| 农垦与放牧对内蒙古草原N2O、CO2排放和CH4吸收的影响 |
| 摘要点击 1918 全文点击 1842 投稿时间：2000-11-08 |
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| 中文关键词 农垦 放牧 草原 温室气体 大气环境 |
| 英文关键词 cultivating grazing grassland N2O and CO2 emission CH4 uptake |
| 作者 | 单位 | | 王跃思 | 中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室,北京,100083 | | 纪宝明 | 中国科学院植物研究所,北京,100093 | | 黄耀 | 中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室,北京,100083 | | 胡玉琼 | 中国科学院大气物理研究所大气边界层物理和大气化学国家重点实验室,北京,100083 | | 王艳芬 | 中国科学院植物研究所,北京,100093 |
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| 中文摘要 |
| 利用优选静态箱/气相色谱法(GC),首次对我国内蒙古草原典型地区进行了人类活动对N2O、CO2和CH4交换通量影响的实验观测结果表明,农垦麦田N2O平均排放通量比原始草原高出3倍,并改变了草甸草原为CO2汇的性质,使其季节排放净通量以C计增加14.3 mg·(m2·h).随放牧强度的增加CO2排放通量呈线性增长,轻牧会引起草原对CH4吸收的大幅增加,而随着放牧压力的增大,增加值迅速回落.农垦麦田与草甸草原相比地-气间CH4交换无显著变化,放牧强度对N2O排放影响无显著规律.土壤湿度和温度是影响草原排放N2O和CO2、吸收CH4季节变化形式的关键因子,而人类活动仅影响排放强度.排放和吸收量年际间差异很大,但主要受降水的影响.N2O和CO2排放与CH4吸收峰值相反现象普遍存在. |
| 英文摘要 |
| Measurement of N2O, CO2 and CH4 with the optimized closed chamber/GC technique in the typical grassland, which were influenced by human activities, grazing and cultivating first time in situ were carried out in Inner Mongolia of P. R. China from 1998 to 1999. It was found that wheat cropping can increase N2O production 3 times than the native, and changed a CO2 sink of Inner Mongolia Steppe to a significant source, increased efflux CO2 (C)average 14.3 mg·(m2·h)-1 from Jun. to Dec. in 1998. CH4 uptake was highly increased if there was grazing lightly. There were no effects of wheat cropping on CH4 uptake and no significant results of grazing on N2O emission. Soil moisture and temperature were the key factors ,other than human activities, which affect the patterns of seasonal variation of N2O and CO2 emission and CH4 uptake. Highly inter annual variations,which resulted from the annual precipitation, of the exchange fluxes and seasonal variation patterns of N2O and CO2 emission and CH4 uptake there were. It was a fact that N2O and CO2 emission from the soils was inversely related to CH4 uptake. |
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