CAJ | 학술논문

利用长期定位试验对下辽河平原农田生态系统、人工林生态系统和草地生态系统等土壤呼吸状况进行了分析,探讨了不同生态系统土壤呼吸强度的季节变化规律及其主要影响因素.结果表明:下辽河平原不同生态系统土壤呼吸强度季节动态变化趋势基本一致,土壤呼吸强度高峰首先出现在水、热条件适宜的夏季,而后在秋季由于有机物归还量增加,且水热条件亦较适宜的情况下再一次出现高峰;在农田生态系统中,施肥可明显增强土壤呼吸作用,两年平均土壤呼吸强度NPK+M与NPK分别比CK处理提高70%和40%;在草地生态系统中,有机物料归还和人类活动是影响土壤呼吸的主要因素,其强度变化顺序为:每年收获移出>荒地>裸地;人工林生态系统虽有一定有机物料输入,但其数量有限,呼吸强度低于农田生态系统和草地生态系统.
이용장기정위시험대하료하평원농전생태계통、인공림생태계통화초지생태계통등토양호흡상황진행료분석,탐토료불동생태계통토양호흡강도적계절변화규률급기주요영향인소.결과표명:하료하평원불동생태계통토양호흡강도계절동태변화추세기본일치,토양호흡강도고봉수선출현재수、열조건괄의적하계,이후재추계유우유궤물귀환량증가,차수열조건역교괄의적정황하재일차출현고봉;재농전생태계통중,시비가명현증강토양호흡작용,량년평균토양호흡강도NPK+M여NPK분별비CK처리제고70%화40%;재초지생태계통중,유궤물료귀환화인류활동시영향토양호흡적주요인소,기강도변화순서위:매년수획이출>황지>라지;인공림생태계통수유일정유궤물료수입,단기수량유한,호흡강도저우농전생태계통화초지생태계통.
Soil respiration is one of important sources of CO_2 emitted from biosphere to atmosphere. Based on a long-term monitor results, seasonal fluctuation and main influence factors of soil respiration with different ecosystems in the lower reaches of the Liaohe River plain were analyzed. The results showed that there was a similar seasonal pattern for soil respiration with different ecosystems. The first peak value was in summer with suitable hydrothermal condition, and the second was in autumn. Fertilization could increase soil respiration in agro-ecosystem and the highest soil respiration was in NPK+M treatment, followed by NPK, and the lowest in CK. Compared with CK treatment, soil respiration was increased by 70% and 40% for NPK+M and NPK treatments, respectively. Soil respiration in grass ecosystem was determined by the rate of organic materials returning and human activities. The changes of soil respiration intensity was mowing land>waste land>bare land. Although it had some residues backed to plantation ecosystem, soil respiration in plantation system was still lower than in agro-ecosystem and grass ecosystem.