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A 15N dilution experiment was carried out to investigate effects of cultivation on the gross N transformation rate in coastal wetland zone. Microbial community composition was estimated by phospholipid fatty acid (PLFA) analysis and abundance of soil ammonia-oxidizing bacteria (AOB) was quantified by real-time polymerase chain reaction (PCR). Soil salinity(More)
Scientific interpretation of the mechanism of land use change is important for government planning and management activities. This study analyzes the land use change in Jiangsu Province using three land use maps of 2000, 2005 and 2008. The study results show that there was a significant change in land use. The change was mainly characterized by a continuous(More)
By linking DEA model to GIS technologies, this paper makes an empirical analysis about food production efficiency of 138 counties in Hebei Province from three aspects: total factor efficiency, technical efficiency and technological progress efficiency. The result shows that :1) The food production efficiency in Hebei Province grows rapidly during this(More)
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