机构地区：[1]内蒙古师范大学地理科学学院,呼和浩特010022 [2]中国农业科学院农业资源与农业区划研究所,北京100081 [3]赤峰市农牧科学研究院,赤峰024031 [4]中国科学院植物研究所,北京京100093 [5]中国科学院大学,北京100049
出 处：《中国农业资源与区划》2022年第11期112-120,共9页Chinese Journal of Agricultural Resources and Regional Planning
基 金：“财政部和农业农村部:国家现代农业产业技术体系资助”;国家重点研发计划“草地和荒漠生态系统数据智能管理、产品开发和挖掘应用”(2021YFF0703904);国家重点研发计划“天然草原智能放牧与草畜精准管控关键技术”(2021YFD1300503);国家牧草产业技术体系项目(CARS-34)“农业科技创新联盟建设—农业基础性长期性科技工作”(NAES037SQ18);“蒙古国退化草地遥感监测与修复技术应用示范”(2017YFE0109100)。
摘 要：[目的]在全球气候变化背景下,研究天然草地和人工草地的温室气体通量以及与部分环境因子的相关关系,进而明确不同草地对温室气体通量的影响情况,为当地相关部门合理开发利用草地提供理论依据,推进草业绿色发展、高质量发展。[方法]文章以内蒙古自治区的阿鲁科尔沁旗选取退化的天然牧草地、混播型放牧人工草地以及刈割型人工牧草地为研究对象,利用目前较为普遍的箱法进行了野外实验,对比分析不同草地利用类型的主要温室气体CO_(2)、CH_(4)和N_(2)O的通量变化情况,并进一步探讨了温室气体与土壤含水量、箱内温度、地表温度以及其他土壤养分指标的相关性。[结果](1)不同利用方式下草地的CO_(2)通量在整个生长季均表现为排放,其中刈割人工草地的CO_(2)排放量为67.00±9.15 mg/(m^(2)·h),显著高于放牧人工草地35.50±5.37 mg/(m^(2)·h)和天然草地30.17±4.57 mg/(m^(2)·h)(P<0.05),且CO_(2)的通量与土壤含水量和温度呈正相关关系(P<0.05),此外还与土壤全碳、全氮及有机碳含量呈极显著负相关关系(P<0.01);(2) 3种草地类型的CH_(4)通量在整个生长季均表现为吸收,放牧人工草地的CH_(4)吸收量相对较低,为-19.10±4.24μg/(m^(2)·h),CH_(4)通量与土壤含水量和温度均未表现出显著的相关关系;(3)不同草地N_(2)O通量在整个生长季均表现为排放,退化的天然草地的N_(2)O通量在整个生长季表现最低,为11.62±5.96μg/(m^(2)·h),刈割人工草地的N_(2)O通量与箱内温度和土壤温度呈显著正相关关系(P<0.05)。[结论]可见人工草地的建立以及补播放牧等行为由于土壤含水量、箱内温度、地表温度以及土壤养分指标受到影响,进而不同程度上影响温室气体通量变化,人工草地的建立及放牧补播人工灌溉等人为干预会不同程度上增加CO_(2)和N_(2)O的排放量,此外,放牧会降低草地CH_(4)汇的功能。In the context of global climate change, this paper aims to study the greenhouse gas fluxes of naturalgrassland and artificial grassland and the correlation with some environmental factors, and clarify the impact ofdifferent grasslands on greenhouse gas fluxes, so as to provide a theoretical basis for the rational development andutilization of grassland by relevant local departments, and promote the green development and high-qualitydevelopment of grass industry.This study selected degraded natural grassland, mixed grazed artificial grassland, andmown artificial grassland through Ar Horqin Banner, Inner Mongolia Autonomous Region. In addition, it carriedoutfield experiments, andused the more common box method to compare and analyze the flux changes of the maingreenhouse gases CO_(2), CH_(4), and N_(2)O for different grassland utilization types, and further it explored the correlationbetween greenhouse gases and soil moisture content, box temperature, surface temperature and other soil nutrientindicators.The results were showed as follows.(1) The CO_(2)flux of grassland under different utilization methods wasshown as emissions throughout the growing season. The CO_(2)emissions from mown artificial grassland were 67.00±9.15 mg/(m^(2)·h), which was significantly higher than that of grazed artificial grassland 35.50±5.37 mg/(m^(2)·h) andnatural grassland 30.17±4.57 mg/(m^(2)·h)(P<0.05), and the flux of CO_(2) was positively correlated with soil watercontent and temperature(P<0.05). In addition, there was a very significant negative correlation with soil totalcarbon, total nitrogen and organic carbon content(P<0.01).(2) CH_(4)flux of the three grassland types were absorbedthroughout the growth season,the CH_(4)uptake of grazed artificial grassland was relatively low-19.10±4.24 μg/(m~2·h). CH_(4)flux had no significant correlation with soil water content and temperature.(3)The N_(2)O fluxes of differentgrasslands were emissions during the entire growing season. The N_(2)O fluxes of degraded natural grasslands
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
