Rationality and Sensitivity of Resource Inputs on Outputs in Chaohu City

Here, we estimate the rationality of specific agricultural inputs and discuss the sensitivity of integrated agricultural output to various resources input for Chaohu City, China. We used two parameters, marginal output and elastic coefficient, and the Technique for Order Preference by Similarity to Ideal Solution （TOPSIS） method, which has an unambiguous geometric meaning and is simple and convenient, to integrate various output and input. The results indicate that for most of 2001-2009, agricultural inputs rose except that the number of people engaged in agricultural production fell. Although integrated agriculture output increased, the proportion of resources with a negative utilization efficiency was 23.82% from 2001 to 2009. Integrated output was more sensitive to agricultural pesticide, the irrigation ratio and the use of plastic film. Integrated outputs may be increased by moderate decreases in input. This type of agricultural production meets the requirements of resource saving and is a sustainable mode of resource utilization.

Spatial-temporal distribution and impact factors of irrigation water use efficiency in the grain production of China

The marginal water productivity(MWP)model for the real irrigation water use performance and productivity assessment,applies to the regional scale was established in this study.The temporal-spatial patterns and attribution analyses of the indicator were conducted using spatial autocorrelation and path analysis methods.The results showed that with an average annual increase of 3.4%,the national MWP was estimated to be 0.542 kg/m,between 1998 and 2010.The spatial autocorrelation analysis results showed the global Moran’s I inspection values(Z)were higher than the confidence level,and the provinces,municipalities and autonomous regions(PAMs)with similar MWP values showed significant aggregation.Regions with a high value are centered in the middle and lower streams of the Yellow River,and those regions with a lower MWP were distributed in northeastern China and south of the Yangtze River.The precipitation and temperature are the major meteorological factors that determined the indicator,while extending the fertilizer and agricultural machinery input is the effective approach for improving the regional MWP.The major grain producing areas of North and Northeast China should take measures to raise their MWP,ensure food security and the sustainable use of water resources.