东祁连山灌-草群落交错带土壤呼吸动态及影响因子分析

doi:10.11686/cyxb2015019

摘要/Abstract

摘要： 为探究高寒灌-草交错带土壤呼吸动态及影响因素,应用LI-8100A土壤呼吸自动测定系统,对东祁连山典型灌丛-草地交错带土壤呼吸动态及土壤因子进行测定,分析呼吸速率与土壤因子的相互关系。结果表明,整个交错带内土壤呼吸速率的均值介于2.3~7.2 μmol/(m²·s),各样地间土壤呼吸速率大小顺序为珠芽蓼草甸中心(S₁)>草甸-金露梅灌丛交错区(MSC₁)>金露梅灌丛中心(S₂)>金露梅-杜鹃灌丛交错区(MSC₂)>杜鹃灌丛中心(S₃),S₁和MSC₁样地的土壤呼吸日变化呈单峰型,峰值出现在14:00,S₂、MSC₂、S₃样地峰型不明显,且日变幅较小,仅为0.3~1.1 μmol/(m²·s);交错带内土壤物理性质和养分储量呈明显的垂直分异规律,土壤呼吸速率与土壤温度、全磷储量呈极显著的正相关(P<0.01),与土壤含水量极显著负相关(P<0.01),与0~20 cm土壤有机碳储量呈显著负相关(P<0.05);拟合分析显示,土壤温度、含水量和全磷储量是土壤呼吸速率的主要限制因子,土壤呼吸与土壤温度拟合系数最高,可解释土壤呼吸空间变异的79.9%。

Abstract: This research explored the factors influencing soil respiration dynamics of an alpine Shrubland-Grassland ecotone. The soil respiration dynamics were measured using a LI-8100A automated soil CO₂ flux system, and relationship between soil respiration and soil factors was analysed for an eastern Qilian Mountain typical Shrubland-Grassland ecotone. The mean soil respiration rate was 2.3-7.2 μmol CO₂/(m²·s). The rankings of soil respiration rate at different sampling points were: Polygonum viviparum meadow center (S₁)>Polygonum viviparum meadow-Potentilla fruticosa shrub ecotone (MSC₁)>Potentilla fruticosa shrub center (S₂)>Potentilla fruticosa-Rhododendron shrub ecotone (MSC₂)>Rhododendron shrub center (S₃). The diurnal variation of soil respiration of S₁ and MSC₁ had a unimodal pattern, with the peak at 14:00. For S₂, MSC₂ and S₃ respiration rates were only 0.3-1.1 μmol CO₂/(m²·s) and the peak was not obvious. Soil physical properties showed a significant vertical gradation within ecotones. Soil respiration rate was significantly and positively correlated with soil temperature and total phosphorus (P<0.01), significantly negatively correlated with soil moisture (P<0.01), and significantly positively correlated with soil organic carbon in the 0-20 cm soil layer (P<0.05). Analysis of the relationship between soil respiration and soil temperature, soil moisture, total phosphorus, and organic carbon showed that soil temperature, soil moisture and total phosphorus were the main limiting factors for soil respiration rate. The highest fitted coefficient was soil temperature, which explained 79.9% of the spatial variability in soil respiration.

魏巍，周娟娟，曹文侠，徐长林. 东祁连山灌-草群落交错带土壤呼吸动态及影响因子分析[J]. 草业学报, 2015, 24(12): 1-9.

WEI Wei, ZHOU Juan-Juan, CAO Wen-Xia, XU Chang-Lin. Soil respiration dynamics and impact factor analysis of a shrubland-grassland ecotone in the Eastern Qilian Mountains[J]. Acta Prataculturae Sinica, 2015, 24(12): 1-9.

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