ln the context of comprehensively deepening the reform, and integration of three The first, second and third industry sectors in rural areas, the research took major grain-producing areas in Hubei as an example, analy...ln the context of comprehensively deepening the reform, and integration of three The first, second and third industry sectors in rural areas, the research took major grain-producing areas in Hubei as an example, analyzed dominant grain in-dustrialization models “leading grain enterprises＋farmers”, and revealed its character-istics, advantages, and approaches for function reinforcement. The research is so meaningful, practical y or in future.展开更多
The study has examined the tempo-spatial patterns of cultivated land use change in Jiangsu province. A principal component analysis （PCA） of 18 selected indicators of cultivated land use during the period 1970-2010 ...The study has examined the tempo-spatial patterns of cultivated land use change in Jiangsu province. A principal component analysis （PCA） of 18 selected indicators of cultivated land use during the period 1970-2010 identified 2 main pat- terns of change in planting productivity and economic efficiency. A major shift from production-centered pattern to profit-oriented one occurred in 1984, the time of grain yield surplus and the mitigation of population pressure. In response to the impending Opened Market System, there was a notable tendency of higher efficiency and less productivity since 1997, as well as remarkable regional disparity of cultivated land use change spatially. It revealed a relative decrease in grain cropping share, crop- ping scale and cultivation intensity in South Jiangsu, especially in Tai-Lake region, and the reverse in North Jiangsu. Some suggestions for the future were finally dis- cussed from the above findings.展开更多
With the increase of global population,grain-population relationship has attracted great attention worldwide.In China,grain-population relationship has become an increasingly important economic concern.Of central impo...With the increase of global population,grain-population relationship has attracted great attention worldwide.In China,grain-population relationship has become an increasingly important economic concern.Of central importance to the food security debate in China is the geography of grain supply and demand.This paper uses a grain demand and supply index (DSR) to analyze the spatial-temporal relationship between population and grain in China from 1949 to 2007 at national and provincial scales.The results are examined in three periods.(1) From 1949 to 2007,with the increase of grain production,the relationship between population and grain of China improved considerably.(2) Over the past 35 years (1970-2005),on the whole the grain producing areas have had grain surplus and contributed to the nation by providing grain,but the ability to provide sufficient grain is not stable.(3) Over the past 15 years (1990-2005),decreases in planting area brought pressure on national grain food security.The paper concludes that the key to providing more food for the main food producing provinces is increasing yield on the basis of steady plant area.展开更多
The Asiatic Dioscorea alata yam species is an important food crop, especially in Cote d＇lvoire. It has high yield and stores longer than Dioscorea cayenensis/rotundata yam and therefore fills the hunger gap created w...The Asiatic Dioscorea alata yam species is an important food crop, especially in Cote d＇lvoire. It has high yield and stores longer than Dioscorea cayenensis/rotundata yam and therefore fills the hunger gap created when other yam types arc not available. However, very little research has been done on it. Several cultivars are susceptible to pests and diseases and lack the aesthetic values of smooth skin and elegant tuber shape ofDioscorea rotundata that appeal to consumers in the market. This study therefore sought to establish the genetic variability and relationships among 35 accessions of Ghanaian Dioscorea alata together with 14 accessions introduced from International Institute of Tropical Agriculture in Nigeria. Morphological variation was studied to establish genetic relationship among 49 accessions assembled as Dioscorea alata in Ghana. Principal component analysis （PCA） indicated that the first two principal components accounted for 25.27% of total variation from accessions with PCA1 and PCA2, contributing 13.92% and 11.35%, respectively. Cluster analysis performed clearly separated the 49 accessions into three main groupings using unweighted neighbour-joining method. Morphological descriptors were able to group the accessions into distinct clusters independent of place of collection.展开更多
文摘ln the context of comprehensively deepening the reform, and integration of three The first, second and third industry sectors in rural areas, the research took major grain-producing areas in Hubei as an example, analyzed dominant grain in-dustrialization models “leading grain enterprises＋farmers”, and revealed its character-istics, advantages, and approaches for function reinforcement. The research is so meaningful, practical y or in future.
基金Supported by A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions(PAPD)~~
文摘The study has examined the tempo-spatial patterns of cultivated land use change in Jiangsu province. A principal component analysis （PCA） of 18 selected indicators of cultivated land use during the period 1970-2010 identified 2 main pat- terns of change in planting productivity and economic efficiency. A major shift from production-centered pattern to profit-oriented one occurred in 1984, the time of grain yield surplus and the mitigation of population pressure. In response to the impending Opened Market System, there was a notable tendency of higher efficiency and less productivity since 1997, as well as remarkable regional disparity of cultivated land use change spatially. It revealed a relative decrease in grain cropping share, crop- ping scale and cultivation intensity in South Jiangsu, especially in Tai-Lake region, and the reverse in North Jiangsu. Some suggestions for the future were finally dis- cussed from the above findings.
基金financial support from Education Bureau of Shandong for the research as visiting scholar in the University of Sydney
文摘With the increase of global population,grain-population relationship has attracted great attention worldwide.In China,grain-population relationship has become an increasingly important economic concern.Of central importance to the food security debate in China is the geography of grain supply and demand.This paper uses a grain demand and supply index (DSR) to analyze the spatial-temporal relationship between population and grain in China from 1949 to 2007 at national and provincial scales.The results are examined in three periods.(1) From 1949 to 2007,with the increase of grain production,the relationship between population and grain of China improved considerably.(2) Over the past 35 years (1970-2005),on the whole the grain producing areas have had grain surplus and contributed to the nation by providing grain,but the ability to provide sufficient grain is not stable.(3) Over the past 15 years (1990-2005),decreases in planting area brought pressure on national grain food security.The paper concludes that the key to providing more food for the main food producing provinces is increasing yield on the basis of steady plant area.
文摘The Asiatic Dioscorea alata yam species is an important food crop, especially in Cote d＇lvoire. It has high yield and stores longer than Dioscorea cayenensis/rotundata yam and therefore fills the hunger gap created when other yam types arc not available. However, very little research has been done on it. Several cultivars are susceptible to pests and diseases and lack the aesthetic values of smooth skin and elegant tuber shape ofDioscorea rotundata that appeal to consumers in the market. This study therefore sought to establish the genetic variability and relationships among 35 accessions of Ghanaian Dioscorea alata together with 14 accessions introduced from International Institute of Tropical Agriculture in Nigeria. Morphological variation was studied to establish genetic relationship among 49 accessions assembled as Dioscorea alata in Ghana. Principal component analysis （PCA） indicated that the first two principal components accounted for 25.27% of total variation from accessions with PCA1 and PCA2, contributing 13.92% and 11.35%, respectively. Cluster analysis performed clearly separated the 49 accessions into three main groupings using unweighted neighbour-joining method. Morphological descriptors were able to group the accessions into distinct clusters independent of place of collection.
