As an important part of land use/cover change(LUCC), historical LUCC in long time series attracts much more attention from scholars. Currently, based on the view of combining the overall control of cropland area and ...As an important part of land use/cover change(LUCC), historical LUCC in long time series attracts much more attention from scholars. Currently, based on the view of combining the overall control of cropland area and ′top-down′ decision-making behaviors, here are two global historical land-use datasets, generally referred as the Sustainability and the Global Environment datasets(SAGE datasets) and History Database of the Global Environment datasets(HYDE datasets). However, at the regional level, these global datasets have coarse resolutions and inevitable errors. Considering various factors that influenced cropland distribution, including cropland connectivity and the limitation of natural and human factors, this study developed a reconstruction model of historical cropland based on constrained Cellular Automaton(CA) of ′bottom-up′. Then, an available labor force index is used as a proxy for the amount of cropland to inspect and calibrate these spatial patterns. Applied the reconstruction model to Shandong Province, we reconstructed its spatial distribution of cropland during 8 periods. The reconstructed results show that: 1) it is properly suitable for constrained CA to simulate and reconstruct the spatial distribution of cropland in traditional cultivated region of China; 2) compared with ′SAGE datasets′ and ′HYDE datasets′, this study have formed higher-resolution Boolean spatial distribution datasets of historical cropland with a more definitive concept of spatial pattern in terms of fractional format.展开更多
[Objective] The aim was to explore a suitable cultivation approach for cassava in Hunan province. [Method] With SC9(Southern China 9) as test materials, the test included four treatment methods, as follows: control gr...[Objective] The aim was to explore a suitable cultivation approach for cassava in Hunan province. [Method] With SC9(Southern China 9) as test materials, the test included four treatment methods, as follows: control group by traditional cultivation with crops uncovered(CK), treatment 1 by traditional cultivation with mulch coverage, treatment 2 by powder ridge cultivation with crops uncovered, and treatment 3 by powder ridge cultivation with mulch coverage. Water and fertilizer managements were kept the same. [Result] Compared with traditional cultivation(CK), the treatment by powder ridge cultivation with mulch coverage performed better. Specifically, yield per unit area reached 44 790 kg/hm2, increasing by 86.38%(20 760 kg/hm2) than that of control; starch content grew by 17.24%. The cultivation method considerably improved cassava yield and quality. [Conclusion] Powder ridge cultivation with mulch coverage is a cultivation approach suitable for cassava in Hunan province.展开更多
Poaceae species such as silver grass or reed are commonly used in traditional mulch farming in Japan,where the Nishi-Awa area is a Globally Important Agricultural Heritage Systems(GIAHS)site.Farmers here have traditio...Poaceae species such as silver grass or reed are commonly used in traditional mulch farming in Japan,where the Nishi-Awa area is a Globally Important Agricultural Heritage Systems(GIAHS)site.Farmers here have traditionally used silver grass for mulch farming;furthermore,local farmers have learned from long-standing experience that Japanese knotweed(Fallopia japonica,Polygonaceae)is better for cultivation of solanaceous crops in this area.However,it is unclear why Japanese knotweed mulching is beneficial for cultivation of solanaceous crops.Thus,in this study,we hypothesized that Japanese knotweed mulching may be effective in avoiding hazards associated with continuous potato cropping,as native potato used to be cultivated twice a year in the past.Therefore,we investigated the effects of Japanese knotweed mulching on continuous potato cropping and after tomato cropping,which is another solanaceous crop species.Field experiments were conducted in 2018.First,we compared Japanese knotweed mulching,silver grass mulching and no grass mulching(control)in a soil under continuous potato cultivation and in an uncultivated soil.As a result,the extent of the potato yield decrease was reduced by Japanese knotweed mulching.Secondly,we compared Japanese knotweed-mulching and no grass mulching in a soil after a tomato crop and in an uncultivated soil.The extent of decrease in potato growth and yield was also reduced by Japanese knotweed mulching.These findings indicate that mulching with Japanese knotweed helped to avoid the risks associated with continuous potato cropping.展开更多
基金Under the auspices of National Basic Research Program of China(No.2011CB952001)National Natural Science Foundation of China(No.41340016,412013860)
文摘As an important part of land use/cover change(LUCC), historical LUCC in long time series attracts much more attention from scholars. Currently, based on the view of combining the overall control of cropland area and ′top-down′ decision-making behaviors, here are two global historical land-use datasets, generally referred as the Sustainability and the Global Environment datasets(SAGE datasets) and History Database of the Global Environment datasets(HYDE datasets). However, at the regional level, these global datasets have coarse resolutions and inevitable errors. Considering various factors that influenced cropland distribution, including cropland connectivity and the limitation of natural and human factors, this study developed a reconstruction model of historical cropland based on constrained Cellular Automaton(CA) of ′bottom-up′. Then, an available labor force index is used as a proxy for the amount of cropland to inspect and calibrate these spatial patterns. Applied the reconstruction model to Shandong Province, we reconstructed its spatial distribution of cropland during 8 periods. The reconstructed results show that: 1) it is properly suitable for constrained CA to simulate and reconstruct the spatial distribution of cropland in traditional cultivated region of China; 2) compared with ′SAGE datasets′ and ′HYDE datasets′, this study have formed higher-resolution Boolean spatial distribution datasets of historical cropland with a more definitive concept of spatial pattern in terms of fractional format.
基金Supported by the Earmarked Fund for China Agriculture Research System(CARS-12cssy)
文摘[Objective] The aim was to explore a suitable cultivation approach for cassava in Hunan province. [Method] With SC9(Southern China 9) as test materials, the test included four treatment methods, as follows: control group by traditional cultivation with crops uncovered(CK), treatment 1 by traditional cultivation with mulch coverage, treatment 2 by powder ridge cultivation with crops uncovered, and treatment 3 by powder ridge cultivation with mulch coverage. Water and fertilizer managements were kept the same. [Result] Compared with traditional cultivation(CK), the treatment by powder ridge cultivation with mulch coverage performed better. Specifically, yield per unit area reached 44 790 kg/hm2, increasing by 86.38%(20 760 kg/hm2) than that of control; starch content grew by 17.24%. The cultivation method considerably improved cassava yield and quality. [Conclusion] Powder ridge cultivation with mulch coverage is a cultivation approach suitable for cassava in Hunan province.
文摘Poaceae species such as silver grass or reed are commonly used in traditional mulch farming in Japan,where the Nishi-Awa area is a Globally Important Agricultural Heritage Systems(GIAHS)site.Farmers here have traditionally used silver grass for mulch farming;furthermore,local farmers have learned from long-standing experience that Japanese knotweed(Fallopia japonica,Polygonaceae)is better for cultivation of solanaceous crops in this area.However,it is unclear why Japanese knotweed mulching is beneficial for cultivation of solanaceous crops.Thus,in this study,we hypothesized that Japanese knotweed mulching may be effective in avoiding hazards associated with continuous potato cropping,as native potato used to be cultivated twice a year in the past.Therefore,we investigated the effects of Japanese knotweed mulching on continuous potato cropping and after tomato cropping,which is another solanaceous crop species.Field experiments were conducted in 2018.First,we compared Japanese knotweed mulching,silver grass mulching and no grass mulching(control)in a soil under continuous potato cultivation and in an uncultivated soil.As a result,the extent of the potato yield decrease was reduced by Japanese knotweed mulching.Secondly,we compared Japanese knotweed-mulching and no grass mulching in a soil after a tomato crop and in an uncultivated soil.The extent of decrease in potato growth and yield was also reduced by Japanese knotweed mulching.These findings indicate that mulching with Japanese knotweed helped to avoid the risks associated with continuous potato cropping.
