白桦人工林土壤各组分呼吸通量的变化特征

doi:10.11707/j.1001-7488.20131005

Abstract

Abstract:

A Li-8150 CO₂ flux meter was used to measure respiration efflux of the soil components in a Betula platyphylla plantation located in the Harbin experimental forest station of Northeast Forestry University. The diurnal and monthly variation characteristics of respiration efflux, as well as temperature sensitivity of each component were investigated. Results showed that: the diurnal variation of respiration efflux for all components presented single peak values. The diurnal variation range of litter respiration flux was far greater than that of mineral respiration, especially in spring and autumn. Root respiration showed greater diurnal fluctuation range in May and October, but smaller fluctuations in the other months. The proportion of respiration for each component fluctuated diurnally. Litter and root respiration presented the identical feature, that is, the fluctuation was greater in spring and autumn but smaller in summer. The mineral respiration efflux presented the opposite feature. The mean diurnal respiration of each component varied monthly, and was positively correlated with the monthly temperature. The proportion of respiration efflux for all components also showed significant variations in different seasons. Litter and root respiration had higher proportion in spring and summer but lower proportion in autumn, and mineral respiration flux presented higher proportion in spring and autumn but lower proportion in summer. The respiration of all components was more sensitive to the temperature in 10 cm depth soil than that at soil surface. Each component had different temperature sensitivity, that is litter > root > mineral. The monthly change of Q10 was greater in low temperature and smaller in high temperature.

Key words: Betula platyphylla plantation, respiration of litter, root respiration, mineral soil respiration, diurnal variation

CLC Number:

Meng Chun, Luo Jing, Pang Fengyan. Variation Characteristics of Respiration Efflux of Soil Components in Betula platyphylla Plantation[J]. Scientia Silvae Sinicae, 2013, 49(10): 28-34.

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Variation Characteristics of Respiration Efflux of Soil Components in Betula platyphylla Plantation

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