A series of pot experiments and field trials were carried out to evaluate the effects of arbuscular mycor- rhizal fungi （AMF） on activities of soil enzymes and carbon sequestration capacity in reclaimed mine soil. A...A series of pot experiments and field trials were carried out to evaluate the effects of arbuscular mycor- rhizal fungi （AMF） on activities of soil enzymes and carbon sequestration capacity in reclaimed mine soil. A complex substrate of coal gangue, fly ash and sludge was used as reclaimed mine soil, and ryegrass was planted with AMF inoculation to construct a plant-complex substrate-microbe ecological restoration sys- tem. The changes to the soil organic carbon （SOC）, activities of soil enzymes and glomalin-related soil protein （GRSP） were measured and the effects of AMF on activities of soil enzymes and carbon sequestra- tion capacity （n reclaimed mine soil were analyzed. The results show that the contents of GRSP （total glo- malin （TG） and easily extractable glomalin （EEG））, SOC and activities of enzymes increased, and the increments were higher in the AMF inoculation treated plant-complex substrate-microbe ecological res- toration systems than those with no AMF inoculated treatments after 12 months of ryegrass growth. TG, EEG and soil enzyme activity have a significant positive correlation, and the correlative coefficient was 0.427-0.573; SOC and TG, EEG have a significant positive correlation （p 〈 0.01 ）, indicating that AMF plays an important role in carbon sequestration of reclaimed mine soils.展开更多
Poyang Lake is the largest freshwater lake in China, and it has a seasonal flooding cycle that significantly changes the water level every year. The aim of this paper was to explain how these hydrological changes infl...Poyang Lake is the largest freshwater lake in China, and it has a seasonal flooding cycle that significantly changes the water level every year. The aim of this paper was to explain how these hydrological changes influence diatom populations in Poyang Lake. The yearly hydrological cycle can be divided into 4 phases: low water-level phase, increasing water-level phase, high water-level phase and decreasing waterlevel phase. Variations in the abundance of planktonic diatoms were studied using quarterly monitoring data collected from January 2009 to October 2013. Generally, diatoms were dominant in Poyang Lake and accounted for more than 50% of the total phytoplankton biomass except in July 2009(26%) and January 2012(35%). Aulacoseira granulata and Surirella robusta were the predominant species in all four phases, and they accounted for 25.02% to 56.89% and 5.07% to 14.78% of the total phytoplankton biomass, respectively. A redundancy analysis(RDA) showed that changes in physico-chemical parameter were related to the water level, and changes in diatom biomass were related to nitrite levels and p H. These results indicate that changes in environmental parameters related to both seasonal variations and water-level fluctuations caused variations in diatom biomass and community composition in Poyang Lake. Furthermore, extreme hydrological events can have different influences on the diatom community composition in the main channel and lentic regions. This research provides data on the diatom variations in Poyang Lake and will be useful for establishing biological indicators of environmental change and protecting Poyang Lake in the future.展开更多
基金supported by the Environmental Science andTechnology Fund of Environmental Protection Department of Jiangsu Province,China (No. 2007024)
文摘A series of pot experiments and field trials were carried out to evaluate the effects of arbuscular mycor- rhizal fungi （AMF） on activities of soil enzymes and carbon sequestration capacity in reclaimed mine soil. A complex substrate of coal gangue, fly ash and sludge was used as reclaimed mine soil, and ryegrass was planted with AMF inoculation to construct a plant-complex substrate-microbe ecological restoration sys- tem. The changes to the soil organic carbon （SOC）, activities of soil enzymes and glomalin-related soil protein （GRSP） were measured and the effects of AMF on activities of soil enzymes and carbon sequestra- tion capacity （n reclaimed mine soil were analyzed. The results show that the contents of GRSP （total glo- malin （TG） and easily extractable glomalin （EEG））, SOC and activities of enzymes increased, and the increments were higher in the AMF inoculation treated plant-complex substrate-microbe ecological res- toration systems than those with no AMF inoculated treatments after 12 months of ryegrass growth. TG, EEG and soil enzyme activity have a significant positive correlation, and the correlative coefficient was 0.427-0.573; SOC and TG, EEG have a significant positive correlation （p 〈 0.01 ）, indicating that AMF plays an important role in carbon sequestration of reclaimed mine soils.
基金Supported by the National Basic Research Program of China(973)(No.2012CB417005)the National Natural Science Foundation of China(No.41301088)the Jiangsu Planned Projects for Postdoctoral Research Funds(No.1401158C)
文摘Poyang Lake is the largest freshwater lake in China, and it has a seasonal flooding cycle that significantly changes the water level every year. The aim of this paper was to explain how these hydrological changes influence diatom populations in Poyang Lake. The yearly hydrological cycle can be divided into 4 phases: low water-level phase, increasing water-level phase, high water-level phase and decreasing waterlevel phase. Variations in the abundance of planktonic diatoms were studied using quarterly monitoring data collected from January 2009 to October 2013. Generally, diatoms were dominant in Poyang Lake and accounted for more than 50% of the total phytoplankton biomass except in July 2009(26%) and January 2012(35%). Aulacoseira granulata and Surirella robusta were the predominant species in all four phases, and they accounted for 25.02% to 56.89% and 5.07% to 14.78% of the total phytoplankton biomass, respectively. A redundancy analysis(RDA) showed that changes in physico-chemical parameter were related to the water level, and changes in diatom biomass were related to nitrite levels and p H. These results indicate that changes in environmental parameters related to both seasonal variations and water-level fluctuations caused variations in diatom biomass and community composition in Poyang Lake. Furthermore, extreme hydrological events can have different influences on the diatom community composition in the main channel and lentic regions. This research provides data on the diatom variations in Poyang Lake and will be useful for establishing biological indicators of environmental change and protecting Poyang Lake in the future.
