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>

李昌珍，张婷婷，冯永忠，任广鑫，杨改河.不同轮作方式和秸秆还田对麦田土壤CO₂排放与水热碳氮状况和产量的影响[J].干旱地区农业研究,2013,31(6):190~197

不同轮作方式和秸秆还田对麦田土壤CO₂排放与水热碳氮状况和产量的影响

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

DOI：10.7606/j.issn.1000-7601.2013.06.033

中文关键词: 轮作方式秸秆还田 CO₂排放土壤温度土壤湿度有机碳碱解氮

英文关键词:rotation modes straw returning CO₂ emission flux soil temperature soil moisture soil organic carbon alkali-hydrolyzab

基金项目:十二五国家科技支撑计划项目（2011BAD15B03）；公益性行业（农业）科研专项“西北地区水土资源高效利用农作制”（201103001）

作者	单位
李昌珍^1,2，张婷婷^1,2，冯永忠^1,2，任广鑫^1,2，杨改河^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）

摘要点击次数: 1408

全文下载次数: 1092

中文摘要:

为探讨免耕条件下不同轮作方式秸秆还田对土壤CO₂排放的影响，本研究通过长期定位试验，采用GXH-3010E1型便携式红外线分析器测量土壤CO₂排放速率，对比研究冬小麦-夏闲、冬小麦-夏玉米和冬小麦-夏大豆在秸秆还田条件下土壤CO₂排放的动态变化及其与土壤温度、水分之间的回归关系，并分析比较土壤有机碳和碱解氮含量的变化。结果表明：三种轮作方式秸秆还田条件下冬小麦土壤CO₂排放具有明显的季节变化规律，平均CO₂排放通量表现为冬小麦-夏玉米全量还田>冬小麦-夏玉米不还田>冬小麦-夏大豆全量还田>冬小麦-夏大豆不还田>冬小麦-夏闲全量还田>冬小麦-夏闲不还田。所有处理土壤CO₂排放通量与土壤含水率和土壤温度均呈极显著正相关，秸秆未还田处理地温与CO₂排放通量的模拟模型要好于秸秆还田处理。各处理冬小麦收获后土壤有机碳和碱解氮含量均比播种前高，FA、FN处理有机碳增加最大，SA、SN碱解氮增加最大。

英文摘要:

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.

查看全文查看/发表评论下载PDF阅读器