Abstract
【Objective】This study was to investigate the potential of decreasing plant for different plant species and cropping system to reduce nitrate accumulation in soil profile such as meadow cinnamon soil on North China plain.【Method】 Crop,forage,forest and catch crops were used as materials in a field experiment,the soil,plant and root samples were collected and measured,and the reduction effects of several plant cultivation systems were analyzed.【Result】 The results indicated that biomass and N uptake of grass monoculture or intercropping on the ground increased significantly with the cultivation period,and was significantly higher than crop rotation and catch crops after 2 years.Although poplar had the greatest biomass,N uptake was reduced significantly in the following year and less than grass monoculture or intercropping and close to crop rotation catch crops.Amount of nitrate reduction(0-200 cm) showed poplacatch cropsalfalfa and alfalfa+bromus and crop rotationtall fescue.Root zone and the deep nitrate accumulation of poplar had a strong leaching downward trend.The peak appeared in the depth of 80-100 cm and 120-180 cm where it was leaching 60 cm below the labeled place.Under catch crops,leaching of nitrate occurred to some extent for deep accumulation in the profile.There was a significant positive correlation between plant root length density and soil nitrate decrease in 0-100 cm soil layer.【Conclusion】 In the high nitrate accumulation soil,grass monoculture or intercropping can reduce soil nitrate content rapidly.Nitrogen absorption in the topsoil of tall fescue was more than other plants.Alfalfa had a advantage in the relatively long term restoration.
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Claims 9
Claim · model-written summary
Grass monoculture or intercropping biomass and nitrogen uptake increased with cultivation period and exceeded crop rotation and catch crops after two years.
Verbatim
e0“biomass and N uptake of grass monoculture or intercropping on the ground increased significantly with the cultivation period,and was significantly higher than crop rotation and catch crops after 2 years”
Claim · model-written summary
Poplar had the greatest biomass.
PopulusOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“poplar had the greatest biomass”
Claim · model-written summary
Poplar nitrogen uptake fell in the following year and was below grass systems.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“poplar had the greatest biomass,N uptake was reduced significantly in the following year and less than grass monoculture or intercropping”
Claim · model-written summary
Poplar root-zone and deep nitrate accumulation showed downward leaching.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Root zone and the deep nitrate accumulation of poplar had a strong leaching downward trend.”
Claim · model-written summary
Catch crops had some deep-profile nitrate leaching.
Verbatim
e0“Under catch crops,leaching of nitrate occurred to some extent for deep accumulation in the profile.”
Claim · model-written summary
Root length density correlated positively with nitrate decrease in the 0-100 cm layer.
Verbatim
e0“significant positive correlation between plant root length density and soil nitrate decrease in 0-100 cm soil layer”
Claim · model-written summary
Grass monoculture or intercropping can rapidly reduce soil nitrate in high-nitrate soil.
Verbatim
e0“In the high nitrate accumulation soil,grass monoculture or intercropping can reduce soil nitrate content rapidly.”
Claim · model-written summary
Tall fescue absorbed more topsoil nitrogen than other plants.
- Taxon
- tall fescue
Lolium arundinaceume0 - Outcome
- Nitrogen absorptione0
- Direction
- more thane0
- Comparator
- other plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Nitrogen absorption in the topsoil of tall fescue was more than other plants.”
Claim · model-written summary
Alfalfa had an advantage for relatively long-term restoration.
- Taxon
- Alfalfa
Medicago sativae0 - Outcome
- advantage in the relatively long term restoratione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Alfalfa had a advantage in the relatively long term restoration.”