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Gansu Agricultural University (2007)

Analysis and Optimum Adjustment on the Agricultural Production Structure of the Dryland in the Region of Cropland to Grassland Conversion in Long Dong

Huang Wen De

Titre : Analysis and Optimum Adjustment on the Agricultural Production Structure of the Dryland in the Region of Cropland to Grassland Conversion in Long Dong

Auteur : Huang Wen De

Grade : Master’s Theses 2007

Université : Gansu Agricultural University

Résumé partiel
Grassland restoration of cropland (forest) project is a major national policy is of great significance to improve the ecological environment and promote sustainable development of agriculture. In order to improve the overall effectiveness of grassland restoration of cropland (Lin), its structure of agricultural production, crop structure optimization and adjustment is very necessary. This study to estimate the productive potential of the study area, analysis of the farmland ecosystem input-output characteristics and energy value of the investment on the basis of, the use of linear programming method, the proposed grassland restoration of cropland area (forest) to optimize the production structure, obtained The main results are as follows : (1) The study area of ??plateau climate productive potential of alfalfa 40946.70 kg / hm 2, corn 9586.47 kg / hm 2, millet 5969.15 kg / hm 2, wheat 6380.13 kg / hm 2, soybeans 2860.00 kg / hm 2 ; sloping climatic potential productivity of alfalfa 37092.89 kg / hm 2, corn 8537.95 kg / hm 2, of millet 8537.95 kg / hm 2 of wheat 5752.58 kg / hm 2, soybeans 2640.00 kg / hm 2. Of different crops plateau to climate production potential higher than the slopes. The temperature to meet the rate of alfalfa and water to meet the rates were 71% and 85%, higher than other crops ; climate alfalfa production potential utilization (eta) Highland and slopes were 32.77% and 32.15%, lower than other crops. Alfalfa high production potential, the alfalfa production potential of the study area is less developed. (2) of the agro ecosystem material flow average investment of 269.39 kg / hm 2 (plateau ground) and 139.00 kg / hm 2 (slopes), the output of 108.41 kg / hm 2 (plateau) the 46.73 kg / hm 2 (slopes) ; material flow into the plateau to higher slopes of 1.48 times, 1.97 times higher output ; material abortion ratio of plateau and slopes were 0.37 and 0.34, higher plateau sloping 10.81%. The flow of energy on average invested Highland of 76.4 MJ / hm 2, the output of 88.61 MJ / hm 2 ; sloping average investment of 30.08 MJ / hm 2, the output of 60.31 MJ / hm 2 ; flow of energy put into Highland higher than the sloping 1.53 times, 0.47 times higher output. Energy abortion ratio of Highland was 0.76, slope of 2.19, higher plateau sloping 188.16%. Value Stream into plateau to an average of 1505.3 yuan / hm 2, the output of 4826.1 yuan / hm 2 ; sloping value stream to invest an average of 754.7 yuan / hm 2, the output of 3232.3 yuan / hm 2 ; Highland value investment in flow above the sloping 0.99 times, 1.15 times higher output. The value stream Plateau real estate investment than 3.21, slope of 4.28, the the Plateau Properties ratio of 33.33% above the sloping. Description Highland Farm Ecosystem high input, high-yield, low utilization efficiency of ecosystems ; sloping low-input, low output, high-use efficiency ecosystem. (3) grassland restoration of cropland (Lin) agro-ecosystems net energy yield ratio increased 35.14%, the environmental impact is reduced by 8.31%, 47.38% increase in system of sustainable development indicators, system stability index increased by 0.809 to 1.015.

Mots clés : Longdong Grassland restoration of cropland ( Lin ) The structure of agricultural production Farm Ecosystem

Présentation (Dissertation topics)

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