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2010年11月—2011年12月,研究了华西雨屏区31年生香樟人工林土壤表层(0~30 cm)细根生物量及碳储量.结果表明:香樟人工林土壤0~30 cm层细根总生物量(活根+死根)和碳储量的平均值分别为1592.29 kg·hm-2和660.68 kg C·hm-2,其中活细根贡献率分别为91.1%和91.8%.随着土壤深度的增加,香樟1~5级活细根和死细根的生物量及碳储量均显著减少;随着根序等级的升高,香樟活细根生物量及碳储量显著增加.香樟细根总生物量及碳储量均在秋季最高、冬季最低,死细根生物量及碳储量为冬季最高、夏季最低;1级根和2级根生物量及碳储量均在夏季最高、冬季最低,而3~5级根则为秋季最高、冬季最低.土壤养分和水分的空间异质性是导致细根生物量和碳储量变化的主要原因.
From November 2010 to December 2011, fine root biomass and carbon storage on the surface of the 31-year-old camphora plantation soil (0-30 cm) in rain-wet zone of Huaxi were studied.The results showed that the soil of 0-30 cm The average values of total fine root biomass (live root + dead root) and carbon storage were 1592.29 kg · hm-2 and 660.68 kg C · hm-2, respectively, of which the contribution rate of live fine root was 91.1% and 91.8% respectively. With the increase of soil depth, the biomass and carbon storage of fine root and dead fine root of 1 to 5 kinds of camphora were significantly reduced. With the increase of root order, the fine root biomass and carbon storage of camphora were significant Increased.The total biomass and carbon storage of fine root of camphora were the highest in autumn and the lowest in winter.The biomass and carbon storage of dead fine root were the highest in winter and the lowest in summer.The biomass and carbon storage of the first and second roots were in summer The highest in winter and the lowest in the third and fifth to the fifth and the lowest in winter.The spatial heterogeneity of soil nutrient and water content was the main reason for the change of fine root biomass and carbon storage.