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Zhang X.-L.,Beijing Research and Development Center for Grass and Environment | Li X.-N.,Beijing Research and Development Center for Grass and Environment | Wu J.-Y.,Beijing Research and Development Center for Grass and Environment | Zheng W.,Beijing Research and Development Center for Grass and Environment | And 3 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2010

In the present paper, the feasibility of determination of total nitrogen (TN) content in different types of soil based on NIS technology was studied. Some surface and subsurface soil samples were collected from Jiangsu, Henan, Shanxi, Hebei and Jilin province in China, on behalf of paddy, calcareous, loess, coastal alluvial and black soil types separately. After being air-dried, milled and screened, the scanned spectra were obtained by near-infrared spectrometer using the sample with diameter below 1 millimeter, meantime the content of TN was measured with the traditional Kelvin method. A model between TN content and spectrum was established and also it was modified through some spectrum pretreatment using the OPUS software. Then a best model was chosen with root mean squares of crosscheck (RMSECV) being the lowest. Finally the stability and application of the model was discussed through quantitative analysis. The results showed that a good model can be separately established in each province using the surface soil from the same area on behalf of the same soil type, whose RMSECV were within 0.01% on average, and the correlation efficient was above 0.85 basically. The model established using the surface soil can be well used for analysis of TN content in other surface and subsurface soil from the same area whose TN was within the range of the model. The root mean squares of prediction (RMSEP) and correlation efficient of the quantitative analysis were at about 0.01% and 0.80 separately. However, maybe affected by soil types, the model established in one area had certain limitations in the application to other areas even as its TN content was within the range of the model. Whenas, choosing some data from each area randomly to form a new sample group can establish a good new integrated model with RMSECV and correlation efficient being 0.010 2% and 0.985 6 respectively and that can be well used to predict TN content in soil from each area.


Wang Q.,Beijing research and development center for grass and environment | Que X.,Chinese Academy of Forestry | Yao S.,Beijing research and development center for grass and environment | Xiao B.,Beijing research and development center for grass and environment | Li C.,Beijing research and development center for grass and environment
Applied Mechanics and Materials | Year: 2013

Multiple sediment quality parameters, including pH, TN, TP, organic carbon and microbial biomass, were used to evaluate the remediation efficiency of the river restoration project carried out in Chaohe river. The results showed that: during the investigation period, for the pH of sediment, there was not significant difference between the planted treatment and the non-planted control; the mean removal efficiencies of TN and TP were 22.0% and 10.6% in sediment, respectively. The maximum removal efficiencies for the sediment were 36.7% on the on TN and 12.7% on TP, which occurred in July. The result suggested that the restoration of aquatic vegetation could potentially be used for pollution preventability and removal in the river for drinking water resource. © (2013) Trans Tech Publications, Switzerland.


Yang X.,Beijing Research and Development Center for Grass and Environment | Wu J.,Beijing Research and Development Center for Grass and Environment | Teng W.,Beijing Research and Development Center for Grass and Environment | Yuan X.,Beijing Research and Development Center for Grass and Environment | Chao G.,Beijing Research and Development Center for Grass and Environment
Journal of Plant Resources and Environment | Year: 2013

Using pot system with negative-pressure water supply, differences of growth and photosynthetic characteristics of Carex giraldiana Kük., C. humilis Leyss., C. lanceolata Boott and C. breviculmis R. Br. under sufficient irrigation (CK), moderate and heavy deficit irrigations (relative water content in soil 65. 63% -84. 38%, 26. 04% - 31. 51% and 6. 63% -15. 44%, respectively) were studied. The results show that with decreasing of relative water content in soil, growth increment of above-and under-ground parts, root-shoot ratio, net photosynthetic rate (Pn), transpiration rate (Tr), stomatal conductance (Gs) and solar energy utilization efficiency (SUE) all decrease gradually, intercellular CO2 concentration (Ci) increases gradually, while water utilization efficiency (WUE) generally appears a fluctuant change trend. Under moderate deficit irrigation condition, growth increment of above-and under-ground parts of four species is lower than that of the control, but leaves do not appear wilting and yellowing, while under heavy deficit irrigation condition, that is significantly lower than that of the control and some leaves become wilting and yellowing. Generally, root-shoot ratio of four species under deficit irrigation condition is significantly lower than that of the control. Under moderate deficit irrigation condition, values of Pn, Tr, Gs and SUE of four species all are lower while Ci value is higher than those of the control with no significant difference generally; and only WUE value of C. breviculmis is higher while that of other three species is slightly lower than that of the control. Under heavy deficit irrigation condition, values of Pn, Tr, Gs and SUE of four species all are significantly lower while Ci value is significantly higher than those of the control; and only WUE value of C. lanceolata is slightly lower while that of other three species is higher than that of the control. It is suggested that four species tested all have a certain resistance to deficit irrigation. Effect of deficit irrigation on above-ground part growth of four species is greater than on their under-ground part. And non stomatal factors are the main causes led to Pn decreasing.


Xuejun Y.,Beijing Research and Development Center for Grass and Environment | Juying W.,Beijing Research and Development Center for Grass and Environment | Wenjun T.,Beijing Research and Development Center for Grass and Environment | Xiaohuan Y.,Beijing Research and Development Center for Grass and Environment
WIT Transactions on Engineering Sciences | Year: 2014

To explore the soil conservation and slope stabilization capability of root of ornamental grasses, three kinds of plants Pennisetum alopecuroides, Spodiopogon sibiricus, and Eragrostis curvula that growing in the gravel slope were chosen to perform tensile test. In these tests, single root was used. First, the maximum tensile strength of single root was calculated, and then worked out the tensile resistance capacity of one individual plant. The results suggested that the capacity of tensile was S. sibiricus > P. alopecuroides > E. curvula. Researches of root system distribution show that roots of S. sibiricus and P. alopecuroides are richer in foreign soil of sand river slope, roots of them can reach to 60 cm soil layer both in horizontal and vertical directions. Roots of P. alopecuroides mainly distributed in the foreign soil, and only small part of roots distributed in sand soil. Roots of S. sibiricus were more adapt to the sand soil, mainly distribute in the soil layer of 0-45 cm. Root system of E. curvula only in the foreign layers, and can reach from 0 to 30 cm in horizontal direction, but have no distribution record in the sand soil. © 2014 WIT Press.


Yuan X.-H.,Beijing Research and Development Center for Grass and Environment | Sun N.,Beijing Forestry University | Teng W.-J.,Beijing Research and Development Center for Grass and Environment | Yang X.-J.,Beijing Research and Development Center for Grass and Environment | Wu J.-Y.,Beijing Research and Development Center for Grass and Environment
Journal of Plant Resources and Environment | Year: 2011

Survival and death percentages of seedlings of Stipa bungeana Trin., Eragrostis spectabilis (Pursh) Steud., Pennisetum alopecuroides (L.) Spreng., P. alopecuroides 'Little Bunny', Calamagrostis brachytricha Steud., Arundinella hirta (Thunb.) Tanaka, Achnatherum extremiorientale (Hara) Keng, A. splendens (Trin.) Nevski and Andropogon scoparius Michx. were analyzed by sand culture method under 0 (control), 5, 10, 15, 20 and 30 g · L-1 NaCl stress, and their salt tolerances were assessed according to plant death percentage, NaCl concentrations inducing survival or beginning dead of plant and cluster analysis result of six growth indexes under 5 g · L-1 NaCl stress. On the basis, change of growth indexes of A. splendens with the strongest salt tolerance under NaCl stress was analyzed minutely. The results show that according to plant death percentage, NaCl concentrations inducing survival or beginning dead of plant and cluster analysis result of growth indexes, salt tolerance of the nine grasses tested can be assessed. Although their assessment results are not completely same, but appear similar trend. Combining assessment results based on above three methods, salt tolerance of the nine grasses are classified into four grades: Achnatherum splendens is the strongest; Pennisetum alopecuroides, P. alopecuroides ' Little Bunny', Eragrostis spectabilis and Stipa bungeana are stronger; Andropogon scoparius is middle; Calamagrostis brachytricha, Achnatherum extremiorientale and Arundinella hirta are the weakest. Under NaCl stress, electrical conductivity in cultivating substrate and its leachate for A. splendens increases gradually with rising of NaCl concentration. And response of different growth indexes of A. splendens to NaCl stress is vary, in which, effect of NaCl stress on root length is smaller. With rising of NaCl concentration, height, tiller number, root number, dry weight of stem and leaf, dry weight of root and chlorophyll relative content of A. splendens all decrease gradually, while ratio of root-shoot increases gradually. Under NaCl concentration higher than 10 g · L-1, A. splendens seedling can survive, while maintain growth under NaCl concentration lower than 10 g · L-1. Extremely high and extremely low temperatures and change of electrical conductivity of cultivating substrate have a certain effect on growth and salt tolerance of A. splendens seedling.

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