西土寒宪蚓和三叉苦植物对大叶相思人工林土壤CO2通量的短期效应

来源 :植物生态学报 | 被引量 : 0次 | 上传用户:wsw361
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
西土寒宪蚓(Ocnerodrilus occidentalis)为广东人工林和撂荒地内广泛分布的外来种蚯蚓,因其对水热、pH值及土壤有机质等的变化不敏感,其分布范围有逐渐扩大的趋势。研究西土寒宪蚓对人工林碳循环的影响过程,可以为如何减少外来蚯蚓影响下的人工林土壤碳排放提供思路。在广东鹤山大叶相思(Acacia auriculaeformis)人工林内设置外来蚯蚓和乡土植物野外控制实验,利用静态箱-气相色谱法对土壤CO2通量进行15天的原位测定。结果发现,单独添加西土寒宪蚓及单独种植三叉苦(Evodia lepta),对土壤CO2通量的效应都不明显。植物物理过程(如遮阴作用等)、植物生物过程(如根际化学物质分泌过程等)及植物在未添加蚯蚓样方和添加蚯蚓样方中对土壤CO2通量的效应分别为–32.1%、40.9%、8.8%和–7.2%、30.7%、23.5%。植物的物理过程抑制了土壤CO2排放,但提高了蚯蚓对土壤CO2排放的促进作用(提高了39.3%)。植物的生物过程促进了土壤CO2排放,但减弱了蚯蚓对土壤CO2排放的促进作用(降低了23.5%)。试验期间蚯蚓对多数土壤理化性质的影响并不明显,但是蚯蚓的存在有增强土壤细菌活性的趋势,而且使土壤CO2通量与土壤理化性质的相关性更加密切了;同时,蚯蚓的存在也使土壤CO2通量与土壤水热因子的关系发生了变化。可见,森林土壤CO2通量不仅与水热条件有关,还受地上和地下生物过程的调控。如果只关注森林土壤CO2通量的大小,而忽略影响土壤CO2产生及释放的生物学过程,将无法找到减少森林土壤CO2排放的有效途径。减缓人工林中土壤碳的排放,必须综合考虑植物物理过程、植物生物过程以及蚯蚓对土壤CO2排放过程的独立效应和交互效应。 Octelodrilus occidentalis, a widely distributed exotic species of earthworm in the plantation and abandoned land of Guangdong Province, is not sensitive to changes in water and heat, pH and soil organic matter, and its distribution range is gradually expanding. Studying the process of Eclipta imprisalus on carbon cycling in plantations can provide ideas for how to reduce soil carbon emissions under planted earthworms. Field control experiments of alien earthworms and native plants were set up in Acacia auriculaeformis plantation, and the soil CO2 fluxes were determined by in situ box-gas chromatography in situ for 15 days. The results showed that the effects of soil CO2 fluxes were not obvious when either alone or in combination with Evodia lepta alone. The effects of plant physical processes (such as shading, etc.), plant biological processes (such as rhizosphere chemical processes, etc.) and plant CO2 fluxes on soil without or with earthworm samples were -32.1% , 40.9%, 8.8% and -7.2%, 30.7% and 23.5% respectively. Phytoecological processes inhibited soil CO2 emissions, but increased the contribution of earthworms to soil CO2 emissions by 39.3%. Plant biological processes promote soil CO2 emissions but reduce the contribution of earthworms to soil CO2 emissions (down 23.5%). The influence of earthworms on the physico-chemical properties of most soils during the experiment was not obvious, but the existence of earthworms tended to increase the activity of soil bacteria, and the correlation between soil CO2 flux and soil physical and chemical properties was closer. At the same time, the presence of earthworms The relationship between soil CO2 flux and soil hydrothermal factors has changed. It can be seen that the soil CO2 fluxes are not only related to hydrothermal conditions, but also regulated by above and below biological processes. If we only focus on the amount of CO2 fluxes in forest soils and ignore the biological processes that affect the production and release of soil CO2, we will find no effective way to reduce CO2 emissions from forest soils. The mitigation of soil carbon emissions from plantations must take into account plant physical processes, plant biological processes and the independent and interactive effects of earthworms on soil CO2 emissions.
其他文献
外商直接投资(FDI)对于一个国家,特别是发展中国家的经济增长来说具有重要的作用。越南自2007年加入世贸组织以来,外商直接投资的规模呈现出逐渐扩大的趋势。外商直接投资是
回 回 产卜爹仇贱回——回 日E回。”。回祖 一回“。回干 肉果幻中 N_。NH lP7-ewwe--一”$ MN。W;- __._——————》 砧叫]们羽 制作:陈恬’#陈川个美食 Back to yield
土壤呼吸是土壤有机C矿化分解,释放无机养分的重要生物化学过程。本研究通过实验室培养的方法,分析了沙坡头地区人工固沙区不同固沙年限土壤碳矿化潜力的变化。经过103d的室
陈潭秋是中国共产党的创建者之一。中共六大以后,他先后两次到东北地区指导和主持中共满洲省委工作。在他的积极努力下,满洲省委的各级组织快速恢复和发展起来,推动了东北地
对房地产周期波动规律研究,不但关系着企业的效益与发展,同时影响着整个国民经济的发展和国计民生。运用系统动力学的理论与方法对房地产周期波动规律研究,采用定性与定量分
在大量收集七宝山矿区地质资料的基础上,作者对该矿区“铁帽型”与“铁锰黑土型”金银矿的异同特征进行了分析对比。
针对“一带一路”环境下我国对外新闻传播的研究,将从“一带一路”战略环境概述入手,结合“一带一路”环境下的新闻传播重点内容,对“一带一路”环境下我国对外新闻传播的问
目的:超声下应用电针不同波形刺激外金津及外玉液,观察颏舌肌收缩的即刻效应。方法:应用序贯试验设计,将14例健康受试者随机分为A、B两组,A组为先给予电针连续波(频率为30Hz)
回 回 产卜爹仇贱回——回 日E回。”。回祖 一回“。回干 肉果幻中 N_。NH lP7-ewwe--一”$ MN。W;- __._——————》 砧叫]们羽 制作:陈恬’#陈川个美食 Back to yield
【正】 随着我国人民环保意识的不断加强,大气污染综合治理日益深入,型煤的使用与人们的日常工作、生活、生产密切相关。JY220型蜂窝煤机是济南市机械研究所与济南开发区中燃