共查询到3条相似文献,搜索用时 0 毫秒
1.
Takeshi Honda Hironori Ueda Kiyoshi Takiguchi 《Landscape and Ecological Engineering》2008,4(2):97-102
Using a generalized linear mixed model approach, we determined the most important risk factors affecting the probability of
damage by sika deer in a forest plantation in Japan. Candidate risk factors included tree species, stand age, peripheral dwarf
bamboo community, topographical factors, snow depth, and human disturbance factors. Based on this model, we developed a risk
map of forest damage. The model indicated that the most important risk factor was stand age, followed by tree species and
maximum snow depth. Our predictive model has practical use due to its high classification accuracy (83.9%). To decrease damage
from sika deer, an afforestation plan that incorporates these factors should be implemented. Because it is based on common,
forest GIS data that have recently been compiled by several local governments in Japan, our modeling method of deer damage
can easily be adapted to other areas. 相似文献
2.
Theocharis D. Zagas Dimitrios I. RaptisDimitrios Th. Zagas 《Ecological Engineering》2011,37(2):286-293
Rural development in forested lands and high altitude ecosystems created new regimes and disturbances that set protective function of forests as the most fundamental of all forest functions. Considering protective forests as engineering structures against natural hazards and risks, such as erosion, able to replace costly manmade infrastructures, a methodology is presenting aiming at their spatial identification in a changing mountainous environment. The methodology followed is based on field observations, calibrated models, topographical, geological and climatic data as well as human presence indicators combined properly in a GIS environment. Analysis showed that some forest soils are prone to erosion hazard unable to absorb disturbances like selective logging, revealing the protective role of their forest cover. The spatial identification of the forests with a particular protective function is the necessary step required for the design of a sustainable management of high elevated ecosystems. 相似文献
3.
The rice bug, Leptocorisa acuta (Thunb.) is a major pest of the rice crop in India. A computer simulation model of the bug's population dynamics was formulated using the information generated on the thermal requirements of development stages. It is a mechanistic model which follows the state variable–rate variable approach. The model works based on the accumulation of heat units over stage-specific thresholds of development. Validation using light trap catches has shown that the model has satisfactory predictive value. Simulated population dynamics over the years were compared and the influence of global warming on bug population dynamics was predicted. The model can forecast the pest population in the field and help in timely adoption of management practices. 相似文献