最大,为1.55;‘XL82’的平均直径最大,为0.84 cm。细根(d≤2.00 mm)在总根系长度和根表面积中占比较高,‘GY12’在d≤2.00 mm径级根系长度和表面积中占比最高,‘8F-1’在d>5.00 mm径级根系长度、根表面积和根体积中占比最高。相关性分析表明,多个根系形态指标之间存在显著或极显著正相关(P<0.05或P<0.01)。主成分分析提取出2个主成分,累计贡献率达95.619%,‘EX4’综合得分最高。聚类分析将7个油茶砧木品种分为3类,‘EX4’根系形态指标值最高,‘GY12’‘8F-1’‘GY14’和‘YX’根系形态指标值中等,‘XL82’和‘GY13’形态指标值最低。聚类分析分类结果与主成分分析综合得分排名一致。‘EX4’砧木在根系形态结构特征方面表现优良,可作为油茶‘XL210’的优良砧木品种进行推广应用。展开更多
为探明具有排根的引种作物—澳洲坚果对低磷的适应特征,采用室内控制试验与山地澳洲坚果园调查验证相结合的研究方法,对澳洲坚果幼苗、大树的排根和细根在土壤中的分布特征、根系分泌物“解磷”特性及磷素利用特征进行分析。结果表明:...为探明具有排根的引种作物—澳洲坚果对低磷的适应特征,采用室内控制试验与山地澳洲坚果园调查验证相结合的研究方法,对澳洲坚果幼苗、大树的排根和细根在土壤中的分布特征、根系分泌物“解磷”特性及磷素利用特征进行分析。结果表明:室内控制试验中澳洲坚果61.80%-71.29%的排根及63.81%-82.60%的细根分布在0-40cm的土层,山地果园中澳洲坚果的排根及细根分布在0-40cm土层,80%以上的排根与细根分布于表层0-20cm的土壤,但细根在20-40cm土层中分布比例较排根多;低磷处理或不施化肥(山地果园)能促进排根产生,适度施磷处理(40mg/kg)或不施化肥(山地果园)有助于细根在表层土壤的生长,高磷处理(400mg/kg)或山地果园中长期施含磷(P 2 O 5含量15%)化肥则抑制其排根产生和细根生长;排根及细根均能大量分泌酸性磷酸酶和柠檬酸进行“解磷”,排根分泌量远大于细根,排根越多,酸性磷酸酶和柠檬酸分泌量越大;随着施磷量的升高,澳洲坚果叶片磷含量也升高,但土壤磷含量与叶片磷含量相关性较差,而不施磷处理(0mg/kg)和山地果园不施化肥条件下,澳洲坚果叶片中磷含量均在正常水平(含量为0.068%-0.071%),没有发现缺磷症状,高磷(400mg/kg)处理和长期施用“高磷”的复合化肥澳洲坚果叶片有磷中毒倾向(含量达0.11%);外源含磷复合化肥施入土壤中后,土壤中总磷含量随施入量的增加而升高,尤其山地澳洲坚果园长期施用“高磷”化肥,土壤表层(0-20cm)总磷含量高达3.59g/kg。可见,引种到本地种植的澳洲坚果,仍能适应低磷环境,但为了保障澳洲坚果经济产量,适度的外源磷投入是需要的,生产上采用叶片营养诊断法指导磷肥的施用是必要的。展开更多
基金supported by the Innovation Project of Science and Technology Commission of the Central Military Commission,China(No.19-HXXX-01-ZD-006-XXX-XX)。
文摘In this paper,a novel multi-frame track-before-detect algorithm is proposed,which is based on root label clustering to reduce the high computational complexity arising by observation area expansion and clutter/noise density increase.A criterion of track extrapolation is used to construct state transition set,root label is marked by state transition set to obtain the distribution information of multiple targets in measurement space,then measurement plots of multi-frame are divided into several clusters,and finally multi-frame track-before-detect algorithm is implemented in each cluster.The computational complexity can be reduced by employing the proposed algorithm.Simulation results show that the proposed algorithm can accurately detect multiple targets in close proximity and reduce the number of false tracks.
基金Supported by the Key Project for Supporting New Subject from Anhui Academy of Agricultural Sciences~~
文摘[Objective] The aim of this study is to establish the rapid micro-propagation system in Thesium chinense Turcz.[Method]With stem fragments of wild Thesium chinense Turcz as explants,different culture media were designed to conduct induction culture,strengthening plantlet culture and in vitro rooting.[Result]The optimum medium for inducing clustered shoots was determined to be MS medium appended with 1.5 mg/L 6-BA,0.01 mg/L NAA and 0.3 mg/L 2,4-D;in addition,60 mg/kg ABT was suitable for rooting,by which the percentage of rooted plantlets reached 76.6%.[Conclusion]This study simplified the procedures of tissue culture in Thesium chinense Turcz and enhanced the proliferation rate,providing basis for artificial cultivation and resource protection of Thesium chinense Turcz.
文摘通过分析不同油茶砧木品种根系形态结构特征,为油茶砧木筛选和优化嫁接组合提供理论依据。本文选择了7个油茶砧木品种(‘XL82’‘GY12’‘GY13’‘GY14’‘EX4’‘8F-1’‘YX’),以油茶‘XL210’为接穗,测定不同砧穗组合油茶苗木的根总长度、根表面积等9个根系性状指标,并运用相关分析、主成分分析和聚类分析等对砧木根系形态指标进行分析和综合评分。结果表明:不同砧穗组合油茶苗木的根系形态指标存在差异。‘EX4’的总根长、根表面积、根体积、连接数、节点数、根尖数和分叉数最大,分别为492.97 cm、117.17 cm 2、7.11 cm 3、1589.30个、1716.30个、985.00个、730.33个;‘8F-1’的分形维数最大,为1.55;‘XL82’的平均直径最大,为0.84 cm。细根(d≤2.00 mm)在总根系长度和根表面积中占比较高,‘GY12’在d≤2.00 mm径级根系长度和表面积中占比最高,‘8F-1’在d>5.00 mm径级根系长度、根表面积和根体积中占比最高。相关性分析表明,多个根系形态指标之间存在显著或极显著正相关(P<0.05或P<0.01)。主成分分析提取出2个主成分,累计贡献率达95.619%,‘EX4’综合得分最高。聚类分析将7个油茶砧木品种分为3类,‘EX4’根系形态指标值最高,‘GY12’‘8F-1’‘GY14’和‘YX’根系形态指标值中等,‘XL82’和‘GY13’形态指标值最低。聚类分析分类结果与主成分分析综合得分排名一致。‘EX4’砧木在根系形态结构特征方面表现优良,可作为油茶‘XL210’的优良砧木品种进行推广应用。
文摘为探明具有排根的引种作物—澳洲坚果对低磷的适应特征,采用室内控制试验与山地澳洲坚果园调查验证相结合的研究方法,对澳洲坚果幼苗、大树的排根和细根在土壤中的分布特征、根系分泌物“解磷”特性及磷素利用特征进行分析。结果表明:室内控制试验中澳洲坚果61.80%-71.29%的排根及63.81%-82.60%的细根分布在0-40cm的土层,山地果园中澳洲坚果的排根及细根分布在0-40cm土层,80%以上的排根与细根分布于表层0-20cm的土壤,但细根在20-40cm土层中分布比例较排根多;低磷处理或不施化肥(山地果园)能促进排根产生,适度施磷处理(40mg/kg)或不施化肥(山地果园)有助于细根在表层土壤的生长,高磷处理(400mg/kg)或山地果园中长期施含磷(P 2 O 5含量15%)化肥则抑制其排根产生和细根生长;排根及细根均能大量分泌酸性磷酸酶和柠檬酸进行“解磷”,排根分泌量远大于细根,排根越多,酸性磷酸酶和柠檬酸分泌量越大;随着施磷量的升高,澳洲坚果叶片磷含量也升高,但土壤磷含量与叶片磷含量相关性较差,而不施磷处理(0mg/kg)和山地果园不施化肥条件下,澳洲坚果叶片中磷含量均在正常水平(含量为0.068%-0.071%),没有发现缺磷症状,高磷(400mg/kg)处理和长期施用“高磷”的复合化肥澳洲坚果叶片有磷中毒倾向(含量达0.11%);外源含磷复合化肥施入土壤中后,土壤中总磷含量随施入量的增加而升高,尤其山地澳洲坚果园长期施用“高磷”化肥,土壤表层(0-20cm)总磷含量高达3.59g/kg。可见,引种到本地种植的澳洲坚果,仍能适应低磷环境,但为了保障澳洲坚果经济产量,适度的外源磷投入是需要的,生产上采用叶片营养诊断法指导磷肥的施用是必要的。
