The corn canopy taking in before and after grazing term in the production mode of"cornfield goose"was used as the research object.Hyperspectral techniques were used to analyze the spectral characteristics of...The corn canopy taking in before and after grazing term in the production mode of"cornfield goose"was used as the research object.Hyperspectral techniques were used to analyze the spectral characteristics of corn canopy leaves in different periods,and a full-band based Principal Component Regression model,Partial Least Squares Regression model and Support Vector Machine regression model were established to propose a fast,convenient and efficient hyperspectral imaging detection technique.The results showed that the nitrogen value of the grazing area was always lower than that of the control area,during the grazing period,the reflectance of the near-infrared spectrum increased,and the red edge position moved to the left.In terms of model establishment,the optimal model was obtained for different grazing periods.The positive set determining coefficient(Rc 2),the root-mean-square error correction(RMSEC),the prediction set decision coefficient(Rp 2)and the root-mean-square error prediction(RMSEP)were obtained by using SNV-BICA-PCA-PLS in the pre-grazing period.Their values were 0.9136,0.1750,0.8910 and 0.1052,respectively.The values of Rc 2,RMSEC,Rp 2 and RMSEP were 0.9006,0.0418,0.8508 and 0.1233,respectively,when they were obtained by using MSC-BICA-PCA-MSC in the post-grazing period.The research results provided support and help for the future"agriculture and animal husbandry integration"to optimize production management and establish a nitrogen nutrient balance model.展开更多
Human food consists of 2 major parts: plants and animals. Primitive people collected food by fishing,hunting and gathering,and later they developed primitive agriculture and animal husbandry about near to 10 thousand ...Human food consists of 2 major parts: plants and animals. Primitive people collected food by fishing,hunting and gathering,and later they developed primitive agriculture and animal husbandry about near to 10 thousand years ago. Due to different natural conditions,the distribution of plants,wild animals which were suitable for domestication are unbalanced in the world; therefore species of domesticated crops and animals vary throughout the world,which leads to the differences in the food patterns of human society. The Great Discovery of Geography ushered in the ear of exchanges among people,one of which is the exchange in agriculture. Crops from America were introduced to the old continent while poultry and livestock of the old continent were also brought to America; later,domesticated crops and animals were spread to the newly-discovered Oceania. Since then,the differences in people's food pattern have begun to narrowdown and started on the path to convergence,and the whole process is basically a saddle-shaped development.展开更多
旨在客观遴选2024年度具有影响力和前瞻性的全球农业研究热点前沿,揭示农业研究热点前沿发展趋势,洞察全球农业研究热点前沿国家和机构竞争格局,分析中国农业研究热点前沿发展的优劣势,为推动完善中国农业科技创新发展战略提供数据支撑...旨在客观遴选2024年度具有影响力和前瞻性的全球农业研究热点前沿,揭示农业研究热点前沿发展趋势,洞察全球农业研究热点前沿国家和机构竞争格局,分析中国农业研究热点前沿发展的优劣势,为推动完善中国农业科技创新发展战略提供数据支撑。以Web of Science平台SCI论文、CSCD论文以及EI论文数据(2019—2023年)为基础,遴选2024年农业9大学科76个农业研究热点,其中13个研究热点最具前瞻性,被确定为农业研究前沿。展开更多
基金Supported by the National "863" Project(AA2013102303)Heilongjiang Natural Science Foundation Project(C2015006)+3 种基金Tibet Science and Technology Department Project(XZ201703-GC-11)National Key R&D Program of China(2018YFD0201004)China Postdoctoral Fund(2016M601406)Key Cultivation Project of Lingnan Normal University in 2019(LZ1903)
文摘The corn canopy taking in before and after grazing term in the production mode of"cornfield goose"was used as the research object.Hyperspectral techniques were used to analyze the spectral characteristics of corn canopy leaves in different periods,and a full-band based Principal Component Regression model,Partial Least Squares Regression model and Support Vector Machine regression model were established to propose a fast,convenient and efficient hyperspectral imaging detection technique.The results showed that the nitrogen value of the grazing area was always lower than that of the control area,during the grazing period,the reflectance of the near-infrared spectrum increased,and the red edge position moved to the left.In terms of model establishment,the optimal model was obtained for different grazing periods.The positive set determining coefficient(Rc 2),the root-mean-square error correction(RMSEC),the prediction set decision coefficient(Rp 2)and the root-mean-square error prediction(RMSEP)were obtained by using SNV-BICA-PCA-PLS in the pre-grazing period.Their values were 0.9136,0.1750,0.8910 and 0.1052,respectively.The values of Rc 2,RMSEC,Rp 2 and RMSEP were 0.9006,0.0418,0.8508 and 0.1233,respectively,when they were obtained by using MSC-BICA-PCA-MSC in the post-grazing period.The research results provided support and help for the future"agriculture and animal husbandry integration"to optimize production management and establish a nitrogen nutrient balance model.
文摘Human food consists of 2 major parts: plants and animals. Primitive people collected food by fishing,hunting and gathering,and later they developed primitive agriculture and animal husbandry about near to 10 thousand years ago. Due to different natural conditions,the distribution of plants,wild animals which were suitable for domestication are unbalanced in the world; therefore species of domesticated crops and animals vary throughout the world,which leads to the differences in the food patterns of human society. The Great Discovery of Geography ushered in the ear of exchanges among people,one of which is the exchange in agriculture. Crops from America were introduced to the old continent while poultry and livestock of the old continent were also brought to America; later,domesticated crops and animals were spread to the newly-discovered Oceania. Since then,the differences in people's food pattern have begun to narrowdown and started on the path to convergence,and the whole process is basically a saddle-shaped development.
文摘旨在客观遴选2024年度具有影响力和前瞻性的全球农业研究热点前沿,揭示农业研究热点前沿发展趋势,洞察全球农业研究热点前沿国家和机构竞争格局,分析中国农业研究热点前沿发展的优劣势,为推动完善中国农业科技创新发展战略提供数据支撑。以Web of Science平台SCI论文、CSCD论文以及EI论文数据(2019—2023年)为基础,遴选2024年农业9大学科76个农业研究热点,其中13个研究热点最具前瞻性,被确定为农业研究前沿。
