太湖地区黄泥土壤水稻氮素利用与经济生态适宜施氮量

通过田间试验对不同施肥水平下太湖地区黄泥土壤水稻的氮肥吸收规律和氮肥利用效率进行了研究，并应用15N微区试验测定不同氮肥水平下氮肥损失数量。在此研究数据基础上，引入数学的微积分原理和环境经济学的Coase原理，对该地区水稻田氮肥施用的经济效益和环境效益进行评价，求得219~255 kg hm^-2为太湖地区黄泥土上目前生产条件下，兼顾生产、生态和经济三效益比较合理的水稻施肥量，相应的经济、生态适宜产量为8601～8662 kg hm^-2。

Investigation on the economically-ecologically appropriate amount of nitrogen fertilizer applied in rice production in Fe-leaching-Stagnic Anthrosols of the Taihu Lake region

The roles of nitrogen absorption and nitrogen utilization efficiency under different fertilizer rates were studied in a field experiment involving Taihu Lake region Fe-leaching-Stagnic Anthrosols. The 15N tracer technique was also employed to reliably calculate the amount of nitrogen loss. We measured rice yields, nitrogen utilization efficiencies, and the amounts of nitrogen loss under different levels of application of nitrogen fertilizer in the paddy field. The economic benefit and environmental benefit were evaluated with the data obtained from the experiment. In accordance with the calculus theory of mathematics and the Coase Theorem of Environmental Economics, the results showed that the ecologically and economically appropriate amount of nitrogen fertilizer for producing rice in this area was in the range: 219-255 kg hm^-2, and the corresponding economic and ecological yield was in the range: 8600-8661 kg hm^-2 using current agricultural production technology.