應用于澳大利亞南部鹽堿化及干旱化的沿海平原的管理的地下水與農藝集成模型

以下是資料介紹,如需要完整的請充值下載. 本資料已審核過,確保內容和網頁里介紹一致.  
無需注冊登錄,支付后按照提示操作即可獲取該資料.
資料介紹:

應用于澳大利亞南部鹽堿化及干旱化的沿海平原的管理的地下水與農藝集成模型(中文5500字,英文3300字)
摘要:
綜合建模方法是用來探索旱鹽地治理方法的一種辦法.針對此項研究,提出了三種模型:地下水流數值模型,農藝模型與經濟模型.地下水流數值模型為不同類型土地用水進行地下水位線預測,農藝模型根據表層地下水含鹽量及季節性降水量為農作物及牧草產量進行定量.經濟模型則是一種針對農業總收入,支出及貼現率的一種模型.將這三種模型綜合起來,可為南澳大利亞海岸平原上105平方千米的農場提供關于地下水位線,農產品,農業收入的相關信息.此模型為未來二十年間提供了當前使用的,以及可供選擇的多種土地管理方法.結果指出,深根四季草場的建立能夠降低地下水回灌率及土地鹽堿率,從而提高產量.然而,改良鹽堿地支出巨大.與現行的土地管理方法相比,四季草場的利潤極其微小,并對未來的農產品價格和貼現率依靠極大.本論文在此提供了一個處理農業管理中多種環境問題的整體性辦法.并對其優缺點進行了討論.1997年埃爾塞維爾科學出版社.
Integrated groundwater flow and agronomic modelling for management of dryland salinity of a coastal plain in southern Australia
Abstract
An integrated modeling approach’ was used to explore a range of options for land management to control dryland salinity. Three models were developed for this study: a numerical groundwater flow model which predicts groundwater levels for various land uses; agronomic models quantifying crop and pasture yield response to shallow saline watertables and seasonal rainfall; and a financial model of farm revenues, costs and discount rates. When combined, these provided information on groundwater levels, agricultural production, and farm incomes for a 105-km2 site on a coastal plain in southern Australia.The simulations included current as well as various alternative land management options for a 20-year period.The results indicated that the establishment of deep-rooted perennial pastures can reduce both rates of groundwater recharge,thereby enhancing productivity.However,the cost of reclaiming salinised land is high.Compraed with current land management practices,the economic benefit of perennial pasture is marginal,and depend strongly on future farm commodity prices and discount rates.The methodology described herein represents a holistic means of dealing with a variety of environmental problems of agricultural management.Its advantages and disadvantages are also discussed.1997 Elsevier Science B.V.

302宿舍白露全文阅读