藏东南色季拉山不同森林类型土壤CO2_排放

发布时间：2018-06-17 01:40

本文选题：色季拉山 + 森林土壤　；参考：《浙江农业学报》2017年10期

【摘要】：为阐明不同森林类型土壤碳排放变化特征及O层土壤对土壤碳排放的贡献,以藏东南色季拉山主要类型森林(冷杉、杜鹃、高山栎、云杉)为研究对象,设置移除和保留O层处理,分别测定其土壤碳排放量。结果表明:(1)供试的4种森林土壤均呈酸性(pH6.0),且随着土壤层次的加深pH值逐渐增大;(2)土壤温、湿度变化具有单峰型日变化特征,最大值均出现在12:00—14:00,最小值出现在8:00—9:00;日变化尺度上,土壤CO_2排放速率同样表现为单峰型日变化特征,4种森林类型土壤CO_2排放速率均表现为保留O层移除O层O层,不同处理土壤CO_2排放速率之间差异达极显著水平(P0.01);不同森林类型土壤累计碳通量变化特征与土壤CO_2排放速率变化规律基本一致。
[Abstract]:In order to elucidate the characteristics of soil carbon emissions in different forest types and the contribution of O layer soils to soil carbon emissions, the main types of forests (Abies fir, rhododendron, Quercus alpine, Picea) in Sejila Mountain, Southeast Tibet, were studied. Soil carbon emissions were measured by removing and retaining O-layer treatments. The results showed that the four forest soils were all acidic pH 6.0, and the variation of soil temperature and humidity showed single-peak diurnal variation with the increase of soil pH value. The maximum values appeared at 12: 00-14: 00, and the minimum appeared at 8: 00-9: 00. On the scale of diurnal variation, the CO2 emission rate of soil CO2 was also characterized by single-peak diurnal variation characteristics. The CO2 emission rates of four forest types showed that O layer was retained and O layer was removed. The difference of soil CO _ 2 emission rate among different treatments was very significant (P _ (0.01), and the variation characteristics of soil cumulative carbon flux in different forest types were basically consistent with soil CO _ (2) emission rate.
【作者单位】：西藏农牧学院西藏高原气候变化与土壤圈物质循环研究中心;西藏农牧学院高原生态研究所;
【基金】：国家自然基金项目(41461055,41561052) 西藏农牧学院“雪域英才工程”人才发展支持计划项目(XYYC2015-16) 研究生创新项目计划(YJS2016-7)
【分类号】：S714

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