華南丘陵區(qū)典型土地利用類型土壤呼吸日變化(參考版)
2024-08-28 08:28本頁面
【正文】 litter。h1 in the orchard. The lowest value of soil respiration rate appeared in December or January and the highest value appeared in June, July, August or October. It was proved that selecting 9:0011:00 as sampling time for each sampling day was suitable in Heshan hilly area according to the diurnal variation measurement．The effect of soil temperature to the diurnal variation of soil respiration rate was not obvious. Precipitation had great effect on soil respiration with higher value in rainy season than that in dry season. Vegetation types were another factor affecting soil respiration with higher value in the orchard than that in the pine plantation. The effect of litter to soil respiration was also not obvious. Key words: soil respiration。h1 in the pine plantation and ~ mg Biochemistry, 2004, 36:21112114.Diurnal variations of soil respiration of typical landuse types in a hilly area of South China.Liu Hui1, 2, Zhao Ping21. School of Tourism and Environment, Guangdong University of Business Studies, Guangzhou 510320, China；2. South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, ChinaAbstract: Diurnal variation of soil respiration was measured using dark static chambers for two consecutive years in two typical landuse types in a hilly area of South China: plantation dominated by Pinus massoniana and orchard dominated by Dimocarpus longan Lour. There were two plots at both sites respectively: one was covered with litters on the surface soil and the other had no litters. The result showed that the diurnal range of soil respiration rate at both sites was small but larger in the rainy season (AprilSeptember) than that in the dry season (OctoberMarch). There was no obvious rule of the peak value of soil respiration rate in the day and night. The average monthly soil respiration rate was in the range of ~ mgNELL B, et al. Fluxes of CO2, CH4 and N2O from drained organic soils in deciduous forests[J]. Soil Biology amp。圖3 針葉林和果園土壤溫度日變化Fig. 3 Diurnal variations of soil temperature in the pine plantation and orchardBS: Bare soil. SL: Soil with litter. (4) 凋落物對土壤呼吸的影響在不同月份不同植被下的影響有所不同，這可能是由于鶴山針葉林和果園的凋落物輸入量及其分解速率在不同季節(jié)有差異，或者是由于土壤的空間異質(zhì)性即微環(huán)境的差異超過了凋落物對土壤呼吸的影響造成的，這有待進一步研究。 (2) 無論針葉林或果園，2 h內(nèi) (9:0011:00)與同一天12 h內(nèi)（8:0018:00）或24 h 內(nèi)測定的土壤呼吸平均值之間接近，2 h測得的土壤呼吸平均值可用于估測12 h內(nèi)或24 h 內(nèi)的平均值。3 結(jié)論 (1) 針葉林和果園土壤呼吸日變化幅度不大，但相對于旱季而言，雨季日變化幅度比旱季要大, 土壤呼吸日變化最高值的出現(xiàn)無明顯的規(guī)律，不同月份峰值出現(xiàn)的時間有較大的差別，針葉林和果園都有峰值出現(xiàn)
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