[Photosynthetic mechanism of tea yield and quality affected by different habitats].

To understand photosynthetic mechanism of tea yield and quality, an experiment was conducted with four different typical habitats, including three intercropping patterns (S:Osmanthus-Tea, S:Michelia-Tea, S:Osmanthus-Michelia-Tea) and a control (CK) at Changsha Agricutural Observation Station of Chinese Academy of Sciences. The photosynthetic physiological and ecological characteristics of tea yield and quality were examined. The results showed that the habitats S, S, S reduced the leaf temperature (TL), photosynthesis active radiation flux (PAR), net photosynthetic rate (P), transpiration rate (T), and stomatal conductance (g), as well as the tea polyphenol content.

[Effects of Long-term Fertilization on Enzyme Activities in Profile of Paddy Soil Profiles].

The enzyme activity, which is closely related to soil material cycling (mineralization, transformation, etc.), can reflect soil quality and nutrient status. In order to explore the effect of long-term fertilization on the enzyme activity in paddy soil profile (0-40 cm), soils with organic fertilizer and inorganic fertilizer, and non-fertilized soils were selected, and the carbon and nitrogen contents, and the activities of -1,4-glucosidase (BG), and -1,4--acetylglucosaminidase (NAG) in 10cm depths of soil were analyzed.

[Characteristics of the mineralization and transformation of autotrophic microbes-assimilated carbon in upland and paddy soils].

In this study, the mineralization and decomposition of autotrophic microbe assimilated carbon (new carbon) and native organic carbon in three upland and three paddy soils in subtropical China were measured using the 14C-labelled tracer technique. The results showed that, during the 100-d incubation, the mineralization of the 'new carbon' displayed three stages: a rise in the first 10 days, a slowdown from 11-d to 50-d, and a stabilization stage after 50 d. The mineralization ratio of the 'new carbon' ranged between 8.

[Carbon dioxide assimilation potential, functional gene amount and RubisCO activity of autotrophic microorganisms in agricultural soils].

Carbon dioxide (CO2) assimilation by autotrophic microorganisms plays a significant role in carbon sequestration in terrestrial ecosystems. Here, experiments were carried out to determine the contribution of autotrophic microorganisms to atmospheric CO2 fixation in 6 representative agricultural soils. Soils were incubated continuously in an atmosphere of 14CO2 and the distribution of labeled C into soil organic carbon (14C-SOC) was determined after 110 d.

[Characteristics of soil microbial populations in depressions between karst hills under different land use patterns].

Based on the investigation and analysis of six soil microbial indices, eight soil conventional nutrient indices, six soil mineral nutrient indices, and 15 vegetation indices in the farmland, grassland, scrub, forest plantation, secondary forest, and primary forest in the depressions between karst hills, this paper analyzed the main soil microbial populations, soil microbial biomass carbon (MBC), nitrogen (MBN), and phosphorus (MBP) and their fractal characteristics, and the relationships of the soil microbes with vegetation, soil nutrients, and soil mineral components under different land use patterns. The soil microbial populations differed in their quantity and composition under different land use patterns. Primary forest and farmland had the highest quantity of soil microbial populations, while forest plantation had the lowest one.

Preparation, characterization and Hg(II)-sensing behavior of an up-conversion nanocomposite grafted by a rhodamine derived probe: a potential application for eco-industrial park.

In the present work, we designed and synthesized a rhodamine derived "off-on" probe for Hg(II) detection, which might be potentially used in eco-industrial park. By grafting this probe onto the surface of an up-conversion NaYF4:Yb(3+)/Er(3+) excitation source, a Hg(II) sensing system was resulted. The nanocomposite was carefully characterized and analyzed by electron microscopy images, XRD analysis, IR spectra, thermogravimetry, UV-Vis absorption and fluorescence emission.

[Relationships between vegetation characteristics and soil properties at different restoration stages on slope land with purple soils in Hengyang of Hunan Province, South-central China].

By using space series to replace time series, this paper studied the relationships between the vegetation characteristics and soil properties at different restoration stages on the slope land with purple soils in Hengyang of Hunnan Province South-central China. There existed obvious differences in the soil physical and chemical properties at different restoration stages. From grassplot, grass-shrub, shrub to shrub-arbor, the soil organic matter, total and available N, and moisture contents increased markedly, soil bulk density had an obvious decrease, soil total and available P contents changed little, and soil pH decreased gradually, but no significant differences were observed among different restoration stages.

[Cadmium tolerance and enrichment characteristics of Eulaliopsis binata].

A pot experiment was conducted to study the cadmium (Cd) tolerance and enrichment characteristics of Eulaliopsis binata. Applying low concentration Cd (5 mg x kg(-1)) could boost the growth and physiological vigor of E. binata, with the twelve indexes such as biomass and net photosynthetic rate, etc.