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GIS-based Crop Mapping for Oat in China

Author: WanFan
Tutor: SunGuoJun
School: Lanzhou University
Course: Ecology
Keywords: Oat Crop Mapping GIS Multi-Criteria Evaluation Regression model
CLC: S512.6
Type: Master's thesis
Year: 2009
Downloads: 34
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Abstract

Deterioration of ecological environment and unsustainable use of the natural resources has become a serious impediment to agricultural development particularly noticeable in the West of China. Because of the tolerance to infertile, arid and salt environment, cultivation of common oat (Avena sativa L.) and naked oat (Avena nuda L.) can achieve the harmony and consolidation of production and improvement of the environment. In this research the Crop Map of oat in China was conducted as a part of Crop Support System in China.The identification of the suitable areas for oat and the modeling of potential yield distribution for different varieties for oat in China based on GIS are presented in the current article. The main works conducted in this research were as follows:1. Climate, topography, soil and land use databases at different spatial and temporal resolutions were created.2. The suitable areas for common oat (Avena sativa L.) and naked oat (Avena nuda L.) in China using Multi-Criteria Evaluation (MCE) approach based on GIS were identified. Relevant criteria, suitability levels and their weights for each factor were defined. Then the criteria maps were obtained and turned into the MCE process, and suitability maps for common oat and naked oat were created. The land use and the suitability maps were crossed to identify the suitable areas for each crop.3. The correlation of the yield of three oat varieties and Environmental factors were analyzed, factors have significant correlation were select to create a model. Then the stepwise regression models were established for each variety, and the potential yield distributions for each variety were calculated.The results obtained in this research were:1. Very high suitability areas for common oat were located in some mountain areas in Neimenggu, Hebei, Shanxi, Shaanxi, Gansu, Ningxia, Qinghai, Sichuan, Xinjiang and Xizang provinces. Very high suitability areas for naked oat were located in some areas in Heilongjiang, Neimenggu, Jilin, Hebei, Shanxi, Shaanxi, Gansu, Ningxia and Xinjiang provinces. This corresponds with the actual distribution of existing oat plantation sites.2. The results identified 39,772,000 hm~2 of suitable areas for common oats of forage purpose distributed in 744 counties in 19 provinces, and 55,623,200 hm~2 of suitable areas for naked oats of grain purpose distributed in 779 counties in 19 provinces.3. The correlation of the yield of three oat varieties and Environmental factors indicated that precipitation and soil nutrition content were the most important factors to oat yield formation. Precipitation and soil nutrition in April were positively correlated with yield while temperature and wind speed in July were negatively correlated with yield formation of oats.4. The common oat variety of "Qingyj444" could get high yield of 30,000kg/ hm~2 in west of Sichuan, southwest of Gansu, some part of Qinghai and Heilongjiang province. The naked oat varieties of "Bayou3" and "Ping5" could get high yield of 3000kg/ hm~2 in Heilongjiang, north of Shanxi, east of Neimenggu and south Gansu, these areas usually have better rain and soil nutrition conditions.5. "China Crop Mapping Decision System" based on the research results have been constructed and connected with the internet to facilitate the work of decision-makers and farmers.

GIS-based Crop Mapping for Oat in China

Abstract

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