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Responses of Nitrogen and Related Enzyme Activities to Fertilization in Rhizosphere of Wheat

Pedosphere 1997年第2期7卷 141-148页

作者： YUANLING YUSHANGQI 等 collegeofnaturalresourcesandenvironment SouthwestAgriculturalUniversityChongqing6300716（China） Equip

In the present experiment, wheat seedlings (Trticucum aestivum L.) were grown on a purple soil withvarious fertilizer treatments in order to investigate the responses of nitrogen and related eusyme activitiesin the rhizosphere. The results revealed the increments of both organic matter and total N in the soil withthe proximity to the growing roots, especially in the treatment of supplying pig manure in combination withchemical fertilizer, suggesting that they could come from root and microorganism exudation which could beintensified by inorganic-organic fertilization, being of benefit to improving the physical and biological envi-ronment in the rhizosphere of wheat. Much more inorganic N was observed in the fertilized soils surroundingwheat roots than in the CK treatment, indicating the improvement of crop N supply in the rhisosphere ofwheat by *** activities of invertase, urease and protease in the root zone were greatly enhanced as compared tothose in the other parts of soils except that the urease activities were similar in the rhizo8phere and nonrhi-zosphere of the CK and pig manure treatments, indicating that invertase and protease could be produced bygrowing roots and rhizosphere microorganisms, in contrast to urease which could be stimulated by urea. Also,significant increment of these three enzyme activities in the rhizosphere of wheat by fertilizatioll, especially byapplication of chemical fertilizer combined with pig manurel suggested that fertilization not only acceleratedthe renewal of organic matter but also enhanced bioavailability of organic N in that soil zone. This couldbe the reason why the total amount of inorganic N available for plants was increased more obviously in therhizosphere of wheat of the fertilization treatments than in that of the CK treatment.

关键词： nitrogen rhizosphere soil enzyme wheat

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Plants grown on sewage sludge in South China and its relevance to sludge stabilization and metal removal

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Journal of Environmental Sciences 2003年第5期15卷 622-627页

作者： SAMAKEMoussa WUQi-tang MOCe-hui MORELJean-Louis: collegeofnaturalresourcesandenvironment SouthChinaAgricuhuralUniversityGuangzhou510642China Lab.SoletEnvironnement ENSAIA/INRA54505VandoeuvreFrance

The production of sewage sludge in China has been increasing sharply in order to treat 40% of the municipal sewage in 2005 as planned by central government. The main sludge disposal method is landfill owing to heavy metal contamination, but it presents an attractive potential for agricultural land application. Experiments were carried out to study the simultaneous metal removal and sludge stabilization by plants. The sludge samples were collected from Datansha Wastewater Treatment Plant of Guangzhou, it contained excessive Cu and Zn compared with the Chinese National Standard for Agricultural Use of Sewage Sludge. Plants growing on sludge beds were investigated to follow their growth and metal uptake. 30 sludge plants were identified during 1 year's observation. A Zn high accumulating and high growth rate plant (Alocasia macrorrhiza) was selected and grown on sludge beds in plots. The water, organic matter, heavy metals and nutrients contents, the E. coli number and the cress seed germination index were monitored for the sludge samples collected monthly. The plant growth parameters and its heavy metals contents were also determined. The sewage sludge treated by plants could be stabilized at about 5 months, the E. coli number was significantly decreased and the cress seed germination index attained 100%. Crop on sludge could ameliorate the sludge drying. The experiments are continuing to find out the appropriate plant combination for simultaneous sludge stabilization and metal removal for an acceptable period. Comparisons between the proposed processes and other methods for treating produced sludge such as composting, chemical and bacterial leaching were discussed.

关键词： sewage sludge hyper accumulator heavy metal removal stabilization

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Effect of Combined Application of Organic and Inorganic Fertilizers on Methane Emission from Paddy Soil and Rice Growth

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Pedosphere 1997年第4期7卷 379-382页

作者： LIUKEXING LIAOZHONGWEN 等 collegeofnaturalresourcesandenvironment SouthChinaAgric.Univ.Guangzhou510642（China） CollegeofNatural

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