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Why do most forested ecosystems tend toward a long-term, “sustainable” level of soil organic matter?
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- Science has rarely documented long-term, soil-based productivity decline in forested ecosystems due to forest harvesting as normally practiced. Where it has been documented, some common themes have emerged. Identify what types of soil conditions might first succumb to forest harvesting. What management techniques might tend to harm productivity, especially in the long-term? Be sure to explain your answers.Tropical rain forests are known for their high primary productivity. Which set of conditions allows this to be true? Low moisture, high temperature, intense solar radiation High moisture, high temperature, intense solar radiation High moisture, moderate temperature, weak solar radiation Moderate moisture, moderate temperature, moderate solar radiationDoes soil survey compose all the valuable data needed for the study in resource conservation?
- All of the following are reasons why tropical rain forests less likely to grow back as secondary growth forests after widespread deforestation (when compared to temperate forests) EXCEPT: Question 25 options: - All of the above are significant reasons why tropical rain forests may not grow back after widespread deforestation. The soil of tropical rain forests contains much less organic matter and nutrients compared to the soil of temperate forests. - The trees in tropical rain forests are largely responsible for returning water vapor back to the atmosphere through evapotranspiration, so when they are gone, the rains come less frequently. - A larger percentage of the nutrients in a tropical rain forest system are stored in the trees themselves than in temperate forests. - Almost all tropical rain forest species are wind-pollinated, which is less reliable than insect-pollination so tree reproduction is affected more by “chance.”Which of the following ground cover conditions contributes to the highest loss of topsoil and moisture? grasslands Otilled soil woodlands grain cropsExplain the principles of soil conservation and providesolutions to soil erosion and land degradation
- Why are total soil concentrations poor indicators of the amounts of ions that may bioaccumulate (enter the food chain)?In considering all the terrestrial biomes, what is the general effect of precipitation on soil fertility?Why is the weathering of bedrock in a New Hampshire forest responsible for such a small fraction of the nutrients available to plants?
- How can soil erosion lead to desertification? It reduces the level of organic matter It promotes flooding that destroys vegetation It promotes salinization that destroys soil structure Which of the following is not a factor that may lead to urban sprawl? Pollution Immigration Overpopulation Which statement is NOT true about soil salinization? Soil dehydrates due to decrease in accumulation of water underground. Starts by attempting to wash the salts out of the topsoil by pumping more water. Results to the damage and killing of plants as saline water surrounds its deep roots. Which would most likely happen if too much nutrient entered a freshwater ecosystem? Algae will decrease, leaving few food resources, for fish. Nutrients would sink to the bottom, increasing soil deposition. Algae breakdown lowers dissolved oxygen, causing fish to suffocate.Given your knowledge of temperate biomes, why can temperate seasonal forests retain more of their soil fertility than tropical rainforests after they are logged?Why would the deciduous hardwood forests have a warmer soil temp than conifer forests? How does the difference in soil moisture between these two forests relate to your answer above regarding soil temp?