

An antibiotic producing strain Streptomyces violaceusniger was isolated from soil sample, characterized and studied for antibacterial and antifungal activity profile.
These points can be estimated by introducing the soil factor (Ks) and tree species factor (Kt) to potential evapotranspiration with the Penman formula.
Root biomass, length, and the number of roots in every diameter class, for each soil layer and for each plant species, are regarded as observation variables.
The results show that most of the vertical distributions of plant roots belong to the type wherein the roots are concentrated in the topsoil layer (0-20 cm), far more than those in the lower soil layers.
Ecological Benefit of Reforestation in a Severely Degraded Red Soil Region
Guifeng, Yiyang County, belongs to a seriously degraded red soil region.
(2) Soil aeration and the soil air regime improved.
(3) Proteinase, catalase, and urease in the forest soil to a depth of 40 cm were usually higher than those in the control plot and decreased with soil depth.
Through stepwise regression analyses, three key factors were selected, such as crown density, soil infertility extent, and forestland area.
The results showed that there exists a positive correlation between soil infertility extent and the harm extent of Gypsy moths and a significant negative correlation between the other two key factors and the harm extent of this insect.
euphratica leaves increased rapidly at the beginning of salt stress with a light soil NaCl concentration of 58.5 mmol/L.
Relation between Growth and Vertical Distribution of Fine Roots and Soil Density in the Weibei Loess Plateau
The influence of woodland soil bulk density on the growth and distribution of fine root system of main planting tree species in the Weibei Loess Plateau was investigated by means of pot culture and field survey.
Results indicated that in the woodland of Pinus tabulaeformis, soil bulk density increased with the depth at different sites, while in the woodland of Robinia pseudoacacia, soil bulk density was higher than that in P.
Further analysis implied that there existed negative correlations between soil bulk density and fine root length in the woodland of P.
Effects of Different Management Regimes for Cutover Areas on Soil Carbon Storage in Chinese Fir Plantations
Three years after 50% thinning and 100% clear-cutting, the loss of carbon storage in the soil (0-60 cm) of cutover areas was 16.14 and 45.15%, respectively.
Carbon storage in unburnt soil (0-45 cm) reached 73.36 t/hm2, which was 15.20 t/hm2 higher than that in the soil of burnt areas.
A total of 20.7% of carbon storage in the soil (0-45 cm) of burnt areas was lost 40 days after burning.
Carbon storage in surface soil (0-15 cm) was higher than in the lower soil layer, which amounted to 30.04% (0-60 cm) and 53.52% (0-30 cm) of total carbon storage in the soil.


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