Field experiments were carried out to study the effects of plastic film mulching on soil physical characters, including soil temperature, soil moisture content and soil bulk density, and yield and yield components of ...Field experiments were carried out to study the effects of plastic film mulching on soil physical characters, including soil temperature, soil moisture content and soil bulk density, and yield and yield components of sweet potato. The results showed that plastic filming mulching increased soil temperature. Considering the soil temperature-increasing effect, the treatments ranked as black plastic film treatment 〉 white plastic film treatment 〉 control. However, with the deepening of soil layer, the warming effect of plastic film mulching was weakened. Black or white plastic film mulching was conducive to low T/R value, especially in the early growth stage of sweet potato. Plastic film mulching significantly improved the storage root yield of sweet potato. In terms of yield-improving effect, the treatments ranked as black plastic film treatment 〉 white plastic film treatment 〉 control. The storage root num- ber per plant showed a downward trend, but the weight of single storage root was increased.展开更多
Due to the deficiency of sliding Lagrange polynomial interpolation, the author proposes a new interpolation method, which considers the physical character of satellite movement in coordinate transformation and reasona...Due to the deficiency of sliding Lagrange polynomial interpolation, the author proposes a new interpolation method, which considers the physical character of satellite movement in coordinate transformation and reasonable selection of interpolation function. Precision of the two methods is compared by a numerical example. The result shows that the new method is superior to the sliding Lagrange polynomial interpolation in interpolation and extrapolation, especially in extrapolation that is over short time spans.展开更多
The features of physical geography in the transitional region between Qinling Mountains and Huanghuai Plain possess transitional characters evidently in two directions: one is from the western mountain to the eastern ...The features of physical geography in the transitional region between Qinling Mountains and Huanghuai Plain possess transitional characters evidently in two directions: one is from the western mountain to the eastern plain and the other is from southern subtropical zone to northern temperate zone. Torrential rain, especially strong torrential rain is frequent in the transitional region, and there are many torrential rain centers. A majority of torrential rain is distributed among 100-200 m asl. The winter temperature at 100-400 m asl is higher than that in Huanghuai Plain whose altitude is lower than that of the transitional region, and the highest temperature in January appears at 350-400 m asl.The thickness of warm slope belt in the transitional region varies from 100 m to 250 m asl. The formation of torrential rain and warm slope belt is the result of joint action of atmospheric circulation and local terrain. Frequent torrential rains and warm slope belt had tremendous influences on the soil properties, plant distribution and local climate in the transitional region.展开更多
Being as an example of Fuxin, gangue abandoned place was classified gangue hill and dump. It was built 68 piece of temporary standard fields, which physical and chemical character of soil were researched and analyzed....Being as an example of Fuxin, gangue abandoned place was classified gangue hill and dump. It was built 68 piece of temporary standard fields, which physical and chemical character of soil were researched and analyzed. The quality of district site was estimated, and five type abandoned place were gotten. Stopping draining cash less than 7 a and draining cash gangue hill was regarded as I gangue hill. Stopping draining gangue age limit 7-15 a and herbage abundance being COlp level was regarded as II gangue hill. Stopping draining gangue age limit 15-25 a and herbage abundance CO2p level was regarded as III gangue hill. Stopping draining cash gangue age limit over 25 a and herbage abundance CO3p level was regarded as IV gangue hill. Dump being formed the underground layer dug up and stacked in the course of mining was regarded asVgangue hill. The results show that every typical abandoned place can plant vegetable.展开更多
基金Supported by National Sweet Potato Industrial Technology System(CARS-11-C-16)~~
文摘Field experiments were carried out to study the effects of plastic film mulching on soil physical characters, including soil temperature, soil moisture content and soil bulk density, and yield and yield components of sweet potato. The results showed that plastic filming mulching increased soil temperature. Considering the soil temperature-increasing effect, the treatments ranked as black plastic film treatment 〉 white plastic film treatment 〉 control. However, with the deepening of soil layer, the warming effect of plastic film mulching was weakened. Black or white plastic film mulching was conducive to low T/R value, especially in the early growth stage of sweet potato. Plastic film mulching significantly improved the storage root yield of sweet potato. In terms of yield-improving effect, the treatments ranked as black plastic film treatment 〉 white plastic film treatment 〉 control. The storage root num- ber per plant showed a downward trend, but the weight of single storage root was increased.
基金supported by the PhD Excellence Fund of Information Engineering University(S201307)
文摘Due to the deficiency of sliding Lagrange polynomial interpolation, the author proposes a new interpolation method, which considers the physical character of satellite movement in coordinate transformation and reasonable selection of interpolation function. Precision of the two methods is compared by a numerical example. The result shows that the new method is superior to the sliding Lagrange polynomial interpolation in interpolation and extrapolation, especially in extrapolation that is over short time spans.
文摘The features of physical geography in the transitional region between Qinling Mountains and Huanghuai Plain possess transitional characters evidently in two directions: one is from the western mountain to the eastern plain and the other is from southern subtropical zone to northern temperate zone. Torrential rain, especially strong torrential rain is frequent in the transitional region, and there are many torrential rain centers. A majority of torrential rain is distributed among 100-200 m asl. The winter temperature at 100-400 m asl is higher than that in Huanghuai Plain whose altitude is lower than that of the transitional region, and the highest temperature in January appears at 350-400 m asl.The thickness of warm slope belt in the transitional region varies from 100 m to 250 m asl. The formation of torrential rain and warm slope belt is the result of joint action of atmospheric circulation and local terrain. Frequent torrential rains and warm slope belt had tremendous influences on the soil properties, plant distribution and local climate in the transitional region.
文摘Being as an example of Fuxin, gangue abandoned place was classified gangue hill and dump. It was built 68 piece of temporary standard fields, which physical and chemical character of soil were researched and analyzed. The quality of district site was estimated, and five type abandoned place were gotten. Stopping draining cash less than 7 a and draining cash gangue hill was regarded as I gangue hill. Stopping draining gangue age limit 7-15 a and herbage abundance being COlp level was regarded as II gangue hill. Stopping draining gangue age limit 15-25 a and herbage abundance CO2p level was regarded as III gangue hill. Stopping draining cash gangue age limit over 25 a and herbage abundance CO3p level was regarded as IV gangue hill. Dump being formed the underground layer dug up and stacked in the course of mining was regarded asVgangue hill. The results show that every typical abandoned place can plant vegetable.
