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首页> 外文期刊>農業気象 >Soil Carbon Content and Stable Isotope Ratio in Abandoned Agricultural Fields: Land Use Change from Paddy to Upland Grass in Higashi-Hiroshima, Japan
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Soil Carbon Content and Stable Isotope Ratio in Abandoned Agricultural Fields: Land Use Change from Paddy to Upland Grass in Higashi-Hiroshima, Japan

机译：废弃农业田地的土壤碳含量和稳定同位素比：日本东广岛县从稻田到旱地的土地利用变化

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摘要

The aim of this study was to investigate the cessation of cultivation act as a sink or source for belowground carbon pools in former paddy fields. We measured soil carbon content and stable carbon isotopic ratio (delta C-13) in three abandoned agricultural fields in Higashi-Hiroshima, Japan. The fields were located within 0.20 km of one another and had been abandoned for 2, 5, or 10 years (2Y, 5Y, MY fields). The cessation of cultivation of agricultural fields was dominated by C-4 photosynthetic type grass. The return of carbon in grass litters to the soil caused the soil delta C-13 to increase after abandoned; thus, the soil delta C-13 value was lowest in the 2Y field (-24.2 parts per thousand) and highest in the 10Y field (-22.1 parts per thousand). While the large root biomass in fields after the long-term cessation of cultivation is a potential source of carbon input into the soil, soil carbon content was lower in the fields abandoned for longer. Land use change (from paddy to upland grasses) may lead to a decrease in the soil carbon content in the fields after abandonment in this area.
机译：这项研究的目的是调查停止耕作作为以前稻田地下碳库的汇或源。我们测量了日本东广岛市三个废弃农田的土壤碳含量和稳定碳同位素比（δC-13）。这些字段彼此之间的距离为0.20公里，并且已被废弃2、5或10年（2Y，5Y，MY字段）。停止耕作的土地以C-4光合型草为主。草屑中的碳返回土壤后，土壤δC-13丢弃后增加。因此，土壤δC-13值在2Y田最低（-24.2千分之一），在10Y田最高（-22.1千分）。虽然长期停止耕种后田间大量的根系生物量可能是向土壤中输入碳的潜在来源，但弃耕时间较长的田地中土壤碳含量较低。土地利用变化（从稻田到高地草丛）可能会导致该地区废弃后田间土壤碳含量下降。

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