CAJ | 학술논문

采用CID-301PS光合分析仪(配带土壤呼吸室),对湖南会同林区毛竹林地土壤呼吸进行测定,结果表明,毛竹林地土壤总呼吸速率、异养呼吸速率、自养呼吸速率及凋落物呼吸速率的年平均值分别为2.13、1.44、0.69μmol CO_2·m~(-2)·s~(-1)和0.31μmol CO_2·m~(-2)·s~(-1),并呈现明显的季节变化规律和日变化规律,季节变化曲线呈单峰型,表现为1～7月份随着气温、地温的升高呈上升的趋势,在8月达年呼吸速率的最大值,分别达4.95、3.01、1.94μmol CO_2·m~(-2)·s~(-1)和0.80 μmolCO_2·m~(-2)·s~(-1),此后随温度的降低而呈逐渐递减的趋势,直到翌年的1月份或2月份,分别为0.76、0.70、 0.06μmolCO_2·m~(-2)·s~(-1) 和 0.05μmolCO_2·m~(-2)·s~(-1).日变化曲线图表现为单峰形态,一般也是随着温度的升高而加大,随着温度的降低而减小.6:00～14:00,随着土壤温度的升高而增加,一般在16:00～18:00出现最高峰,此后,一直递减,直到次日4:00～8:00.由此计算出毛竹林地土壤年释放CO_2量为33.94 t·hm~(-2)·a~(-1),其中,林地异养呼吸、自养呼吸和凋落物呼吸分别占总呼吸的59.5%、28.3%和12.2%.
채용CID-301PS광합분석의(배대토양호흡실),대호남회동림구모죽임지토양호흡진행측정,결과표명,모죽임지토양총호흡속솔、이양호흡속솔、자양호흡속솔급조락물호흡속솔적년평균치분별위2.13、1.44、0.69μmol CO_2·m~(-2)·s~(-1)화0.31μmol CO_2·m~(-2)·s~(-1),병정현명현적계절변화규률화일변화규률,계절변화곡선정단봉형,표현위1～7월빈수착기온、지온적승고정상승적추세,재8월체년호흡속솔적최대치,분별체4.95、3.01、1.94μmol CO_2·m~(-2)·s~(-1)화0.80 μmolCO_2·m~(-2)·s~(-1),차후수온도적강저이정축점체감적추세,직도익년적1월빈혹2월빈,분별위0.76、0.70、 0.06μmolCO_2·m~(-2)·s~(-1) 화 0.05μmolCO_2·m~(-2)·s~(-1).일변화곡선도표현위단봉형태,일반야시수착온도적승고이가대,수착온도적강저이감소.6:00～14:00,수착토양온도적승고이증가,일반재16:00～18:00출현최고봉,차후,일직체감,직도차일4:00～8:00.유차계산출모죽임지토양년석방CO_2량위33.94 t·hm~(-2)·a~(-1),기중,임지이양호흡、자양호흡화조락물호흡분별점총호흡적59.5%、28.3%화12.2%.
The dynamics of CO_2 concentration in Moso bamboo(Phyllostachys edulis) plantation was studied with CID-301 portable photosynthesis system in Huitong County, Hunan Province. The results showed that the soil total respiration rate, heterotrophic respiration rate, autotrophic respiration rate and litter annual respiration rate of Moso bamboo plantation were 2.13, 1.44, 0.69 and 0.31 μmol CO_2·m~(-2)·s~(-1), respectively. It was obvious that soil respiration rate exhibited strongly annual and daily dynamic pattern in Moso bamboo plantation. The annual dynamic pattern was represented with a single-peak curve. The respiration rates increased with increasing atmospheric and soil temperature from January to July. Total soil total respiration rate, heterotrophic respiration rate, autotrophic respiration rate and litter respiration rate reached their highest values in August, being 4.95, 3.01, 1.94 and 0.80 mol CO_2·m~(-2)·s~(-1), respectively. All of these respiration rates discreased gradually with falling temperature from August to January or February in the next year. At this time, the respiration rates reached their lowest values, which were 0.76, 0.70, 0.06 and 0.05 μmol CO_2·m~(-2)·s~(-1), respectively. The daily variation of total soil respiration rate, heterotrophic respiration rate, autotrophic respiration rate and litter respiration rate of Moso bamboo plantation could also be represented with a single-peak curve. They usually showed a strong consistency with temperature. From 6:00 to 14:00, the respiration rates increased with increasing temperature, and reached the highest value from 16:00 to 18:00. After this time, they decreased until the time from 4:00 to 8:00 in next day. The amount of CO_2 released from Moso bamboo plantation was 33.94t CO_2·hm~(-2)·a-1, including 59.5% heterotrophic respiration, 28.3% autotrophic respiration and 12.2% litter respiration.