关键词: 减氮补水, 冬小麦, 群体, 光合性能, 产量

Abstract: In this study, emergy theory and method was used to examine soil heavy metal pollution remediation. We integrated the disability-adjusted life method and evaluated the superior stabilizing amendment technology from the perspective of emergy value, to provide a basis for the optimization of soil heavy metal pollution remediation. A rice plantation field experiment was carried out on a lightly Cdpolluted farmland. The conventional plantation (CK) was set as the control, and lime (LI), sepiolite (SP), lime + sepiolite (LS), straw biochar (SC), organic fertilizer (OF) stabilizing amendments were set up, to analyze the emergy input and output, emergy loss rate and emergy sustainable development index of each system. Across the six treatments, the values of renewable organic emergy, total auxiliary emergy and total emergy input followed the trends: LS<CK<OF<LI<SP<SC. The fertilizer emergy value was mainly attributed to compound fertilizer. The nonrenewable resources were mainly attributed to soil phosphorus. The tendency of emergy output was presented as CK<SC<LI<SP<LS<OF. Compared with CK, stabilizing amendment increased emergy selfsufficiency rate, reduced emergy loss proportion, enhanced emergy inputoutput ratio, and decreased the damage to human health. On the whole, lime+sepiolite (LS) stabilizing amendment treatment was the best technology of pollution passivation and remediation with the best emergy value. To prevent the imbalance of soil nutrients caused by the application of passivation materials, it is necessary to properly apply potassium fertilizer, phosphate fertilizer and organic fertilizer. Meanwhile, we should pay more attention to the improvement of mechanical modernization, adhere to the production principle of “reduction, resource, and harmlessness”, reduce emergy input, and further increase the emergy input rate, reduce system environmental loading rate, and enhance the ability of sustainable development.

Key words: reduced nitrogen application and supplemental irrigation, winter wheat, population, photosynthetic characteristics, yield.