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首页> 外文期刊>Global Ecology and Conservation >Effects of three cropland afforestation practices on the vertical distribution of soil organic carbon pools and nutrients in eastern China
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Effects of three cropland afforestation practices on the vertical distribution of soil organic carbon pools and nutrients in eastern China

机译：三种农作造林实践对中国东部土壤有机碳库和营养素垂直分布的影响

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The conversion of croplands to plantations has been broadly implemented to mitigate climate change. This mitigation effect has been achieved mainly via the sequestration of COsub2/sub from the atmosphere and the storage of carbon within tree biomass and the soil, but this effect is not fully understood. To study this mitigation effect, a poplar plantation, a metasequoia plantation, and a poplar and metasequoia agroforestry system converted from croplands were studied. As such, we investigated the soil nutrient contents, soil organic carbon (SOC) fractions and SOC stocks in the three types of plantations to a depth of 100?cm. High total nitrogen, ammonium-nitrogen, and nitrate-nitrogen contents along the soil profile were detected in the poplar-based plantations. After 10 years of development, the poplar plantation had the greatest SOC fraction contents. The SOC stocks of the poplar plantation and poplar and metasequoia agroforestry system reached 90.35?Mg?hasup?1/sup and 98.12?Mg?hasup?1/sup, respectively. The 0–10, 10–20, and 20–40?cm soil layers accounted for a greater share of the SOC stock in the metasequoia plantation than in the other plantations, and the largest proportion of SOC stock in the poplar and metasequoia system was detected in the subsoil layers. Overall, the different afforestation practices resulted in different SOC accumulation patterns among soil depths, especially in the subsoil. The proportion of the SOC stock in the subsoil layers was greater in the agroforestry plantation than in the pure plantations.
机译：广泛实施农田对种植园的转换以减轻气候变化。这种缓解效果主要通过从大气和树木生物量和土壤中储存碳的CO 2 的封存来实现，但这种效果尚未完全理解。为研究这种缓解效果，研究了杨树种植园，唾液醌种植园和从农田转换的杨树和杨树和型杨树和态带和态带和态带农学生系统。因此，我们研究了三种种植园中的土壤营养物质，土壤有机碳（SoC）分数和SoC股，深度为100Ωcm。在杨树的种植园中检测到沿着土壤剖面的高总氮，氮和硝酸盐 - 氮含量。经过10年的发展，杨树种植园具有最大的SOC分数。杨树种植园和杨树和杨联血清制剂系统的SOC股，分别达到90.35Ω·毫克（MG）达到90.35毫克，分别达到90.35Ω·毫克，分别为98.12？ 0-10,10-20和20-40？CM土层占Mosquoia种植园中的SoC库存比其他种植园更大的份额，以及杨树和普通的系统中最大比例的SoC股票是在底层层中检测到。总体而言，不同的造林实践导致土壤深度不同的SOC累积模式，特别是在底层中。在纯种植园中，沙油层中SoC股票的比例大于纯种植园。

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