In order to explore the effect of Fenlong cultivation in rebuilding and uti- lization of saline-alkali land, the Fenlong tillage machine and Fenlong technology were invented and put into tests in the saline-alkali lan...In order to explore the effect of Fenlong cultivation in rebuilding and uti- lization of saline-alkali land, the Fenlong tillage machine and Fenlong technology were invented and put into tests in the saline-alkali land from 2015-2016 in Xinjiang Autonomous Region and Shaanxi province, respectively. The results showed that in Xinjiang, the total salt content in the heavy saline-alkali soil decreased by 31.31% after one season of cotton planting using Fenlong, while cotton yield increased by 48.80%, and the soil salinity level was fallen from ＂severe＂ to ＂moderate＂ level. In Shaanxi, the total salt content in decreased by 42.73% after planting summer corn summer corn the mild saline-alkali land using Fenlong cultivation, while the corn yield increased by 34.83%, and the soil salinity degree was changed from ＂mild de- salination＂ to ＂normal farmland＂. At last, the paper provided the mechanism and reasons for desalination in soil and yield increase by Fenlong cultivation.展开更多
The Qaidam Basin （NW China） at the northern margin of the Tibetan Plateau is one of the driest places on Earth with mean annual precipitation not exceeding 25 mm in the western central part. Flat salt plains and win...The Qaidam Basin （NW China） at the northern margin of the Tibetan Plateau is one of the driest places on Earth with mean annual precipitation not exceeding 25 mm in the western central part. Flat salt plains and wind-shaped hills characterise the bare ground over thousands of square kilometres. In contrast to presentday conditions, remnants of ancient shorelines in high positions identified by Chen and Bowler （1986） and HiJvermann and Siissenberger （1986） about 20 years ago herald of a former large lake but were not investigated further till now. Here we present the results of microfossil analysis and optically stimulated luminescence （OSL） as well as uranium-series （TIMS） dating of sediments from a thick sequence of predominantly lake deposits in the eastern central Qaidam Basin. Based on abundant ostracod （micro-crustacean） shells from this sequence, we infer that a large lake of several metres depth at least maintained primarily fresh to oligohaline conditions in the late Middle Pleistocene.展开更多
A vertical tubular desalination unit with shell and tube structure was built to perform humidification and dehumidification simultaneously on the tube and shell side of the column, respectively. The effects of several...A vertical tubular desalination unit with shell and tube structure was built to perform humidification and dehumidification simultaneously on the tube and shell side of the column, respectively. The effects of several operating conditions on the productivity and thermal efficiency of the column were investigated. The results show that both the productivity and thermal efficiency of the column enhance with the elevation of the inlet water temperature. The flow rates of water and carrier gas both have optimal operating ranges, which are 10-30 kg·h^-1 and 4-7kg·h^-1 for the present column, respectively. Meanwhile, the increase of external steam flow rate will promote the productivity of the column but reduce its thermal efficiency.展开更多
The main aim of this work was to investigate the effects of salt stress conditions on the inorganic and organic compounds of extracts from six filamentous cyanobacteria： Arthospira platensis, Oscillatoria sp., Oscill...The main aim of this work was to investigate the effects of salt stress conditions on the inorganic and organic compounds of extracts from six filamentous cyanobacteria： Arthospira platensis, Oscillatoria sp., Oscillatoria salina, Tolypothrix sp., Oscillatoria sp. SWU （Srinakharinwirot University）121 and Tolypothrix sp. SWU213. All cyanobacteria were cultures in BG （blue-green algae）11 medium： pH 7.5 at 35 ℃ for 30 days of sodium chloride in the culture medium presented 0-1.0 M. The cyanobacteria isolates grew well in BGH medium, nevertheless, growth of the majority of isolates was reduced by about 50% in the same medium containing 0.5 M NaCl. The inorganic compounds such as, Na^＋, K^＋, Ca^2＋, Mg^2＋, NH4^＋ and NO3^- were determined. All ions were reduced when NaCI was increased and Na^＋ showed highest amount in the medium followed with Mg^2＋, NH4^＋, NO3^- and Ca^2＋ in all cyanobaeteria. The organic compounds such as, betaine, proline and total lipid were determined under normal and salt stress conditions. We found that all cyanobacteria increased interesting organic compound under salt stress condition at least two folds to compare with normal condition. This is the first finding indicated that freshwater filamentous cyanobacteria could grow under salt stresses by accumulation of some organic compounds as osmoprotectants such as betaine and amino acids, being the reduction related to the amount of inorganies compounds present in cultures.展开更多
The distributional features of sea surface temperature and salinity (SST and SSS)in the Taiwan Straits have been analyzed using the SST and SSS underway measurements in August, 1999. The characteristics of SST and SSS...The distributional features of sea surface temperature and salinity (SST and SSS)in the Taiwan Straits have been analyzed using the SST and SSS underway measurements in August, 1999. The characteristics of SST and SSS are summarized as follows: There are several upwellings and diluted water in the Taiwan Straits. The upwellings are divided into two kinds: those along the western coast of the Taiwan Straits and those around the Taiwan Shoal. There are three sources of diluted water: diluted water of the Jiulongjiang River,diluted water of the Zhujiang River and diluted water of the Minjiang River.展开更多
The community structure of adult mosquitoes was compared from New Jerseylight trap collections in six different types of habitats in Citrus County, Florida, USA. FromOctober 1998 to December 2000, mosquitoes were coll...The community structure of adult mosquitoes was compared from New Jerseylight trap collections in six different types of habitats in Citrus County, Florida, USA. FromOctober 1998 to December 2000, mosquitoes were collected three times a week from the followinghabitats (swamps, swamps and freshwater marshes, pine flatwoods, pine flatwoods and scrub, saltmarshes, and salt marshes and mangroves). Mosquito density was highest in the swamps and freshwatermarshes habitat, with an average of 95.65 specimens per trap. Density was lowest in the flatwoodsand scrub habitat, with an average of 14.38 specimens per trap. Species dominance differed amonghabitats. Salt marshes produced the greatest aggregation index, while pine flatwoods produced thelowest. Conversely, diversity analysis showed that pine flatwoods had the greatest diversity, whilesalt marshes the lowest diversity. Similarity indices indicated that the adult mosquito communitiesfrom pine flatwoods and pine flatwoods and scrub were very similar (0.8583). The adult mosquitocommunity of salt marshes was different from that of swamps and freshwater marshes (the similarindex was 0.0217).展开更多
文摘In order to explore the effect of Fenlong cultivation in rebuilding and uti- lization of saline-alkali land, the Fenlong tillage machine and Fenlong technology were invented and put into tests in the saline-alkali land from 2015-2016 in Xinjiang Autonomous Region and Shaanxi province, respectively. The results showed that in Xinjiang, the total salt content in the heavy saline-alkali soil decreased by 31.31% after one season of cotton planting using Fenlong, while cotton yield increased by 48.80%, and the soil salinity level was fallen from ＂severe＂ to ＂moderate＂ level. In Shaanxi, the total salt content in decreased by 42.73% after planting summer corn summer corn the mild saline-alkali land using Fenlong cultivation, while the corn yield increased by 34.83%, and the soil salinity degree was changed from ＂mild de- salination＂ to ＂normal farmland＂. At last, the paper provided the mechanism and reasons for desalination in soil and yield increase by Fenlong cultivation.
文摘The Qaidam Basin （NW China） at the northern margin of the Tibetan Plateau is one of the driest places on Earth with mean annual precipitation not exceeding 25 mm in the western central part. Flat salt plains and wind-shaped hills characterise the bare ground over thousands of square kilometres. In contrast to presentday conditions, remnants of ancient shorelines in high positions identified by Chen and Bowler （1986） and HiJvermann and Siissenberger （1986） about 20 years ago herald of a former large lake but were not investigated further till now. Here we present the results of microfossil analysis and optically stimulated luminescence （OSL） as well as uranium-series （TIMS） dating of sediments from a thick sequence of predominantly lake deposits in the eastern central Qaidam Basin. Based on abundant ostracod （micro-crustacean） shells from this sequence, we infer that a large lake of several metres depth at least maintained primarily fresh to oligohaline conditions in the late Middle Pleistocene.
基金Supported by the National Natural Science Foundation of China China Energy Conservation Investment Corporation as a key project (No. 20236030).
文摘A vertical tubular desalination unit with shell and tube structure was built to perform humidification and dehumidification simultaneously on the tube and shell side of the column, respectively. The effects of several operating conditions on the productivity and thermal efficiency of the column were investigated. The results show that both the productivity and thermal efficiency of the column enhance with the elevation of the inlet water temperature. The flow rates of water and carrier gas both have optimal operating ranges, which are 10-30 kg·h^-1 and 4-7kg·h^-1 for the present column, respectively. Meanwhile, the increase of external steam flow rate will promote the productivity of the column but reduce its thermal efficiency.
文摘The main aim of this work was to investigate the effects of salt stress conditions on the inorganic and organic compounds of extracts from six filamentous cyanobacteria： Arthospira platensis, Oscillatoria sp., Oscillatoria salina, Tolypothrix sp., Oscillatoria sp. SWU （Srinakharinwirot University）121 and Tolypothrix sp. SWU213. All cyanobacteria were cultures in BG （blue-green algae）11 medium： pH 7.5 at 35 ℃ for 30 days of sodium chloride in the culture medium presented 0-1.0 M. The cyanobacteria isolates grew well in BGH medium, nevertheless, growth of the majority of isolates was reduced by about 50% in the same medium containing 0.5 M NaCl. The inorganic compounds such as, Na^＋, K^＋, Ca^2＋, Mg^2＋, NH4^＋ and NO3^- were determined. All ions were reduced when NaCI was increased and Na^＋ showed highest amount in the medium followed with Mg^2＋, NH4^＋, NO3^- and Ca^2＋ in all cyanobaeteria. The organic compounds such as, betaine, proline and total lipid were determined under normal and salt stress conditions. We found that all cyanobacteria increased interesting organic compound under salt stress condition at least two folds to compare with normal condition. This is the first finding indicated that freshwater filamentous cyanobacteria could grow under salt stresses by accumulation of some organic compounds as osmoprotectants such as betaine and amino acids, being the reduction related to the amount of inorganies compounds present in cultures.
基金This projecy was supported by Project (98-Z-179) of Fujian Province and Project (49636220) of the NSFC
文摘The distributional features of sea surface temperature and salinity (SST and SSS)in the Taiwan Straits have been analyzed using the SST and SSS underway measurements in August, 1999. The characteristics of SST and SSS are summarized as follows: There are several upwellings and diluted water in the Taiwan Straits. The upwellings are divided into two kinds: those along the western coast of the Taiwan Straits and those around the Taiwan Shoal. There are three sources of diluted water: diluted water of the Jiulongjiang River,diluted water of the Zhujiang River and diluted water of the Minjiang River.
文摘The community structure of adult mosquitoes was compared from New Jerseylight trap collections in six different types of habitats in Citrus County, Florida, USA. FromOctober 1998 to December 2000, mosquitoes were collected three times a week from the followinghabitats (swamps, swamps and freshwater marshes, pine flatwoods, pine flatwoods and scrub, saltmarshes, and salt marshes and mangroves). Mosquito density was highest in the swamps and freshwatermarshes habitat, with an average of 95.65 specimens per trap. Density was lowest in the flatwoodsand scrub habitat, with an average of 14.38 specimens per trap. Species dominance differed amonghabitats. Salt marshes produced the greatest aggregation index, while pine flatwoods produced thelowest. Conversely, diversity analysis showed that pine flatwoods had the greatest diversity, whilesalt marshes the lowest diversity. Similarity indices indicated that the adult mosquito communitiesfrom pine flatwoods and pine flatwoods and scrub were very similar (0.8583). The adult mosquitocommunity of salt marshes was different from that of swamps and freshwater marshes (the similarindex was 0.0217).
