NDLI: Sustainable use of agricultural ecosystems: an optimum control problem

Content Provider	IEEE Xplore Digital Library
Author	Seppelt, R. Richter, O.
Copyright Year	1995
Description	Author affiliation: Inst. of Geocology, Tech. Univ. Brunswick, Germany (Seppelt, R.)
Abstract	Agricultural ecosystems comprise both natural and socioeconomic processes. By introducing fertilizing, harvesting or irrigation as control variables, one is led to the formulation of control problems. A main problem is the development of suitable performance criteria if both economic and ecological aspects are taken into account. The use of control theory leads to two major problems. The first concerns the choice of performance criteria. An appropriate performance criterion consists of an economic and an ecological part. In the framework of economic theory, environmental side-effects are referred to as external costs. Several approaches for including external costs are presented. The second problem concerns the definition of sustainability, which implies the derivation of long-term strategies. Time horizons are much longer. Objectives valid for one vegetation period cannot be applied to crop rotations or farming systems. Simulations show that local optimization does not lead to global sustainability. Using optimal control theory in ecology quickly leads to numerical problems. If one focuses on small, preferably linear models, analytic solutions of optimization problems are obtained by the application of known maximum principles. As ecological systems include complex nonlinear relationships, solutions can be derived by numerical optimization only. As the underlying model contains discrete and continuous model equations, the optimization results are derived by using dynamic programming.
Starting Page	62
Ending Page	69
File Size	473422
Page Count	8
File Format	PDF
ISBN	0780333659
DOI	10.1109/KTSC.1995.569154
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1995-06-08
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Irrigation Costs Biological system modeling Ecosystems Crops Optimal control Vegetation Environmental factors Control theory Environmental economics
Content Type	Text
Resource Type	Article

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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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