Eight aquatic plant species commonly found in northern China were studied on their removal ability and enrichment ability of nitrogen and phosphor in root, stems and leaf through the pot experiments. The result shows that when the concentration of TP and TN in entering water is ranged from 0.29 to 0.46mg/L and 4.69 to 4.74mg/L respectively,Lythrumsalicaria,IrispseudacorusandTyphaangustifoliahave the higher removal rate of TP, which increased by 18.61%, 17.8% and 16.44%, respectively, compared with the blank;Typha orientalis Presl,Phragmitesaustralisand T.angustifoliahave the higher removal rate of TN, which increased by 21.10%, 21.81%, 21.64%, respectively, compared with the blank.L.salicariahas the best removal ability of TP, the removal rate of TP in root,stem and leaf arrived at 3.57%, 2.13% and 3.34% compared with control.T.orientalis Preslhas the best removal ability of TN. Among the test plant species,L.salicaria, T.orientalis Presl andT.angustifoliaare the best one for the water purification in Ashi River basin.
Wetland is a special terraqueous ecosystem. Wetland ecosystem is an important carbon pool in the world and the carbon stored in which accounts for 15% of the total terrestrial carbon storage. Carbon cycling in wetlands largely affected global carbon cycling and also possibly global climatic change. Carbon cycle model of wetland has been changed by human disturbance is increased which exert a profound and lasting influence upon global change. Some researches show that wetland restoration and reconstruction are helpful to carbon accumulation and GHG reduction. So, through analyze the effect of human disturbance on carbon cycling in wetland, a necessary scientific basis is provided for the study of the effect of wetland on global change.
Hydraulic method for earthwork excavation construction technology has a strong advantage in small environmental pollution, low cost, simple process, energy saving. It follows the idea of a harmonious society and the sustainable development, in line with the energy saving and emission reduction policy that the state promoted and also saving cost. This paper put emphasis on the theory of hydraulic method for earth excavation construction technology, construction process and key operation points, and the problems frequently encountered in construction and countermeasures. Combining with the project in Xinxiang new plain area in Henan province, which is about taking advantage of Yellow River to develop agriculture, the paper illustrates the economic benefit and social benefit of this construction technology.
In this paper, the laser is used as light source and interacted with the solution of milk powder; scattered light-to-transmitted light ratio is used to characterize the milk macromolecules. At first, this paper analyzes the theory of scattered light-to-transmitted light ratio,and a relation model is preliminarily built between the macromolecules and the ratio, then the parameters of the model are fitted through self-made experimental device. The relation model between the fat and protein of milk and the ratio is established.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.