Habitat suitability evaluation of invasive plant species in Liaoning Province: Based on Biomod2 combination model.

, as a major invasive plant in Liaoning Province, is difficult to be removed after its successful invasion, and is a great threat to ecological environment and biodiversity. To evaluate the habitat suitabi-lity of , we collected its geographic distribution data in Liaoning Province through field investigation and database query, and using the Biomod2 combination model, and investigated its potential and suitable distribution areas and main influencing environmental variables at present and under future climate change scenarios, respectively. The results showed that the combined model which composed of GLM (generalized linear model), GBM (generalized boosting regression model), RF (random forest model), and MaxEnt (maximum entropy model) had a good performance.

[Recognition of priority area of biodiversity conservation in Liaoning Province, Northeast China].

Priority areas of biodiversity conservation (PABC) were classified to strengthen biodiversity conservation in China. As there are no such priority areas in Liaoning Province, China, it is important to make up this gap. After calculation of seven indices at three composition levels (ecosystem conservation, human interference, and regionalization for biodiversity conservation), index values, composition values, and comprehensive recognition value for PABCs in Liaoning Province were obtained successively.

[Effect of Decomposing Products of Immobilized Carriers on Desorption of Pyrene in Contaminated Soil].

Batch experiments were conducted to investigate the effect of soluble and insoluble decomposing products (decomposed for 1 day and 120 day; noted by DP1 and DP120, respectively) from immobilized carriers (corncob) on the desorption of pyrene in PAH-contaminated soil (120 d ageing, 20 mg x kg(-1)). It was found that (1) adding decomposing products of immobilized carriers could not only increase the rapidly desorbing fraction, but also improve the desorption rate of pyrene. The desorption rates of pyrene increased from 20% to 81.

[Effects of root exudates of clover (Trifolium repens) on PAH microbial degradation and dioxygenase].

To demonstrate rhizospheric effect on the mechanism of (polycyclic aromatic hydrocarbon) PAH degradation, and to establish a proper joint phyto-microbial remediation mode, microcosms containing microorganisms and PAHs (pyrene and benzo[a]Pyrene) were added with clover (Trifolium repens) root exudates to study their effects on PAH degradation. Dioxygenase gene and 16S rDNA gene copy number changes during the biodegradation process were analyzed, and the microorganism with a good ability for degrading PAHs was identified. The results showed that Mycobacterium M1 had the capability to degrade PAHs.

[Assessment of bioaccessibility of PAHs in microbial degradation process using solid phase micro extraction and solid phase extraction].

In order to demonstrate the variation of bioaccessibility of PAHIs in microbial degradation process, PAH contaminated coking plant soil was remediated using microbial agent, and the bioaccessibility of PAHs was assessed using solid phase micro extraction (SPME) and solid phase extraction (SPE), difference and correlation between PAH degradation and PAH bioaccessbility variation were also analyzed. Results showed that the dominant PAHs in the coking plant soil and its pore water were low molecular weight (LMW) PAHs, and 68.3% of total PAH was degraded by the microbial agent, which was mainly due to the LMW PAH degradation.

[Study on phytoremediation of phenanthrene-contaminated soil with alfalfa (Medicago sativa L.)].

Pot experiment was used to investigate phytoremediation of phenanthrene-contaminated soil with alfalfa (Medicago sativa L.). Results indicated that phenanthrene had inhibitive effect on alfalfa growth, and higher phenanthrene concentration seriously prevent alfalfa growth.

Temporal-spatial distribution and variability of cadmium contamination in soils in Shenyang Zhangshi irrigation area, China.

Heavy metal contamination in soils has been of wide concern in China in the last several decades. The heavy metal contamination was caused by sewage irrigation, mining and inappropriate utilization of various agrochemicals and pesticides and so on. The Shenyang Zhangshi irrigation area (SZIA) in China is a representative area of heavy metal contamination of soils resulting from sewage irrigation for about 30 years duration.

Photochemical behavior of benzo[a]pyrene on soil surfaces under UV light irradiation.

The rates of photodegradation and photocatalysis of benzo[a]pyrene (BaP) on soil surfaces under UV light have been studied. Different parameters such as temperature, soil particle sizes, and soil depth responsible for photodegradation, catalyst loads and wavelength of UV irradiation blamed for photocatalysis have been monitored. The results obtained indicated that BaP photodegradation follows pseudo-first-order kinetics.

Greenhouse gas emissions from a constructed wetland for municipal sewage treatment.

The fluxes of greenhouse gases (methane and nitrous oxide) emission from a constructed wetland in the Eastern China as municipal sewage treatment were measured from June 1999 to August 2000 by the closed chamber method. The constructed wetland for municipal sewage treatment is a significant source of methane, up to 976.6 x 10(6) g CH4/a, which was emitted from the constructed wetland with the area of 495,000 m2 and wastewater loading rate of 12,000 m3/d.