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Litter decomposes slowly on shaded steep slope and sunny gentle slope in a typical steppe ecoregion
Ecology and Evolution ( IF 2.3 ) Pub Date : 2021-02-26 , DOI: 10.1002/ece3.6933 An Hu 1, 2 , Yaning Duan 1, 2 , Lei Xu 1, 2 , Shenghua Chang 1, 2 , Xianjiang Chen 1, 2 , Fujiang Hou 1, 2
Ecology and Evolution ( IF 2.3 ) Pub Date : 2021-02-26 , DOI: 10.1002/ece3.6933 An Hu 1, 2 , Yaning Duan 1, 2 , Lei Xu 1, 2 , Shenghua Chang 1, 2 , Xianjiang Chen 1, 2 , Fujiang Hou 1, 2
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Plant litter decomposition is mainly affected by litter properties and environmental factors, but the influence of terrain on litter decomposition is not well understood. We studied the effects of terrain on litter decomposition over a period of 12 months at six locations in a typical steppe ecoregion and measured the concomitant release of carbon (C), nitrogen (N), and phosphorus (P). The study site has two aspects, shaded and sunny, each aspect having three slopes: 15°, 30°, and 45°. The same mixed litter was used at each location to exclude the influence of litter quality variation. Results showed that soil temperature and moisture, solar radiation, and plant species diversity varied by terrain, which in turn, affected the k‐value (standardized total effects, 0.78, 0.12, 0.92, 0.23, respectively) and the release of C (0.72, –0.25, 0.83, 0.24, respectively), N (0.89, –0.45, 0.76, 0.40, respectively) and P (0.88, 0.77, 0.58, 0.57, respectively). K‐value and C release decreased with increasing slope on shaded aspect, while increased with increasing slope on sunny aspect. The release of N and P decreased with increasing slope on the shaded aspect. K‐value and C, N, and P release were significantly higher on shaded than that on sunny aspect at 15° and 30°, while at 45°, it was higher on sunny than on shaded aspect. The litter mass loss was slower on shaded 45° and sunny 15°. So moderate grazing or mowing could be used to reduce litter accumulation and accelerate litter decomposition on these terrains. Structural equation modeling indicated that soil temperature and solar radiation had the greatest influence on k‐value and C, N, and P release, and these two factors were directly related to soil moisture and plant species diversity. Overall, our results emphasize the need to consider terrain for litter decomposition in typical steppe ecoregions.
中文翻译：
典型草原生态区遮荫陡坡和向阳缓坡凋落物分解缓慢
植物凋落物分解主要受凋落物性质和环境因素的影响，但地形对凋落物分解的影响尚不清楚。我们在一个典型草原生态区的六个地点研究了 12 个月内地形对凋落物分解的影响，并测量了碳 (C)、氮 (N) 和磷 (P) 的伴随释放。研究地点有两个方面，阴影和阳光，每个方面都有三个坡度：15°、30°和45°。每个地点都使用相同的混合垫料，以排除垫料质量变化的影响。结果表明，土壤温度和湿度、太阳辐射和植物物种多样性因地形而异，进而影响k值（标准化总效应分别为 0.78、0.12、0.92、0.23）和 C 释放（0.72 、–0.25、0.83、0.24，分别），N（分别为 0.89、–0.45、0.76、0.40）和 P（分别为 0.88、0.77、0.58、0.57）。 K值和C释放量在阴坡上随坡度增大而减小，在向阳坡上随坡度增大而增大。 N和P的释放量随着阴影面坡度的增加而减少。 15°和30°时，阴面K值和C、N、P释放量显着高于阳面，而45°时，阳面高于阴面。阴影 45° 和阳光充足 15° 时，凋落物质量损失较慢。因此，适度放牧或割草可用于减少这些地形上的垃圾堆积并加速垃圾分解。 结构方程模型表明，土壤温度和太阳辐射对k值和C、N、P释放影响最大，这两个因素与土壤湿度和植物物种多样性直接相关。总的来说，我们的结果强调需要考虑典型草原生态区凋落物分解的地形。
更新日期：2021-03-21
中文翻译：
典型草原生态区遮荫陡坡和向阳缓坡凋落物分解缓慢
植物凋落物分解主要受凋落物性质和环境因素的影响，但地形对凋落物分解的影响尚不清楚。我们在一个典型草原生态区的六个地点研究了 12 个月内地形对凋落物分解的影响，并测量了碳 (C)、氮 (N) 和磷 (P) 的伴随释放。研究地点有两个方面，阴影和阳光，每个方面都有三个坡度：15°、30°和45°。每个地点都使用相同的混合垫料，以排除垫料质量变化的影响。结果表明，土壤温度和湿度、太阳辐射和植物物种多样性因地形而异，进而影响k值（标准化总效应分别为 0.78、0.12、0.92、0.23）和 C 释放（0.72 、–0.25、0.83、0.24，分别），N（分别为 0.89、–0.45、0.76、0.40）和 P（分别为 0.88、0.77、0.58、0.57）。 K值和C释放量在阴坡上随坡度增大而减小，在向阳坡上随坡度增大而增大。 N和P的释放量随着阴影面坡度的增加而减少。 15°和30°时，阴面K值和C、N、P释放量显着高于阳面，而45°时，阳面高于阴面。阴影 45° 和阳光充足 15° 时，凋落物质量损失较慢。因此，适度放牧或割草可用于减少这些地形上的垃圾堆积并加速垃圾分解。 结构方程模型表明，土壤温度和太阳辐射对k值和C、N、P释放影响最大，这两个因素与土壤湿度和植物物种多样性直接相关。总的来说，我们的结果强调需要考虑典型草原生态区凋落物分解的地形。
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