BIODIVERSITY IN AGROECOSYSTEMS - CHAPTER 4 pptx

... beneficials. Today, high-yielding, high-quality, insect-, disease-, and weed-free monocultures require high-energy inputs to produce and harvest. With production costs escalating, interest in enduring and efficient ... Forstwirtsch. Berlin Dahlem, 247 :129–137. Bosch, J., 1987. Der Einfluss einiger dominanter Ackerkräuter auf Nutz- and Schadarthro- poden in einem Zuckerrübenfeld, Z. Pflanzenk...

Ngày tải lên: 11/08/2014, 17:20

... used interchangeably instead of less professional- sounding terms such as "things" or "stuff." Plain English Capital is the original amount you invested in your financial instrument. ... your financial instrument. A capital gain is an appreciation of the value of the financial instrument, such as a stock, in which the initial principal was invested. If your stock is wo...

Ngày tải lên: 01/07/2014, 21:20

... noticeable increases in crop production, but maintaining biodiversity can retard the deterioration that has characterized agroecosystems through 40 00 years of human history. Protozoa can serve as bioindicators ... Environ., 40 :207–218. Foissner, W., 19 94. Soil protozoa as bioindicators in ecosystems under human in uence, in Soil Protozoa, J. F. Darbyshire, Ed., CAB Internation...

Ngày tải lên: 11/08/2014, 17:20

... Orchesella cincta. The lethal concentration (LC 50 ) for atrazine was estimated at 2 24 µg/g atrazine in food. Mortality and molting frequency increased with increasing concentrations of atrazine. The ... W., 19 84. Nitrogen cycling in conventional and no-tillage agroecosystems in the southern Pied- mont, J. Soil Water Conserv., 39:1 94 200. House, G. J., Worsham, A. D., Sheets, T....

Ngày tải lên: 11/08/2014, 17:20

... Nicholls CONTENTS Introduction The Nature and Function of Biodiversity in Agroecosystems Patterns of Insect Biodiversity in Agroecosystems Plant Biodiversity and Insect Stability in Agroecosystems Patterns ... FUNCTION OF BIODIVERSITY IN AGROECOSYSTEMS Biodiversity refers to all species of plants, animals, and microorganisms existing and interacting within an ecosyst...

Ngày tải lên: 11/08/2014, 17:20

... especially in the rain-fed mixed farming systems of the developing world that will provide an incentive for investment in long-term soil fertility improvements, such as the use of inorganic fertilizers ... Cereal World 60–93 49 –65 Developed 17–18 19–33 Developing 123–206 68–91 Sub-Saharan 141 –1 94 136–161 Latin America 76–105 53–77 West Asia and North Africa 1 04 157 74 100 Rest of As...

Ngày tải lên: 11/08/2014, 17:20

... also increases in abundance following exces- sive livestock grazing in the spring (West and Young, 1998). Livestock grazing also reduces the chance of fires by removal of fine fuels in the interspaces ... Reactor, App. D-IV, Idaho Nat. Engineering Laboratory, D -4 7 –D-58. Bork, E. W., West, N. E., and Walker, J. W., 1998. Three-tip sagebrush steppe responses to long-term seasonal sheep g...

Ngày tải lên: 11/08/2014, 17:20

... Medium-Term Plan 199 8-2 000, ICRAF, Nairobi, Kenya. Ingram, J., 1990. The role of trees in maintaining and improving soil productivity — a review of the literature, in Agroforestry for Sustainable ... since in addition to their biodiversity these multistrata damar agroforests in Sumatra are financially attractive. Damar resins are utilized by industries in Indonesia or exported...

Ngày tải lên: 11/08/2014, 17:20

... Neotropical Migra- tory Birds, T. E. Martin and D. M. Finch, Eds., Oxford University Press, New York, 46 1 47 6. Bloom, P. H., 1980. The Status of the Swainson’s Hawk in California, Project W- 5 4- R-12, U.S. ... made illegal in Argentina. An ecotoxicology program was initiated, with field and labo- ratory training for government agents, students, and veterinarians living in the Figure...

Ngày tải lên: 11/08/2014, 17:20

... 1) in the climax stage of succession (Odum, 1969). An increase in physical (inorganic) materials in urban systems coincides with a decreasing P/R ratio (i.e., a significant increase in main- tenance ... diversity in terms of maintaining wild or native species populations. Increased biodiversity at the landscape level (in the form of increased habitat or agroecosystem diversity) wi...

Ngày tải lên: 11/08/2014, 17:20