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Wan S.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research | Jiao Y.,Hebei Provincial Academy of Water Resources | Kang Y.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research | Hu W.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research | And 3 more authors.
Agricultural Water Management | Year: 2012

A 4-year trial was set up to test the feasibility of growing waxy corn (Zea mays L. var. ceratina Kulesh) in a highly saline wasteland with drip irrigation in the Ningxia plain, northwest China. The original soil salinity expressed as electrical conductivity of the saturation paste extract (EC e) averaged 28dS/m in the 0-120cm depth. The experiment included five soil matric potential (SMP) treatments in which the SMP at 20cm depth below the drip emitters was controlled higher than -5, -10, -15, -20 and -25kPa after waxy corn establishment. The results showed that drip irrigation created a favorable soil condition for waxy corn growth through forming and maintaining a high moisture and low salinity region in the root zone when the SMP was maintained higher than -25kPa. Waxy corn growth and yield parameters increased with the increase of SMP from -25kPa to -5kPa, but their responses to SMP decreased with the prolonged period of cultivation. Irrigation frequency and irrigation amount decreased significantly as SMP decreased from -5kPa to -25kPa, and the highest irrigation water use efficiency (IWUE) was available when the SMP was around -15kPa in 2005, and was between -20kPa and -25kPa in successive years. After years of cultivation and drip leaching, the highly saline soil gradually changed to a moderately saline soil. This research suggests that drip irrigation can be successfully used in growing waxy corn in dry and highly saline conditions after appropriate management strategies are adopted. © 2011 Elsevier B.V.


Fan W.,Beijing Forestry University | Wang X.,Hebei Provincial Academy of Water Resources | Xinxiao Yu.,Beijing Forestry University | Gu J.,Agricultural University of Hebei
ICMREE2011 - Proceedings 2011 International Conference on Materials for Renewable Energy and Environment | Year: 2011

Forest Energy fixes solar energy by photosynthesis of trees. Based on survey on Pinus tabulaeformis standard plots, the guiding curve model of tree height with stand age was established to calculate site index of each standard plot; the relationship model of plant biomass and tree height, diameter was established to calculate stand biomass; the relationship model between stand biomass and stand age, site index, stand density was established, and the relationship model between stand net productivity and stand age, site index, stand density was derived from it. The paper provided a theoretical basis to improve the level of forest management to fix maximum solar efficiency. © 2011 IEEE.


Wan S.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research | Jiao Y.,Hebei Provincial Academy of Water Resources | Kang Y.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research | Jiang S.,CAS Beijing Institute of Geographic Sciences and Nature Resources Research | And 3 more authors.
Irrigation Science | Year: 2013

A four-year trial was set up to test the feasibility of growing oleic sunflower in a very strongly saline wasteland with drip irrigation in the Ningxia plain of Northwest China. The soil salinity expressed as electrical conductivity of the saturation paste extract (ECe) was around 28 dS/m, and soil nutrient was deficient in the upper 120 cm depth. The experiment included five soil matric potential (SMP) treatments, with the SMP at 20-cm depth immediately under the emitters maintained to be higher than -5, -10, -15, -20 and -25 kPa after sunflower establishment. Drip irrigation consistently created a favourable soil moisture and low-salinity region in the root zone when the SMP was maintained higher than -25 kPa. The sunflower dry seed yield decreased by 3.8 % for each unit increase in seasonal average soil salinity in the root zone. Plant vegetative growth, yield characteristics, irrigation frequency and irrigation amount all increased with the increase in SMP from -25 to -5 kPa, and the highest irrigation water use efficiency was available when the SMP was between -10 and -15 kPa (the amount of applied water was around 750 mm). Leaching of salts by drip irrigation gradually turned the very strongly saline soil into a moderately saline soil. This research suggests that drip irrigation can be successfully used in oleic sunflower cultivation in this highly saline soil and a SMP threshold between -10 and -15 kPa is suggested for irrigation scheduling. © 2012 Springer-Verlag.


Liu H.,Agricultural University of Hebei | Han H.,Agricultural University of Hebei | Xu Z.,Hebei Provincial Academy of Water Resources
Research Journal of Applied Sciences, Engineering and Technology | Year: 2013

This study in detail introduced a climate model for regional climate simulation-Statistical Regional Climate Model (Abbrev. Star Model). It explained the scheme and the application of the Statistical Regional Climate Model. The regional simulation was used with respect to "Temperature of 2 m" and "Precipitation" as the characteristic variables of regional climate in the study, the model was calculated and tested by taking Huailai climate station of China in Hebei province as practical example. © Maxwell Scientific Organization, 2013.


Shi Y.,Beijing Forestry University | Shi Y.,China National Environmental Monitoring Center | Yu X.,Beijing Forestry University | Wang X.,Hebei Provincial Academy of Water Resources | Zhang J.,Chinese Research Academy of Environmental Sciences
Journal of Forest Research | Year: 2013

The specific leaf area (SLA) is an important variable reflecting the carbon gain strategy of tree growth, but the relationships between SLA and other environmental factors have not been studied extensively at the stand level. The aim of this study was to define the relationships between stand structure and SLA in order to improve the predictive value of SLA for forest management models. Various parameters of stand structure and specific needle area (SNA) were measured in 14 different even-aged and closed-canopy stands of Chinese pine (Pinus tabulaeformis Carr.). Correlation and regression analysis revealed several significant relationships between stand structure and SNA. Stand density exerted a significant effect on mean-canopy SNA (SNAmean). Stand density was also strongly correlated to mean-layer SNA (SNAL), especially at lower canopy layers. SNAL increased at lower canopy layers within each stand, and the increase was greater in higher density stands. Within the range of stand densities examined in this study, the SNAmean initially increased sharply with increasing stand density, but the rate of rise declined as the density increased. Finally, it reached stability when the stand density was above about 3,000 trees ha-1. © 2012 The Japanese Forest Society and Springer.

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