陇东黄土高原不同林龄刺槐林土壤碳通量及其组分特征

发布时间：2018-05-07 04:22

本文选题：土壤碳通量 + 林龄　；参考：《水土保持学报》2017年05期

【摘要】：基于红外气体分析技术,对陇东黄土高原田家沟水土保持科技示范园不同林龄(12,14,15,18a)刺槐林土壤碳通量进行定位监测,同时以荒草地为对照,分析土壤碳通量日、季变化及组分特征。结果表明:不同林龄刺槐林土壤碳通量日变化差异显著(P0.01),日变化趋势表现为昼高夜低的单峰曲线,13:00—15:00达到最大值,最小值出现在2:00—5:00;不同季节间土壤碳通量差异显著(P0.01),具体表现为夏季春季秋季冬季,夏季土壤碳通量为冬季的8.78~20.32倍;刺槐林春季土壤碳通量以自养呼吸为主,夏、秋两季以异养呼吸为主,冬季自、异养呼吸贡献率基本一样,荒草地春、夏、秋3季以异养呼吸为主,冬季与林地表现一致;刺槐林年土壤CO_2排放量随林龄增加而增加,年排放量2 069.63~4 590.35g/m~2,荒草地土壤CO_2年排放量2 806.27g/m~2,低于18a刺槐林,高于其余各林龄。研究结果为陇东黄土高原刺槐人工林土壤的固碳效应及经营措施提供依据。
[Abstract]:Based on infrared gas analysis technology, soil carbon fluxes of different forest ages in Tianjiagou soil and water conservation demonstration garden of Longdong Loess Plateau were monitored. The soil carbon fluxes of Robinia pseudoacacia forest were compared with that of barren grassland. Seasonal variation and component characteristics. The results showed that the diurnal variation of soil carbon flux in Robinia pseudoacacia stands of different ages was significantly different (P 0.01), and the diurnal variation trend was that the single peak curve of high day, high night and low night reached the maximum value, 13: 00-15: 00. The minimum value appeared at 2: 00-5: 00. The soil carbon fluxes in different seasons were significantly different (P0.01N), which showed that the soil carbon fluxes in summer, spring, autumn and summer were 8.78 ~ 20.32 times of that in winter, and the soil carbon fluxes of Robinia pseudoacacia forest in spring were mainly autotrophic respiration, summer, and summer, respectively. The contribution rate of heterotrophic respiration was basically the same in spring, summer and autumn. The annual CO_2 emission of Robinia pseudoacacia forest increased with the increase of forest age. The annual emission of CO_2 from grassland soil was 2 806.27 g / m ~ (2), which was lower than that of Robinia pseudoacacia forest for 18 years, and was higher than that of other forest ages. The results provided the basis for carbon sequestration effect and management measures of Robinia pseudoacacia plantation in Longdong Loess Plateau.
【作者单位】：甘肃省水土保持科学研究所;中国林业科学研究院荒漠化研究所;中国水利水电科学研究院泥沙研究所;
【基金】：甘肃省水利科研计划项目(2014-223-6)
【分类号】：S714

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