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Zhang, Xiao-Xi
- Allelopathic Effects of Humus Soil of Platycladus orientalis Forests on Understory Plants in the Loess Plateau, China
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Authors
Affiliations
1 Institute of Soil and Water Conservation, Northwest A&F University, Yangling-712100, CN
2 College of Natural Resources and Environment, Northwest A&F University, Yangling-712100, CN
3 Key Laboratory of Plant Nutrition and the Agri-Environment, Northwest China, Ministry of Agriculture, Yangling-712100, CN
4 College of Forestry, Northwest A& F University, Yangling-712100, CN
1 Institute of Soil and Water Conservation, Northwest A&F University, Yangling-712100, CN
2 College of Natural Resources and Environment, Northwest A&F University, Yangling-712100, CN
3 Key Laboratory of Plant Nutrition and the Agri-Environment, Northwest China, Ministry of Agriculture, Yangling-712100, CN
4 College of Forestry, Northwest A& F University, Yangling-712100, CN
Source
Nature Environment and Pollution Technology, Vol 15, No 1 (2016), Pagination: 317-324Abstract
Allelopathic effect of humus soil of mono-species-community on the understory plants was a critical problem in the mixed reformation of planted pure forests. In order to investigate the practical allelopathic effect of humus soil of Platycladus orientalis forest on understory plants in the Loess Plateau of China and provide a scientific basis for its future management, humus soils of P. orientalis forests in the hilly (north) and gullied (south) areas of the Loess Plateau were sampled separately for pot experiment of 10 common species of shrubs and grasses, and seed germination, seedling growth and physiological indexes were measured during the whole test. According to the comprehensive analysis, humus soil of P. orientalis forest in the hilly area showed obvious allelopathic inhibition on Medicago sativa, Melilotus officinalis, Vicia villosa and Astragalus adsurgens; while in the gully area, it showed obvious allelopathic inhibition on M. officinalis, V. villosa and Coronilla varia. Species which are inhibited by allelopathic effects should be avoided choosing, to form mixed vegetation with P. orientalis.Keywords
Allelopathy, Humus Soil, Platycladus orientalis, Understory Plants.Full Text
- Effects of Brassinolide on Photosynthetic Parameters of Robinia pseudoacacia Seedlings in Petroleum Polluted Soil
Abstract Views :200 |
PDF Views:0
Authors
Affiliations
1 Institute of Soil and Water Conservation, Northwest A&F University, Yangling-712100, CN
2 College of Forestry, Northwest A&F University, Yangling-712100, CN
3 College of Resource and Environment, Northwest A & F University, Yangling-712100, CN
1 Institute of Soil and Water Conservation, Northwest A&F University, Yangling-712100, CN
2 College of Forestry, Northwest A&F University, Yangling-712100, CN
3 College of Resource and Environment, Northwest A & F University, Yangling-712100, CN
Source
Nature Environment and Pollution Technology, Vol 16, No 1 (2017), Pagination: 199-204Abstract
Robinia pseudoacacia seedlings planted in petroleum polluted soil were treated with different concentrations of brassinolide (0, 0.1, 0.3 and 0.5 mg L-1) by dipping the ischolar_main before planting and spraying leaf during leaf expansion period. The gas exchange parameters and photosynthetic fluorescence characteristics of seedlings were determined to study the effects of brassinolide on photosynthesis of R. pseudoacacia seedlings in polluted conditions. The results indicated that the application of brassinolide significantly increased the leaf photosynthetic rate, transpiration rate, stomatal conductance and intercellular CO2 concentration, and it also significantly increased the PSII original light energy conversion efficiency, PSII noncyclic electron transport efficiency, photochemical quenching coefficient and the performance of the electron transfer rate of seedlings. In conclusion, brassinolide could effectively counteract the inhibitory effects of petroleum on the gas exchange and the carboxylation capacity of mesophyll cells of seedlings in 10, 15 and 20 g kg-1, 0.3 mg L-1 was the favourable concentration to be used to counteract the adverse effects of petroleum pollution on R. pseudoacacia.Keywords
Brassinolide, Petroleum Pollution, Robinia pseudoacacia, Photosynthetic Parameters.Full Text
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