Meiofauna samples from intertidal sediments of Qingdao No.2 Bathing Beach, China, were collected for field study, and subjected to organic enrichment in a laboratory microcosm experiment for 21 d. There were three dif...Meiofauna samples from intertidal sediments of Qingdao No.2 Bathing Beach, China, were collected for field study, and subjected to organic enrichment in a laboratory microcosm experiment for 21 d. There were three different treatments including non-organic addition as the control, low-organic enrichment (2 g DW green algae per 150 mL) and high-organic enrichment (10 g DW green algae per 150 mL). After 21 d, the meiofauna richness decreased in both organic enrichment treatments. Among the three treatments, total meiofauna abundance was significantly different, and the control groups had higher abundance than the other two treatment groups. However, the responses of the meiofauna abundance in the two organic enrichment treatments were non-significantly different. The relationship of meiofaunal abundance and nematode/copepod ratios to organic matter and oxygen level in the microcosm experiments were discussed.展开更多
Carbon nanomaterials have been widely used in industry and inevitably enter the environment.However,there is little information about their influence on the abundance and diversity of soil nematode community.We evalua...Carbon nanomaterials have been widely used in industry and inevitably enter the environment.However,there is little information about their influence on the abundance and diversity of soil nematode community.We evaluated the impact of three kinds of carbon nanomaterials(graphene,graphene oxide,and carbon nanotubes)on the abundance and diversity of soil nematodes after growing tall fescue for 130 d using a laboratory pot experiment.A total of 29 genera of nematodes were identified in all the treatments.Carbon nanomaterials significantly increased the abundance of total nematodes and plant parasites.The presence of graphene and graphene oxide increased the numbers of bacterivores,and graphene benefited fungivores.The total nematode abundance was1.9-2.9 times greater in the carbon nanomaterial treatments than in the control with no carbon nanomaterial addition.However,graphene oxide and carbon nanotubes decreased the values of nematode community parameters,e.g.,diversity,species richness,and structure index.Compared with the control,the addition of graphene resulted in a community with a higher plant-parasitic index(i.e.,the maturity index of the plant-parasitic nematodes).Overall,our findings highlight that the addition of carbon nanomaterials has a negative influence on the composition and diversity of the nematode community,simplifying the community structure.展开更多
A plethora of information is available on the effects of salinity on plant growth and soil physico-chemical properties,but the effects on soil organisms are often neglected.Thus,a systematic investigation of how soil ...A plethora of information is available on the effects of salinity on plant growth and soil physico-chemical properties,but the effects on soil organisms are often neglected.Thus,a systematic investigation of how soil biodiversity,including bacteria,nematodes,mites,and earthworms,changes along saline gradients was conducted along the Bohai Sea coast at Laizhou City,Shandong Province,China,with 30 soil samples randomly selected and classified by salinity into two categories:saline and non-saline.Testing revealed a significantly higher abundance of the surveyed organisms in non-saline soils.The redundancy analysis showed that a negative correlation was observed between electrical conductivity and soil organism abundance in saline soil,but not in non-saline soil.Soil organic matter,available nitrogen,and total nitrogen all positively affected organism abundance in both saline and non-saline soils.The richness and Shannon diversity of nematodes were significantly higher in non-saline soils,but were not significantly different between soil types for other organisms.None of the environmental factors surveyed was obviously related to soil organism diversity.Consequently,our results suggested that soil electrical conductivity only negatively affected soil organisms in saline soil,while soil fertility positively affected soil organisms in both saline and non-saline soils.展开更多
基金funded by the National Natural Science Foundation of China(NOs.40730847,40906063,41076090)
文摘Meiofauna samples from intertidal sediments of Qingdao No.2 Bathing Beach, China, were collected for field study, and subjected to organic enrichment in a laboratory microcosm experiment for 21 d. There were three different treatments including non-organic addition as the control, low-organic enrichment (2 g DW green algae per 150 mL) and high-organic enrichment (10 g DW green algae per 150 mL). After 21 d, the meiofauna richness decreased in both organic enrichment treatments. Among the three treatments, total meiofauna abundance was significantly different, and the control groups had higher abundance than the other two treatment groups. However, the responses of the meiofauna abundance in the two organic enrichment treatments were non-significantly different. The relationship of meiofaunal abundance and nematode/copepod ratios to organic matter and oxygen level in the microcosm experiments were discussed.
基金supported by the National Natural Science Foundation of China(No.31870484)。
文摘Carbon nanomaterials have been widely used in industry and inevitably enter the environment.However,there is little information about their influence on the abundance and diversity of soil nematode community.We evaluated the impact of three kinds of carbon nanomaterials(graphene,graphene oxide,and carbon nanotubes)on the abundance and diversity of soil nematodes after growing tall fescue for 130 d using a laboratory pot experiment.A total of 29 genera of nematodes were identified in all the treatments.Carbon nanomaterials significantly increased the abundance of total nematodes and plant parasites.The presence of graphene and graphene oxide increased the numbers of bacterivores,and graphene benefited fungivores.The total nematode abundance was1.9-2.9 times greater in the carbon nanomaterial treatments than in the control with no carbon nanomaterial addition.However,graphene oxide and carbon nanotubes decreased the values of nematode community parameters,e.g.,diversity,species richness,and structure index.Compared with the control,the addition of graphene resulted in a community with a higher plant-parasitic index(i.e.,the maturity index of the plant-parasitic nematodes).Overall,our findings highlight that the addition of carbon nanomaterials has a negative influence on the composition and diversity of the nematode community,simplifying the community structure.
基金supported by the National Science & Technology Pillar Program during the Twelfth Five-Year Plan Period of China(No.2012BAD14B01)the Ph.D.Programs Foundation of Ministry of Education of China(No.20110008130003)
文摘A plethora of information is available on the effects of salinity on plant growth and soil physico-chemical properties,but the effects on soil organisms are often neglected.Thus,a systematic investigation of how soil biodiversity,including bacteria,nematodes,mites,and earthworms,changes along saline gradients was conducted along the Bohai Sea coast at Laizhou City,Shandong Province,China,with 30 soil samples randomly selected and classified by salinity into two categories:saline and non-saline.Testing revealed a significantly higher abundance of the surveyed organisms in non-saline soils.The redundancy analysis showed that a negative correlation was observed between electrical conductivity and soil organism abundance in saline soil,but not in non-saline soil.Soil organic matter,available nitrogen,and total nitrogen all positively affected organism abundance in both saline and non-saline soils.The richness and Shannon diversity of nematodes were significantly higher in non-saline soils,but were not significantly different between soil types for other organisms.None of the environmental factors surveyed was obviously related to soil organism diversity.Consequently,our results suggested that soil electrical conductivity only negatively affected soil organisms in saline soil,while soil fertility positively affected soil organisms in both saline and non-saline soils.
