滇西北纳帕海高原湿地区域退化草甸土壤有机碳含量特征

发布时间：2018-06-10 01:40

本文选题：纳帕海 + 高原湿地　；参考：《环境科学研究》2017年07期

【摘要】：为了解气候变化和人类活动双重影响下纳帕海高原湿地区域有机碳含量特征,采用空间格网状抽样调查方法,对区域内退化系列下湿地草甸w(SOC)(SOC为土壤有机碳)特征进行研究.结果表明:(1)随着草甸的退化及土壤深度的增加,土壤含水量呈下降趋势,土壤容重呈增加趋势;(2)从无退化草甸到重度退化草甸,植被地上生物量从321.4 g/m~2降至142.1 g/m~2;(3)在地表至地下50 cm深度范围内,从无退化到重度退化草甸,w(SOC)分别为28.21、20.59、18.01、14.81 g/kg,湿地草甸退化导致w(SOC)下降了近50%,ρ(SOC)从40.92 kg/m~3降至25.23 kg/m~3;(4)狼毒草甸的w(SOC)、ρ(SOC)等均表现出相对较高的水平,仅次于无退化样地;(5)w(SOC)与土壤含水量呈显著正相关(P0.05)、与土壤容重呈显著负相关(P0.01).湿地草甸植被退化所形成的地上植被盖度及生物量的下降,以及土壤含水量的下降和土壤容重的增加,最终导致近50%左右的w(SOC)发生流失;此外,若从同类研究中季节性淹水的沼泽或沼泽化草甸转变为该研究中常年出露于水面的草甸景观后,在20 cm土壤深度内将导致45%以上的w(SOC)损失.
[Abstract]:In order to understand the characteristics of organic carbon content in wetland area of Napa Plateau under the dual influence of climate change and human activities, the characteristics of soil organic carbon (SOC) of wetland meadow in degraded series were studied by using spatial grid sampling method. The results showed that with the degradation of meadow and the increase of soil depth, soil water content decreased and soil bulk density increased. The aboveground biomass of vegetation decreased from 321.4 g/m~2 to 142.1 g / m ~ (2 +) in the depth of 50 cm from the surface to the ground. From non-degraded to severely degraded meadow, the WSOC was 28.21 ~ 20.59 ~ 18.01 ~ 14.81 g 路kg ~ (-1), and the degradation of wetland meadow resulted in a decrease of about 50, 蟻 ~ (SOC) from 40.92 kg/m~3 to 25.23 kg 路m ~ (3 / 3) 路kg ~ (3) 路kg ~ (-1) 路kg ~ (-1), respectively. There was a significant positive correlation between soil water content and a significant negative correlation between SOC and soil bulk density. The decrease of aboveground vegetation coverage and biomass, the decrease of soil water content and the increase of soil bulk density resulted in the loss of nearly 50% of WSOC, which resulted from the degradation of wetland meadow vegetation. If the seasonal flooded marsh or marsh meadow in the same study is transformed into the perennial meadow landscape in this study, the loss of WSOC will be more than 45% in the soil depth of 20 cm.
【作者单位】：西南林业大学环境科学与工程学院;
【基金】：国家自然科学基金项目(31360122) 云南省高校优势特色重点学科(生态学)建设项目
【分类号】：S812.2

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