短期增温和隔离降雨对杉木人工林土壤有效养分的影响
首发时间:2018-04-18
摘要:土壤养分循环在生态系统中起到至关重要的作用,为了探究未来气候变化下温度升高和降水改变对土壤养分循环的影响,我们在中国中亚热带杉木人工林进行增温和隔离降雨模拟试验,共设置对照(CT)、增温(W)、隔离降雨(P)和增温+隔离降雨(WP)4种处理。在这里,我们研究的指标主要是土壤基本理化性质和土壤有效养分,其中有效养分包括:铵态氮(NH4+-N)、硝态氮(NO3--N)、可溶性有机碳(DOC)、可溶性有机氮(DON)、微生物生物量碳(MBC)、微生物生物量氮(MBN)。结果表明:增温将显著增加NH4+-N和NO3--N,但却降低了土壤DON、DOC、MBN;隔离降雨处理降低了土壤MBN、DON、DOC;增温+隔离降雨交互处理显著增加了土壤NO3--N和MBC,但却大幅减少了DON、DOC、MBN。不同的土壤有效养分对升高温度和减少降水的响应机制各不相同,这可能是养分循环对气候变化的一种响应。
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Effects of short-term warming and precipitation exclusion on soil available nutrients in a Cunninghamia lanceolata plantation
Abstract:Soil nutrient cycling plays an important role in ecosystem. In order to investigate the effects of temperature rise and precipitation change on soil nutrient cycling in the future, we conducted a simulated experiment of warming and precipitation exclusion in a Cunninghamia Lanceolata forest ecosystem of Subtropical region. There were four treatments: control(CT), warming(W), precipitation exclusion(P) and warming plus precipitation exclusion(WP). Here, we measured the basic physicochemical characteristics of soils and the soil available nutrients. The available nutrients include: ammonium nitrogen (NH4+-N), nitrate nitrogen (NO3--N), dissolved organic carbon (DOC), dissolved organic nitrogen (DON), microbial biomass carbon (MBC), microbial biomass nitrogen (MBN). TEffects of short-term warming and precipitation exclusion on soil available nutrients in a Cunninghamia lanceolata plantationhe results show that: The increase of temperature significantly increased NH4+-N and NO3--N, but decrease the soil DON、DOC、MBN; The soil MBN, DON, and DOC were also reduced by the precipitation exclusion treatment. The interaction treatment of warming and precipitation exclusion clearly increased NO3--N and MBC, but the DOC and DON and MBN was decreased significantly. The response mechanism of soil available nutrients to increasing temperature and reducing precipitation is different, which may be a response of nutrient cycle to climate change.
Keywords: Warming Precipitation exclusion Soil available nutrients Cunninghamia Lanceolata Subtropica
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