土地利用方式对高寒草甸生态系统土壤无机碳的影响

发布时间：2018-10-12 09:11

【摘要】：[目的]探明土地利用方式对高寒草甸生态系统土壤无机碳含量及储量的影响,为青藏高原区域碳增汇原理及草地管理实践提供科学支撑。[方法]选取围栏封育地、自由放牧地、多年生人工草地、补播地及黑土滩型退化草地5类不同土地利用类型,对无机碳的含量和储量、土壤主要理化性质的变化及其相关性进行比较分析。[结果]在高寒草甸生态系统中,无机碳含量较低且不同土地利用下土壤无机碳的储量(以C含量表示)有显著差异,表现为多年生人工草地(3 381.28kg/hm2)围栏封育地(739.27kg/hm2)自由放牧地(712.12kg/hm2)补播地(647.64kg/hm2)黑土滩型退化草地(361.26kg/hm2)。不同土地利用类型草地的土壤pH值、容重和含水量差异显著。土壤无机碳与土壤容重和含水量分别为线性正相关和负相关关系,与pH值为正相关关系,当pH值7时,无机碳含量很低,基本保持不变;当pH值7时,表现为指数函数关系。[结论]在高寒退化草地改良重建的技术与综合治理模式中,黑土滩型退化草地上建植多年生人工草地的管理策略在无机碳固定方面较其他措施更加有效,是维持草地碳汇功能的有效措施。
[Abstract]:[objective] to investigate the effects of land use patterns on soil inorganic carbon content and storage in alpine meadow ecosystem, and to provide scientific support for the principle of carbon sequestration in Qinghai-Tibet Plateau and the practice of grassland management. [methods] five types of land use types, including fenced land, free grazing land, perennial artificial grassland, replanted land and degraded grassland of black soil beach type, were selected, and the contents and reserves of inorganic carbon were analyzed. The changes of main physical and chemical properties of soil and their correlation were compared and analyzed. [results] in alpine meadow ecosystem, the content of inorganic carbon was relatively low and the soil inorganic carbon storage (expressed as C content) was significantly different under different land use. It is shown as perennial artificial grassland (3 381.28kg/hm2), fenced land (739.27kg/hm2), free grazing land (712.12kg/hm2), supplementary seeding land (647.64kg/hm2), degraded black soil grassland (361.26kg/hm2). There were significant differences in soil pH, bulk density and water content among different land use types. Soil inorganic carbon had linear positive and negative correlation with soil bulk density and water content, and positive correlation with pH value. When pH value was 7, inorganic carbon content was very low and remained unchanged, and when pH value was 7, it showed exponential function relationship. [conclusion] in the improvement and reconstruction of degraded alpine grassland, the management strategy of establishing perennial artificial grassland on degraded black soil grassland is more effective than other measures in inorganic carbon fixation. It is an effective measure to maintain the function of grassland carbon sink.
【作者单位】：中国科学院西北高原生物研究所;中国科学院大学;中国科学院成都生物研究所;
【基金】：青海省科技项目“基于植物功能性状的人工草地固碳牧草筛选”(2013-Z-941Q) 中国科学院战略性先导科技专项(XDA05070200) 国家科技支撑计划(2014BAC05B04) 中国科学院西北高原生物研究所知识创新工程领域前沿项目(2011)
【分类号】：S812.2

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