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为向城市草坪的冬季管理提供科学依据,向城市生态系统的碳收支评估提供基础数据,研究了成都市最具代表性的两种城市草坪——沟叶结缕草草坪和麦冬草坪冬季土壤呼吸速率的动态变化及其影响因子.结果表明:沟叶结缕草草坪和麦冬草坪整个冬季土壤呼吸速率分别在1.20-3.17μmol m-2 s-1和0.85-2.43μmol m-2 s-1范围波动,且土壤呼吸动态均呈“V”型曲线,先降低后升高;冬季两种草坪土壤呼吸速率与土壤理化性质和植物生长习性有关;休眠期土壤呼吸速率主要受土壤温度调控,与土壤水分相关性不大;而双因素回归分析表明,温度和水分共同可解释土壤呼吸的75%-84%;沟叶结缕草草坪土壤呼吸温度敏感性(Q10)比麦冬草坪高41.85%.可见,两种草坪冬季休眠期土壤呼吸速率均较高,冬季土壤碳排放与草种选择有关.
In order to provide a scientific basis for the winter management of urban lawn and provide basic data for the evaluation of urban ecosystem carbon budget, the author studied two typical urban lawns in Chengdu, namely the lawn-ditch lawn and Ophiopogon lawn in winter The results showed that the soil respiration rates of Zoysia matrella and Ophiopogon japonicus were 1.20-3.17μmol m-2 s-1 and 0.85-2.43μmol m-2 s -1 range, and soil respiration dynamics showed “V” curve, first decreased and then increased; winter turf soil respiration rate and soil physical and chemical properties and plant growth habits; soil respiration rate was mainly affected by soil Temperature control, and soil moisture is not related to; and two-factor regression analysis shows that the temperature and moisture can explain 75% -84% of soil respiration; Zoysia tenuifolia grass soil respiration temperature sensitivity (Q10) The lawn height was 41.85% .It can be seen that the soil respiration rate of both lawns during winter dormancy was high, and the winter soil carbon emission was related to the selection of grass species.