| 减量施氮与间作大豆对蔗田碳平衡特征的影响 |
| |
| 引用本文： | 管奥湄,章 莹,刘 宇,罗莎莎,王建武.减量施氮与间作大豆对蔗田碳平衡特征的影响[J].中国生态农业学报,2016,24(4):478-488. |
| |
| 作者姓名： | 管奥湄 章 莹 刘 宇 罗莎莎 王建武 |
| |
| 作者单位： | 华南农业大学热带亚热带生态研究所/农业部华南热带农业环境重点实验室/华南农业大学广东省高等学校农业生态与农村环境重点实验室广州510642 |
| |
| 基金项目： | 国家重大基础研究计划(973计划)项目(2011CB100400)、国家科技支撑计划项目(2012BAD14B16-04)和广东省科技计划项目(2012A020100003)资助 |
| |
| 摘 要： | 为了研究氮肥投入及豆科作物间作对蔗田碳汇的影响,通过2年(2012—2013年)的大田试验,采用投入产出平衡法(即将作物生育期内的碳投入与碳产出进行量化分析),探讨2个蔗田施氮水平300 kg·hm?2(减量施氮)和525 kg·hm?2(常规施氮)]和4种种植模式(甘蔗单作、大豆单作、甘蔗||大豆1行︰1行间作及甘蔗||大豆1行︰2行间作)下蔗田生态系统碳的输入和输出特征。结果表明,两种施氮处理甘蔗||大豆1︰2间作模式碳输入量均显著高于甘蔗单作和甘蔗||大豆1︰1间作模式。2012年减量施氮处理甘蔗||大豆1︰2间作模式碳输出量显著低于甘蔗单作和甘蔗||大豆1︰1间作模式,2013年差异不显著;甘蔗收获后,减量施氮处理甘蔗||大豆两种间作模式土壤碳截存量均显著高于甘蔗单作。甘蔗||大豆间作生态系统的碳收支与平衡分析表明,减量施氮处理甘蔗||大豆1︰2间作模式净碳固定量2012年为2 956.35 kg·hm?2,2013年为872.59 kg·hm?2。减量施氮处理甘蔗||大豆1︰2间作模式下农田固碳潜力大于其他处理,从农业可持续发展角度考虑,该模式具有一定的生态合理性。
|
| 关 键 词： | 甘蔗 大豆间作 减量施氮 碳输入 碳输出 碳平衡 农田固碳 |
| 收稿时间： | 2015/8/31 0:00:00 |
| 修稿时间： | 2015/12/11 0:00:00 |
Effects of reduced nitrogen application and sugarcane-soybean
intercropping on carbon balance in sugarcane fields |
| |
| GUAN Aomei,ZHANG Ying,LIU Yu,LUO Shasha and WANG Jianwu.Effects of reduced nitrogen application and sugarcane-soybean
intercropping on carbon balance in sugarcane fields[J].Chinese Journal of Eco-Agriculture,2016,24(4):478-488. |
| |
| Authors: | GUAN Aomei ZHANG Ying LIU Yu LUO Shasha and WANG Jianwu |
| |
| Institution: | Institute of Tropical and Subtropical Ecology, South China Agricultural University / Key Laboratory of Agro-Environment in the Tropics , Ministry of Agriculture / Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, South China Agricultural University, Guangzhou 510642, China,Institute of Tropical and Subtropical Ecology, South China Agricultural University / Key Laboratory of Agro-Environment in the Tropics , Ministry of Agriculture / Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, South China Agricultural University, Guangzhou 510642, China,Institute of Tropical and Subtropical Ecology, South China Agricultural University / Key Laboratory of Agro-Environment in the Tropics , Ministry of Agriculture / Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, South China Agricultural University, Guangzhou 510642, China,Institute of Tropical and Subtropical Ecology, South China Agricultural University / Key Laboratory of Agro-Environment in the Tropics , Ministry of Agriculture / Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, South China Agricultural University, Guangzhou 510642, China and Institute of Tropical and Subtropical Ecology, South China Agricultural University / Key Laboratory of Agro-Environment in the Tropics , Ministry of Agriculture / Key Laboratory of Agroecology and Rural Environment of Guangdong Regular Higher Education Institutions, South China Agricultural University, Guangzhou 510642, China |
| |
| Abstract: | Intercropping has an outstandingly long history in China. Studies have reported several advantages of cereal- legume intercropping systems, including increased yields, land use efficiency, natural resources utilization, and pest anddiseasecontrol.Thishasahugepotentialtosignificantlycontributetothesustainabilityofmodernagriculture.Ascerealcrop,sugarcaneisamajoreconomiccropusedintheproductionofsugarinChina.Itswide-rowplantingspaceandslowgrowthrateduring initial growth stage provide the required niche of space and resources for intercropping. However, long-termmono-cropping of sugarcane along with the overuse of nitrogen fertilizer has induced severe nitrous pollution in theenvironmentandhighcostofagriculturalproductioninSouthChina.Sugarcane-soybeanintercroppingcanreducenitrogenapplication while maintaining high crop yield, in turn reducing the overall cost of farming, enriching soil fertility andenhancing soil carbon sequestration in the field. However, few studies have investigated carbon balance under sugarcaneintercropping and carbon sequestration in sugarcane intercropping fields. The objective of this study was to determine theeffectsofsugarcaneandsoybeanintercroppingunderreducednitrogenfertilizeronsoilcarbonbalance.Thisstudywillfurtherstrengthenthescientificbasisfortheuptakeandutilizationofsoilnutrientandtherelationshipsamongnutritionutilizationandenvironmentalfactorsunderintercroppingsystems.Tothatend,afieldexperimentwasconductedin2012–2013inSouthChina Agriculture University. The study analyzed carbon balance and sequestration in farmlands in sugarcane-soybeanintercropping systems with crop line ratio of 1︰1, sugarcane-soybean intercropping systems with crop line ratio of 1︰2,monocroppedsugarcane(MS)undertwonitrogenlevels(N1,300kg·hm-2andN2,525kg·hm-2)andmonocroppedsoybeanunderzeronitrogensupplyduringcropgrowthseason.Carbonbalanceandsequestrationinfarmlandsoilswereinvestigatedinthis study using Input-Output Analysis, where carbon input and output were quantified for crop growth period in order todeterminetheintensityofcarbonsink.Theresultsshowedthatcarboninputundersugarcane-soybean(1︰2)intercroppingsystemwassignificantlyhigherthanthatundermonoculturesugarcaneandsugarcane-soybean(1︰1)intercroppingundertwonitrogenapplicationlevels.Comparedwithsugarcane-soybean(1︰1)intercroppingandmonoculturesugarcane,carbonoutputunder sugarcane-soybean (1︰2) intercropping was significantly decreased with reducing nitrogen application in 2012,althoughtherewasnosignificantdifferencein2013.Afterharvestingsugarcane,soilcarbonstorageundersugarcane-soybeanintercropping systems with reduced nitrogen application was significantly higher than that under monoculture sugarcane.Carbonbudgetanalysisforsugarcane-soybeanintercroppingsystemsshowedthatsugarcane-soybean(1︰2)intercroppingwasagoodnetcarbonsinkwithhighcarbonfixationof2956.35kg·hm-2in2012,and872.59kg·hm-2in2013underreducednitrogenapplicationconditions.Itwasnotedthatsugarcane-soybean(1︰2)intercroppingwithreducednitrogenapplicationhadbettercarbonstoragepotential.Inaddition,thevalueoflandequivalentratio(LER)ofsugarcane-soybeanintercroppingsystemsexceeded1.0in2012and2013.AlsoLERofsugarcane-soybean(1︰2)intercroppingsystemwithreducednitrogenapplication was higher than 1.0. In conclusion, sugarcane-soybean intercropping system (1︰2) with reduced nitrogenapplicationwasafeasibleproductionmodeforthesustainabilityofmodernagriculture. |
| |
| Keywords: | Sugarcane-soybean intercropping Reduced nitrogen application Carbon input Carbon output Carbon balance Soil carbon sequestration |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
| 点击此处可从《中国生态农业学报》浏览原始摘要信息 |
| 点击此处可从《中国生态农业学报》下载免费的PDF全文 |
|
