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首页> 外文期刊>Agricultural and Forest Meteorology >Impacts of land use and plant characteristics on dried soil layers in different climatic regions on the Loess Plateau of China
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Impacts of land use and plant characteristics on dried soil layers in different climatic regions on the Loess Plateau of China

机译：黄土高原不同气候区土地利用及植物特征对土壤干层的影响

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a- Spatial patterns of DSLs differ greatly among arid-, semiarid- and semihumid regions. a- The impact of land use on DSLs is different significantly among the three climatic regions. a- In each climatic region, the extent of DSLs depends on the plant species and growth ages. a- Only in the semiarid region, the DSL-SWC and SFC are significantly (P <0.001) influenced by soil type. A dried soil layer (DSL) formed in the soil profile is a typical indication of soil drought caused by climate change and/or poor land management. The responses of a soil to drought conditions in water-limited systems and the impacts of plant characteristics on these processes are seldom known due to the lack of comparative data on soil water content (SWC) in the soil profile. The occurrence of DSLs can interfere in the water cycle in soil-plant-atmosphere systems by preventing water interchanges between upper soil layers and groundwater. Consequently, a DSL may limit the sustainability of environmental restoration projects (e.g., revegetation, soil and water conservation, etc.) on the Loess Plateau of China and in other similar arid and semiarid regions. In this study, we investigated and compared the impacts of soil type, land use and plant characteristics within each of the three climatic regions (arid, semiarid, semihumid) of the Loess Plateau. A total of 17,906 soil samples from 382 soil profiles were collected to characterize DSLs across the Plateau. Spatial patterns of DSLs (represented by four indices: (1) DSL thickness, DSLT; (2) DSL forming depth, DSLFD; (3) mean SWC within the DSL, DSL-SWC; and (4) stable field water capacity, SFC) differed significantly among the climatic regions, emphasizing the importance of considering climatic conditions when assessing DSL variations. The impact of land use on DSLs varied among the three climatic regions. In the arid region, land use had no significant effect on DSLs but there were significant effects in the semiarid and semihumid regions (P <0.05). The development of DSLs under trees and grasses was more severe in the semiarid region than in the semihumid region. In each climatic region, the extent of DSLs depended on the plant species (e.g., native or exotic, tree or grass) and growth ages; while only in the semiarid region, the DSL-SWC and SFC (P <0.001) were significantly influenced by soil type. The DSL distribution pattern was related to the climatic region and the soil texture, which both followed gradients along the southeast-northwest axis of the Plateau. Optimizing land use can mediate DSL formation and development in the semiarid and semihumid regions of the Loess Plateau and in similar regions elsewhere. Understanding the dominant factors affecting DSLs at the regional scale enables scientifically based policies to be made that would alleviate the process of soil desiccation and sustain development of the economy and restoration of the natural environment. Moreover, these results can also be useful to the modeling of the regional water cycle and related eco-hydrological processes.
机译：在干旱，半干旱和半湿润地区，DSL的空间格局差异很大。 a-在三个气候区域之间，土地使用对DSL的影响差异很大。 a-在每个气候区域，DSL的范围取决于植物种类和生长年龄。 a-仅在半干旱地区，DSL-SWC和SFC受土壤类型的影响显着（P <0.001）。在土壤剖面中形成的干燥土壤层（DSL）是气候变化和/或土地管理不善造成的土壤干旱的典型指示。由于缺乏土壤剖面中土壤含水量（SWC）的比较数据，很少有人知道水受限系统中土壤对干旱条件的响应以及植物特性对这些过程的影响。 DSL的发生可通过阻止上部土壤层与地下水之间的水交换来干扰土壤－植物－大气系统中的水循环。因此，DSL可能会限制中国黄土高原以及其他类似干旱和半干旱地区的环境恢复项目（例如，植被恢复，水土保持等）的可持续性。在这项研究中，我们调查并比较了黄土高原三个气候区域（干旱，半干旱，半潮湿）中每个土壤类型，土地利用和植物特性的影响。从382个土壤剖面中收集了总共17,906个土壤样品，以表征整个高原地区的DSL。 DSL的空间模式（由四个指标表示：（1）DSL厚度DSLT;（2）DSL形成深度DSLFD;（3）DSL中的平均SWC DSL-SWC;以及（4）稳定田间水容量SFC ）在不同的气候区域之间存在显着差异，强调评估DSL变化时考虑气候条件的重要性。土地使用对DSL的影响在三个气候区域之间有所不同。在干旱地区，土地利用对DSL没有显着影响，但在半干旱和半湿润地区则有显着影响（P <0.05）。与半湿润地区相比，半干旱地区树木和草木下DSL的发展更为严重。在每个气候区域，DSL的范围取决于植物种类（例如本地或外来的，树木或草）和生长年龄;而仅在半干旱地区，土壤类型对DSL-SWC和SFC（P <0.001）有显着影响。 DSL的分布模式与气候区域和土壤质地有关，两者都沿着高原东南-西北轴的梯度变化。优化土地利用可以介导黄土高原半干旱和半潮湿地区以及其他类似地区的DSL形成和发展。了解在区域范围内影响DSL的主要因素，可以制定基于科学的政策，从而减轻土壤干燥过程并维持经济发展和自然环境的恢复。此外，这些结果也可用于区域水循环和相关生态水文过程的建模。

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