Search

Abstract: MODIS sensor has a high temporal resolution, spectral resolution, and moderate spatial resolution. The data products are widely used in Large-scale and long period dynamic monitoring of drought. This paper focuses on characters of farming rice dominated in Jiangxi province, and analysis on remote sensing monitoring model and drought monitoring indicators which selection the MODIS data products and drought information related from 2000-2008. Established standard for classification of drought in Jiangxi province, and verified instances of 2003 drought in Jiangxi. This study may have a certain significance to agricultural drought monitoring based on rice planting in southern China, because the correspondencematch between the selected TD indices and cloud cover with precipitation and daily maximum temperature evolution curve. [Copyright &y& Elsevier]

Abstract: This paper studies on Poyang Lake natural wetlands. we calculation each month''s vegetation area in Poyang Lake that according to cloudless images of MODIS in 2009. And it had a quantitative analysis for the changes of annual by Poyang Lake wetland vegetation with time; space; and the water level. Poyang Lake wetland vegetation is mainly located in the delta of the river lower reaches. The area is changing with month, each year there are two peaks. Before the flood season that the vegetation area increase from spring to April and May. Entering the flood season, the area had been decreased by water level raised; after season, the area increase again with water level dropped. To the autumn and winter, the areas decreased cause of vegetation withered. [Copyright &y& Elsevier]

Abstract: We studied the responses of soil fauna to a simulated nitrogen deposition in nursery experimental plots in Subtropical China. Dissolved NH4NO3 was applied to the soil by spraying twice per month for 16 months, starting in January 2003 with treatments of 0, 5, 10, 15 and 30 gN/(m2-a). Soil fauna was sampled after 6, 9, 13 and 16 months of treatment in three soil depths (0-5 cm, 5-10 cm, 10-15 cm). Soil available N increased in correspondence with the increasing N treatment, whereas soil pH decreased. Bacterial and fungal densities were elevated by the N treatment. Soil fauna increased in the lower nitrogen treatments but decreased in the higher N treatments, which might indicate that there was a threshold around 10 gN/(m2a) for the stimulating effects of N addition. The N effects were dependent on the soil depth and sampling time. The data also suggested that the effects of the different N treatments were related to the level of N saturation, especially the concentration of NO3" in the soil. [Copyright &y& Elsevier]

Biotransformation mediated by microbes can affect the biogeochemical cycle of arsenic. However, arsenic biotransformation mediated by earthworm-related microorganisms has not been well explored, especially the role played by earthworm skin microbiota. Herein, we reveal the profiles of arsenic biotransformation genes (ABGs) and elucidate the microbial communities of the earthworm gut, skin, and surrounding soil from five different soil environments in China. The relative abundance of ABGs in the earthworm skin microbiota, which were dominated by genes associated with arsenate reduction and transport, was approximately three times higher than that in the surrounding soil and earthworm gut microbiota. The composition and diversity of earthworm skin microbiota differed significantly from those of the soil and earthworm gut, comprising a core bacterial community with a relative abundance of 96% Firmicutes and a fungal community with relative abundances of 50% Ascomycota and 13% Mucoromycota. In addition, stochastic processes mainly contributed to the microbial community assembly across all samples. Moreover, fungal genera such as Vishniacozyma and Oomyces were important mediators of ABGs involved in the biogeochemical cycle of arsenic. This is the first study to investigate earthworm skin as a reservoir of microbial diversity in arsenic biotransformation. Our findings broaden the current scientific knowledge of the involvement of earthworms in the arsenic biogeochemical cycle. [Display omitted] • Profiles of ABG in the earthworm skin dominated by arsenate reduction and transport were observed. • The earthworm skin microbiota differed significantly from those of the soil and earthworm gut. • Stochastic processes strongly shaped the microbial community assembly of earthworm gut and skin. • The earthworm skin as a reservoir of microbial diversity played a vital role in arsenic biotransformation. [ABSTRACT FROM AUTHOR]