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Wang, Dongmei
- Diversity of Plants on the Alluvial Islands of Lijiang River Basin and the Physicochemical Properties of their Soil
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Authors
Lu Yang
1,
Dongmei Wang
1
Affiliations
1 Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, CN
1 Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, CN
Source
Nature Environment and Pollution Technology, Vol 14, No 3 (2015), Pagination: 533-540Abstract
Alluvial islands are unique river landscapes. The vegetation composition of Alluvial islands and the physicochemical properties of its soil are good indicators for studying plants in its riparian zone. This study explores and determines the relationship between the biological diversity of vegetation and the physicochemical properties of soil in the alluvial islands of Lijiang River basin. A field investigation of different vegetation gradient belts in three alluvial islands and an analysis of their soil samples is conducted. Results show that the composition of vegetation species on the three experimental plots is as follows: 6 families, 8 genera and 8 species on experimental plot (I); 8 families, 12 genera and 12 species on experimental plot (II); and 17 families, 18 genera and 18 species on experimental plot (III). Values of four plant-diversity indices, namely, Margalef richness index, Shannon-Wiener diversity index, Pielou evenness index and Simpson species dominance index, are substantially influenced by the vegetation gradient zone. Change in the gradient zone from gravel to bushes and trees, leads to decreased sand-grain content and increased silt and clay contents, and gravel content of surface soils significantly declines with change in gradient zones. Six types of chemical indicators of soil (organic matter, total nitrogen, available nitrogen, available phosphorus, total potassium, and available potassium) show significant differences with change in gradient zone. Significant correlations were found between plant diversity and physicochemical properties of the soil.Keywords
Lijiang River, Alluvial Islands, Plant Diversity, Physical and Chemical Properties of Soil.Full Text
- Plant Diversity and its Correlation with the Physicochemical Properties of Soil in Different Gradient Levels in the Riparian Zone of Lijiang River
Abstract Views :189 |
PDF Views:0
Authors
Lu Yang
1,
Dongmei Wang
1
Affiliations
1 Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, CN
1 Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, CN
Source
Nature Environment and Pollution Technology, Vol 15, No 2 (2016), Pagination: 605-613Abstract
Riparian zones are the most diverse and complex biophysical habitats being threatened by anthropogenic activities. Degradation of riparian vegetation is a serious problem. This study conducted a field standard sample plot investigation and experiments to evaluate plant diversity and the physicochemical properties of soil in different gradient levels of a riparian zone. The distribution patterns of plants and their correlation with the physicochemical properties of soil were also analysed. This study provides a theoretical basis for ecological protection, vegetation recovery, and vegetation reconstruction in a riparian zone in Guangxi and in the whole karst region of southwestern China. Ten typical sample plots in the riparian zone of Lijiang River in Guilin City, Guangxi Province, were selected. Various parameters, including quantitative characteristics of the plots and physicochemical properties of soil, were analysed. Results revealed that species abundance, diversity, and richness, as well as evenness indexes of plant communities in the riparian zone increased with the increase in gradient zone variation. The species diversity, Shannon-Wiener index, and evenness indexes of the plants in the herbal zone did not significantly differ from those in the shrub zone. Species richness index also significantly increased. In addition, the species richness indexes in the shrub zone did not significantly differ from those in the arbor zone. Physicochemical analysis revealed that the soils in the gradient zones were primarily composed of neutral and slightly alkaline sand. Soil bulk density initially increased and then decreased with the increase in relative altitude. The organic matter contents in the soil also increased. Changes in total nitrogen, total potassium, quick-acting potassium, and total phosphorus were not significant. Multiple regression analysis indicated high fitting degrees of total biomass, diversity, and environmental elements. Moreover, the contribution of soil texture on diversity was higher than that of soil nutrients.Keywords
Plant Diversity, Physicochemical Properties of Soil, Riparian Zone, Lijiang River.Full Text
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- Study on the Absorption Mechanism of the Sediment to Phosphorus in Yangtze River Yibin Section
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Authors
Affiliations
1 Southwest Jiaotong University, No. 111 North 1st Section, Erhuan Road, Chengdu, CN
1 Southwest Jiaotong University, No. 111 North 1st Section, Erhuan Road, Chengdu, CN
Source
Nature Environment and Pollution Technology, Vol 12, No 1 (2013), Pagination: 87-91Abstract
Through laboratory study, the isothermal absorption characteristics and dynamics characteristics of sediment to phosphate in Yangtze River Yibin Section were analysed. The study shows that the absorption curve of sediment is in good compliance with Langmuir and Freundlich isothermal absorption curves, which means that the sediment can absorb the phosphate spontaneously, and the absorption is done by polymolecular layer, for which the maximum theoretical absorption amount is 13.969mg/g, and the empirical constant n>1, which shows the sediment in Yangtze River Yibin Section has great absorption activity. Through analysis of primary and secondary dynamics model, it shows that the absorption of phosphorus is divided into fast absorption and slow absorption period, and the secondary dynamics equation can simulate the process more accurately. Under different sediment and water ratio, the relative error of theoretical equilibrium concentration and experimental equilibrium concentration calculated from the equation is less than 5%.Keywords
Yangtze River, Sediment, Phosphorus, Absorption Mechanism.Full Text
- Soil Bacterial Diversity and its Determinants in the Riparian Zone of the Lijiang River, China
Abstract Views :309 |
PDF Views:75
Authors
Affiliations
1 Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, CN
2 Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, CN
1 Key Laboratory of Soil and Water Conservation and Desertification Combating, Ministry of Education, School of Soil and Water Conservation, Beijing Forestry University, Beijing 100083, CN
2 Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, CN
Source
Current Science, Vol 117, No 8 (2019), Pagination: 1324-1332Abstract
This study was designed to analyse the soil bacterial community composition and diversity, as well as their relationships with various environmental factors in a riparian ecosystem. The 16S rRNA sequencing technology was applied to profile the bacterial composition of 120 samples from four different transects (long, moderate, less and rare inundation) in ten different study sites along the Lijiang riparian zone; the corresponding soil properties were also measured. The results indicated that, diversity was lowest in the rare inundation transect and there were high yet not significantly different bacterial community diversities in the long, moderate, and less inundation transects. The dominant bacterial groups of the four transects were similar, but there were great differences in the abundances of specific groups. Proteobacteria (29.28%), with the dominant classes of Beta- (15.65%), Delta- (5.75%), Gamma- (4.46%) and Alpha-proteobacteria (3.32%), was the most abundant phylum in the studied riparian soils. The genus Candidatus Nitrososphaera including ammonia-oxidizing archaea (AOA) and the genus Nitrospira including nitrite-oxidizing bacteria were both sensitive to inundation gradient changes. Redundancy analysis revealed that soil properties such as soil pH, inundation frequency, sand content, soil water content, total N and available N were significantly correlated with the bacterial community diversity and structure. The study suggests that the flood disturbance gradient and the spatial heterogeneity of soil properties affect the composition and diversity of bacterial communities in the Lijiang riparian zone.Keywords
Bacterial Diversity, Inundation, River Zone, 16s rRNA Sequencing, Soil Physicochemical Properties.Full Text
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