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首页> 外文会议>International Soil Conservation Organization Conference vol.4; 20020526-31; Beijing(CN) >Using Nutrient Balance to Estimate Net C Balance in Landslide-Prone Pastoral Hill Country: Testing the 'Dynamic Equilibrium' Hypothesis in New Zealand Soft-Rock Landscapes
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Using Nutrient Balance to Estimate Net C Balance in Landslide-Prone Pastoral Hill Country: Testing the 'Dynamic Equilibrium' Hypothesis in New Zealand Soft-Rock Landscapes

机译：利用养分平衡估算滑坡-偏游牧区山地国家的净碳平衡：检验新西兰软岩景观的“动态平衡”假说

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摘要

Given recent negotiations of the Committee of Parties to the United Nations Framework Convention on Climate Change, soil C accumulation related to soil conservation efforts may be counted as C credits in national C balance calculations under the Kyoto Protocol. It has been proposed that in some instances, erosion can establish a dynamic equilibrium that results in a C sink corresponding to ongoing recovery of C in eroded soils combined with ongoing C accumulation in terrestrial sediments. Given this hypothesis, full accounting for erosion and soil conservation in the C budgets of dynamic landscapes may represent a significant challenge due to indirect effects of burial and nutrient dynamics on the balance of plant production and decomposition of soil organic matter (SOM). As a method for evaluating the 'dynamic equilibrium' hypothesis, we examine the burial and availability of eroded C and nutrients using a combination of field data and models. Landslides represent a model system for studying erosional effects on C and N dynamics because they offer the ability to study easily identifiable events representing a known proportion of the landscape. We therefore investigate the C and N balance of pastoral land on soft-rock landscapes in New Zealand that commonly undergo shallow landslides. Soil cores driven to the bedrock interface indicate that 23- and 37-year-old landslides have recovered to -50% and 72% soil C stock, respectively, when compared with cores from uneroded sites on similar slopes and aspects. Locally, this upland soil loss represents the removal of 36 Mg/ha—90 Mg/ha. However, a portion of the eroded C may be retained on land if landslide debris is not fully evacuated by streams, and the eroded C can also become buried in marine environments. To determine whether the net effect of erosion can represent a sink for atmospheric CO_2, we will combine the rate of upland soil C recovery with representations of the proportion of eroded C sequestered in sediments.
机译：鉴于《联合国气候变化框架公约》缔约方委员会最近进行的谈判，与土壤保护工作有关的土壤碳积累可算作《京都议定书》之下国家碳平衡计算中的碳信用。已经提出，在某些情况下，侵蚀可以建立一个动态平衡，从而导致一个C汇，这对应于侵蚀土壤中C的持续回收以及陆地沉积物中C的持续积累。在这种假设下，由于埋葬和养分动态对植物生产和土壤有机质分解（SOM）的平衡的间接影响，在动态景观的C预算中全面考虑侵蚀和土壤养护可能代表着重大挑战。作为评估“动态平衡”假设的一种方法，我们使用现场数据和模型的组合来检验被侵蚀的碳和营养物的掩埋性和可用性。滑坡代表了研究碳和氮动力学侵蚀影响的模型系统，因为它们提供了研究代表地形已知比例的容易识别的事件的能力。因此，我们调查了通常发生浅层滑坡的新西兰软岩景观上的牧草土地的碳氮平衡。与来自相似坡度和坡度的未侵蚀场地的岩心相比，被驱赶至基岩界面的土壤岩心表明，已有23年和37年历史的滑坡分别恢复了50％和72％的土壤C储量。在当地，这种旱地土壤流失表示清除量为36 Mg / ha-90 Mg / ha。但是，如果滑坡碎片没有被溪流完全排出，一部分被侵蚀的碳可能会保留在陆地上，并且被侵蚀的碳也可​​能被埋在海洋环境中。为了确定侵蚀的净效应是否可以代表大气中CO_2的汇，我们将结合旱地土壤C的回收率与沉积物中螯合的C的比例进行表示。

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