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Subsidence and carbon dioxide emissions in a smallholder peatland mosaic in Sumatra, Indonesia.
Mitigation and Adaptation Strategies for Global Change ( IF 4 ) Pub Date : 2018-03-21 , DOI: 10.1007/s11027-018-9803-2
Ni'matul Khasanah 1, 2 , Meine van Noordwijk 1, 2
Affiliation  

Most attention in quantifying carbon dioxide (CO2) emissions from tropical peatlands has been on large-scale plantations (industrial timber, oil palm (Elaeis guinensis)), differing in drainage and land-use practices from those of smallholder farms. We measured subsidence and changes in bulk density and carbon organic content to calculate CO2 emissions over 2.5 years in a remnant logged-over forest and four dominant smallholder land-use types in Tanjung Jabung Barat District, Jambi Province, Sumatra, Indonesia: (1) simple rubber (Hevea brasiliensis) agroforest (> 30 years), (2) mixed coconut (Cocos nucifera) and coffee gardens (Coffea liberica) (> 40 years), (3) mixed betel nut (Areca catechu) and coffee gardens (> 20 years), and (4) oil palm plantation (1 year). We quantified changes in microtopography for each site for greater accuracy of subsidence estimates and tested the effects of nitrogen and phosphorus application. All sites had a fibric type of peat with depths of 50 to > 100 cm. A recently established oil palm had the highest rate of peat subsidence and emission (4.7 cm year−1 or 121 Mg CO2 ha−1 year−1) while the remnant forest had the lowest (1.8 cm year−1 or 40 Mg CO2 ha−1 year−1). Other land-use types subsided by 2–3 cm year−1, emitting 70–85 Mg CO2 ha−1 year−1. Fertilizer application did not have a consistent effect on inferred emissions. Additional emissions in the first years after drainage, despite groundwater tables of 40 cm, were of the order of belowground biomass of peat forest. Despite maintaining higher water tables, smallholder landscapes have CO2 emissions close to, but above, current IPCC defaults.

中文翻译:

印度尼西亚苏门答腊一个小农的泥炭地马赛克中的沉降和二氧化碳排放量。

量化热带泥炭地二氧化碳(CO 2)排放量时,最受关注的是大型种植园(工业木材,油棕(Elaeis guinensis)),排水方式和土地使用方式与小农户不同。我们测量了印度尼西亚苏门答腊占碑省丹戎贾本巴拉特地区剩余的砍伐森林和四种主要小农土地利用类型在2 .5年内的沉降和体积密度和碳有机含量的变化,以计算CO 2排放量:(1 )简单橡胶(巴西橡胶树)农林(> 30年),(2)混合椰子(Cocos nucifera)和咖啡园(Coffea liberica)(> 40年),(3)混合槟榔(槟榔和咖啡园(> 20年),以及(4)油棕种植(1年)。我们对每个站点的微观形貌变化进行了量化,以提高沉降估算的准确性,并测试了施氮和磷的效果。所有部位的纤维类型均为泥炭,深度为50至100 cm。最近建立的油棕的泥炭沉降和排放速率最高(4.7 cm年-1或121 Mg CO 2  ha - 1 年-1),而残留的森林最低(1.8 cm年-1或40 Mg CO 2)。  ha - 1 年-1)。其他土地利用类型在- 1年减少了2–3 cm ,排放出70-85 Mg CO2 公顷- 1 年-1。施肥对推断的排放量没有持续的影响。尽管地下水位为40 cm,但排水后头几年的额外排放量约为泥炭林地下生物量。尽管维持较高的地下水位,但小农户的CO 2排放量接近或高于当前IPCC的默认值。
更新日期:2018-03-21
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