• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文OA文献 >High heterotrophic CO2 emissions from a Malaysian oil palm plantations during dry-season
【2h】

High heterotrophic CO2 emissions from a Malaysian oil palm plantations during dry-season

机译：马来西亚油棕种植园在旱季期间产生的异养高二氧化碳排放量

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Background Tropical peatlands are currently being rapidly cleared and drained for the establishment of oil palm plantations, which threatens their globally significant carbon sequestration capacity. Large-scale land conversion of tropical peatlands is important in the context of greenhouse gas emission factors and sustainable land management. At present, quantification of carbon dioxide losses from tropical peatlands is limited by our understanding of the relative contribution of heterotrophic and autotrophic respiration to net peat surface CO2 emissions. Methods In this study we separated heterotrophic and autotrophic components of peat CO2 losses from two oil palm plantations (one established in ‘2000’ and the other in 1978, then replanted in ‘2006’) using chamber-based emissions sampling along a transect from the rooting to non-rooting zones on a peatland in Selangor, Peninsular Malaysia over the course of three months (June-August, 2014). Collar CO2 measurements were compared with soil temperature and moisture at site and also accompanied by depth profiles assessing peat C and bulk density. Results The soil respiration decreased exponentially with distance from the palm trunks with the sharpest decline found for the plantation with the younger palms. The mean heterotrophic flux was 1244.7 ± SE 149.2 mg m-2h-1 and 663.8 ± SE 102.2 mg m-2h-1 at the 2000 and 2006 plantations, respectively. Autotrophic emissions adjacent to the palm trunks were 944 ± SE 99.7 mg m-2h-1 and 1962 ± SE 246 mg m-2h-1 at the 2000 and 2006 plantations, respectively. Heterotrophic CO2 flux was positively related to peat soil moisture, but not temperature. Total peat C stocks were 60 kg m-2 (down to 1 m depth) and did not vary among plantations of different ages but SOC concentrations declined significantly with depth at both plantations but the decline was sharper in the second generation 2006 plantation. Conclusions The CO2 flux values reported in this study suggest a potential for very high carbon (C) loss from drained tropical peats during the dry season. This is particularly concerning given that more intense dry periods related to climate change are predicted for SE Asia. Taken together, this study highlights the need for careful management of tropical peatlands, and the vulnerability of their carbon storage capability under conditions of drainage.
机译：背景技术目前，热带泥炭地正在迅速清理和排水，以建立油棕种植园，这威胁了它们在全球范围内重要的碳固存能力。在温室气体排放因子和可持续土地管理的背景下，热带泥炭地的大规模土地转化很重要。目前，热带泥炭地二氧化碳损失的量化受到我们对异养和自养呼吸作用对泥炭净二氧化碳排放量的相对贡献的限制。方法在这项研究中，我们使用基于室的排放采样沿着来自两个油棕种植园的样地进行了分离，分离了两个油棕人工林的泥炭CO2损失的异养和自养成分。在三个月内生根到马来西亚半岛雪兰莪泥炭地的非生根区域（2014年6月至8月）。将领口的CO2测量值与现场的土壤温度和湿度进行比较，并伴随深度剖面评估泥炭C和堆积密度。结果土壤呼吸随着距棕榈树干距离的增加呈指数下降，其中年轻棕榈种植园的下降最为明显。 2000年和2006年人工林的平均异养通量分别为1244.7±SE 149.2 mg m-2h-1和663.8±SE 102.2 mg m-2h-1。在2000年和2006年的人工林中，靠近棕榈树干的自养菌排放量分别为944±SE 99.7 mg m-2h-1和1962±SE 246 mg m-2h-1。异养CO2通量与泥炭土壤水分呈正相关，但与温度呈正相关。泥炭C总储量为60 kg m-2（下降至1 m深度），在不同年龄的人工林中没有变化，但两种浓度下SOC的浓度均随深度的增加而显着下降，但在2006年第二代人工林中下降更为明显。结论该研究报告的CO2通量值表明，在干旱季节，热带枯竭泥炭可能会导致很高的碳（C）损失。鉴于东南亚地区预计将出现与气候变化有关的更干旱时期，这尤其令人担忧。综上所述，这项研究强调了对热带泥炭地进行仔细管理的必要性，以及在排水条件下其碳储存能力的脆弱性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号