不同轮作方式和秸秆还田对麦田土壤CO<sub>2</sub>排放与水热碳氮状况和产量的影响

李昌珍<sup>1; 2</sup>; 张婷婷<sup>1; 2</sup>; 冯永忠<sup>1; 2</sup>; 任广鑫<sup>1; 2</sup>; 杨改河<sup>1; 2*</sup>

Effects of different rotation modes and straw returning on soil CO₂ emission fluxes and moisture, heat, carbon and nitrogen conditions in wheat field

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DOI：10.7606/j.issn.1000-7601.2013.06.033

Key Words: rotation modes straw returning CO₂ emission flux soil temperature soil moisture soil organic carbon alkali-hydrolyzab

Author Name	Affiliation
LI Chang-zhen^1,2, ZHANG Ting-ting^1,2, FENG Yong-zhong^1,2, REN Guang-xin^1,2, YANG Gai-he^1,2*	（1.西北农林科技大学农学院，陕西杨凌 712100； 2.陕西省循环农业工程技术研究中心，陕西杨凌 712100）

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Abstract:

In order to explore the effect of different rotation modes and straw returning on soil CO₂ emission under no-till condition, GXH-3010E1 portable infrared analyzer was used to measure the soil CO₂ emission rate in a long-term field experiment. The dynamic variation of CO₂ emission fluxes under different rotation modes (winter wheat-summer fallow, winter wheat-summer maize, winter wheat-summer soybean) and the relationship between soil CO₂ emission and soil temperature as well as soil moisture were compared, and the changes of soil organic carbon and alkali-hydrolyzable nitrogen were analyzed. The results showed that the CO₂ emission fluxes fluctuated clearly with different seasons. The order of CO₂ emission fluxes were: winter wheat-summer maize and whole straw returning(MA)＞winter wheat-summer maize and no straw returning(MN)＞winter wheat-summer soybean and whole straw returning(SA)＞winter wheat-summer soybean and no straw returning(SN)＞winter wheat-summer fallow and whole straw returning (FA)＞winter wheat-summer fallow and whole straw returning(FN). There was highly significant positive relationship between soil CO₂ emission fluxes and soil temperature as well as soil moisture under all treatments, and the simulation models between soil temperature and CO₂ emission fluxes under no straw returning were better than those under straw returning. The contents of soil organic carbon and alkali-hydrolyzable nitrogen after harvesting of wheat increased, compared to those before seeding. The soil organic carbon was increased most under FA and FN, while the alkali-hydrolyzable nitrogen was increased most under SA and SN.