Logs and Snags in a Shola Forest of Kerala, India     

U.M. Chandrashekara  V. Sibichan 《山地科学学报》2006,3(2):131-138

Introduction Dead wood is an important structural and functional component of a forest ecosystem(Fridman and Welheim 2000). Recent studies also indicate that dead wood is important for maintaining both plant and animal diversity in different forest ecosystems (Grove 2001) as it serve as an energy source (Bray and Gorham 1964) and habitat for an array of organisms. Dead wood can also help reduce erosion, increase soil organic matters (McFee and Stone 1966), and suitable conditions for seedli…  相似文献   

Anthropogenic Pressure on Structure and Composition of a Shola Forest in Kerala, India   总被引：1，自引：0，他引：1  

U.M. Chandrashekara P.K. Muraleedharan V. Sibichan 《山地科学学报》2006,3(1):58-70

Introduction Tropical region is endowed with a vast tract of diverse vegetation (Gentry 1992). Among different types of forests, the montane forests, due to their unique features including rich biodiversity andprominent ecological services, have always attracted biologists, bio-geographers, ecologists and forest managers (Doumenge et al. 1995). In India, montane forests covering 7.9 % of total forest area occur in the Himalayan, northeastern and southern parts of the country (Lal 1989). In s…  相似文献   

Diurnal and seasonal variations of radioactivity and electrical conductivity near the surface for a continental location Mysore, India   总被引：3，自引：0，他引：3  

B.S.N. Prasad  K. Nagaraja  M.S. Chandrashekara  L. Paramesh  M.S. Madhava 《Atmospheric Research》2005,76(1-4):65

Simultaneous measurements of the activity concentrations of radon and its progeny, and conductivity of both polarities i.e., positive and negative conductivities, were made at a height of 1 m above the ground at Mysore (12°N, 76°E, 767 m above mean sea level), India. Diurnal and seasonal variations of activities of radon and its progeny show their peak values in the early morning hours throughout the year. Observations show an increase in the concentration of radon and its progeny during nighttime compared to the daytime values, and are higher in winter than in other seasons. The electrical conductivity of the atmosphere that depends on the ionization rate also exhibits similar trends. These results are discussed in terms of ionization rate due to radioactivity and the influence of meteorological parameters on radioactivity. The results also show that the concentrations of radon, its progeny, and the electrical conductivity of both polarities exhibit a positive correlation with the relative humidity and are negatively correlated with the temperature of the atmosphere.  相似文献