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首页> 外文期刊>Agriculture, Ecosystems & Environment: An International Journal for Scientific Research on the Relationship of Agriculture and Food Production to the Biosphere >Re-introduction of light grazing reduces soil erosion and soil respiration in a converted grassland on the Loess Plateau, China
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Re-introduction of light grazing reduces soil erosion and soil respiration in a converted grassland on the Loess Plateau, China

机译：重新引入光草在黄土高原的转化草原上降低了土壤侵蚀和土壤呼吸

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摘要

Prohibition of grazing has significantly reduced soil erosion and enhanced soil organic carbon (SOC) stock on the Loess Plateau. However, this practice has reduced livestock production and consequently decreased herders' income in the region. In this study, light grazing was therefore re-introduced to investigate effects of converting cropland to grassland on soil erosion and CO2 emission under light grazing practice. The light grazing trials (10 adult sheep grazing to 7-8 cm of the initial grass height in 1530 m(2) land area) were conducted, where soil loss, SOC erosion and CO2 emission were measured using Be-7 technique and Li-COR Automated Soil CO2 Flux System. Soil and SOC erosion were 60% and 56% lower in the light grazed grassland and 46% and 29% lower in the un-grazed grassland when compared with cropland, respectively. Light grazing and un-grazing practices increased soil CO2 emission by 15% and 33% respectively, relative to cropland. The mechanisms to control soil erosion by light grazing and un-grazing practices were similar, and governed by grass root biomass and near surface vegetation coverage. However, light grazing had higher potential than un-grazing practices in reducing Soil and SOC erosion and CO2 emission. Our results highlight the potential of light grazing in reducing soil erosion in the "Grain for Green" grassland ecosystems to achieve the dual goals of ecological and economic gains, and sustainability in China and elsewhere.
机译：禁止放牧在黄土高原上的土壤侵蚀和增强土壤有机碳（SoC）股上有显着降低。然而，这种做法降低了畜牧业生产，因此降低了该地区的牧民收入。因此，重新引入了光放牧，调查将农田转化为草地对土壤侵蚀和二氧化碳排放的影响。采用光放牧试验（10个成年羊在1530米（2）陆地面积中占据了初始草高的7-8厘米），其中使用BE-7技术测量土壤损失，SOC腐蚀和二氧化碳排放量和LI- COR自动化土二氧化碳磁通系统。浅层草地的土壤和SoC侵蚀分别为60％，在浅层草地上较低56％，而在未占地的草地上分别与农田相比，在未放牧的草地上较低的46％和29％。光放牧和未放牧实践相对于农田分别增加了15％和33％的土壤二氧化碳排放量。通过轻微放牧和未放牧实践控制土壤侵蚀的机制是相似的，并受草根生物量和近地表植被覆盖的管辖。然而，在减少土壤和SOC侵蚀和二氧化碳排放的情况下，光放牧比未放牧实践具有更高的潜力。我们的结果突出了轻微放牧在减少“绿色”草原生态系统中的土壤侵蚀中的光线侵蚀，实现生态和经济收益的双重目标，以及中国和其他地方的可持续发展。

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