Beijing Engineering Technology Res Center For Explor And Utiliz Of Non Conventional Water Rsrc

Beijing, China

Beijing Engineering Technology Res Center For Explor And Utiliz Of Non Conventional Water Rsrc

Beijing, China
SEARCH FILTERS
Time filter
Source Type

Yin S.,Beijing Hydraulic Research Institute | Yin S.,Beijing Engineering Technology Res Center For Explor And Utiliz Of Non Conventional Water Rsrc | Wu W.,Beijing Hydraulic Research Institute | Wu W.,Beijing Engineering Technology Res Center For Explor And Utiliz Of Non Conventional Water Rsrc | And 2 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

To analysis the spatial distribution of groundwater nitrate-nitrogen and its pollution causes of reclaimed water irrigation region in Beijing, based on geostatistics model and geostatistical analyst module of ArcGIS. The spatial distribution maps of groundwater nitrate-nitrogen and semi-variogram function was proposed, which represented the probability and structural characteristics. The results showed that the groundwater nitrate-nitrogen satisfied log normal distribution and one-order Gaussian model can capture the characteristics well in the reclaimed water irrigation region. The prediction of distance statistical correlation of groundwater nitrate-nitrogen was 9639.36 m, and the distance between two sampling sits should be smaller than this value. The nugget effect value was 0.43, which implied that nitrate-nitrogen concentration distribution was controlled by structural factors and human activity. Land use style and groundwater withdrawal intensity directly influenced the probability of groundwater nitrate-nitrogen pollution. The depth of monitoring wells was smaller, the decline of groundwater level was greater, the increase in groundwater nitrate-nitrogen was greater. The risk of nitrate-nitrogen pollution of groundwater caused by accumulated areas of reclaimed water maintained low. The study provides a reference for quantifying the groundwater pollution risk and security of wastewater utilization in agriculture.


Ma F.,Beijing Hydraulic Research Institute | Ma F.,Beijing Engineering Technology Res Center For Explor And Utiliz Of Non Conventional Water Rsrc | Liu H.,Beijing Hydraulic Research Institute | Liu H.,Beijing Engineering Technology Res Center For Explor And Utiliz Of Non Conventional Water Rsrc | And 4 more authors.
Nongye Gongcheng Xuebao/Transactions of the Chinese Society of Agricultural Engineering | Year: 2012

In order to explore appropriate irrigation mode of soilless culture anthurim, effect of drip irrigation with different irrigation threshold on water use and biomass of soilless culture anthurim in multi-span greenhouse were investigated. The experimental anthurium was planted in plastic pot with substrate. The low irrigation threshold was designed based on the proportion of irrigating substrate moisture content with the substrate moisture capacity(θ FC), and treatments included 90%θ FC(T1), 80%θ FC(T2), 70%θ FC(T3), 60%θ FC(T4) and 50%θ FC(T5). Results showed that the irrigation water use efficiency was only 0.4 to 0.5 under experiment condition. The substrate moisture content and irrigation water use efficiency decreased with low irrigation threshold reduction, but the irrigation cycle increased reversely. Compared with T1, the flower size and quantity of T4 were similar, but the plant height and crown diameter were larger than T1 significantly, the plant height increased 19.3% and the crown diameter increased 14.7%. T2 and T3 had no obvious influence on anthurium's flower and biomass compared with T1, but T5 reduced the flower size. Water consumption amount of one pot anthrium was about 2522 g to 2986 g during experiment. Compared with T1, water consumption amount of T2, T3, T4 and T5 decreased 4% to 16%. Lower water consumption amount and better flower quality were got from the treatment with low irrigation threshold of 60%θ FC, so 60%θ FC was appropriate low irrigation threshold for experimental anthurim.

Loading Beijing Engineering Technology Res Center For Explor And Utiliz Of Non Conventional Water Rsrc collaborators
Loading Beijing Engineering Technology Res Center For Explor And Utiliz Of Non Conventional Water Rsrc collaborators