古尔班通古特沙漠南缘梭梭(Haloxylon ammodendron)群落土壤呼吸对生态系统呼吸的贡献

doi:10.7522/j.issn.1000-694X.2015.00037

摘要/Abstract

摘要：

土壤呼吸作为生态系统呼吸的主要贡献者,其贡献率往往超过50%,而干旱区土壤呼吸与生态系统呼吸的比值在季节上的变化尚不明确。利用涡度相关技术与多通道土壤呼吸观测技术,对古尔班通古特沙漠南缘的梭梭(Haloxylon ammodendron)群落生长季CO₂通量进行连续观测,探讨了土壤呼吸对生态系统呼吸的贡献及其在生长季变化特征。结果表明:(1)在整个生长季,生态系统呼吸呈单峰式变化,峰值出现在7月,为0.75 g·m^-2·d^-1;最小值出现在3月,为0.09 g·m^-2·d^-1;土壤呼吸在5-7月变化不大(0.34~0.51 g·m^-2·d^-1),7月底以后呈逐渐减小的趋势;(2)土壤呼吸与生态系统呼吸的比值(R_soil/R_eco)在整个生长季为0.38~0.98,平均0.67;季节变化上总体呈"U"型,即生长季初期和末期较高,而生长季中期较低;(3)R_soil/R_eco与梭梭同化枝生物量显著负相关(R²=0.458,P<0.05),说明随着梭梭同化枝生物量的增加,其对生态系统呼吸的贡献升高,导致了植物生长季中期R_soil/R_eco的下降。

关键词: 土壤呼吸, 生态系统呼吸, 二氧化碳通量, 涡度相关

Abstract:

Soil respiration (R_soil) typically performs as the main contributors to the annual total ecosystem respiration (R_eco) in ecosystem, but the seasonal variation of the R_soil/R_eco has not been investigated. The objective of this study was to investigate the characteristics of soil respiration and ecosystem respiration in a Haloxylon ammodendron community, located in the southern margin of Gurbantunggut Desert in western China. Special attention was paid on the seasonal variation of the R_soil/R_eco. The results showed that: (1) The R_eco was unimodal distribution during the whole growing season, the maximum R_eco was 0.75 g·m^-2·d^-1 and the minimum was 0.09 g·m^-2·d^-1. The R_soil was little changed during May to July (0.34-0.51 g·m^-2·d^-1), and began decreasing since the end of July. (2) The R_soil/R_eco ranged from 0.38 to 0.98, with an average of 0.67 across the whole growing season. On a seasonal basis, R_soil/R_eco presented an obvious "U" pattern: the value of R_soil/R_eco was 0.71 at the beginning of growing season; in the middle of growing season, the value of R_soil/R_eco reduced (about 0.43) as the plants into rapid growth period because of plants senesced; at the end of growing season, the R_soil/R_eco increased. (3) There was a significant linear correlation between the R_soil/R_eco and biomass of H.ammodendron assimilating twigs (R²=0.458, P<0.05), indicated that as the H.ammodendron growth, the contribution of H.ammodendron aboveground respiration (especially with leaf respiration) to R_eco also increased.

Key words: soil respiration, ecosystem respiration, carbon dioxide flux, eddy covariance

中图分类号:

S154.1

杨洁, 刘冉, 马杰, 唐立松, 李彦. 古尔班通古特沙漠南缘梭梭(Haloxylon ammodendron)群落土壤呼吸对生态系统呼吸的贡献[J]. 中国沙漠, 2016, 36(3): 726-733.

Yang Jie, Liu Ran, Ma Jie, Tang Lisong, Li Yan. The Contribution of Soil Respiration to Ecosystem Respiration of Haloxylon ammodendron Community in the South of Gurbantunggut Desert[J]. JOURNAL OF DESERT RESEARCH, 2016, 36(3): 726-733.

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