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首页> 外文学位 >Biochemistry at the grassland-shrubland boundary: A case study of desertification in the northern Chihuahuan Desert of New Mexico.
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Biochemistry at the grassland-shrubland boundary: A case study of desertification in the northern Chihuahuan Desert of New Mexico.

机译：草地灌木丛边界的生物化学：以新墨西哥州奇瓦瓦沙漠北部的荒漠化为例。

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The role of vegetation in regulating the spatial distribution of soil nutrients, with particular attention to soil phosphorus, was examined in a semiarid ecosystem in south-central New Mexico. In the grassland, where vegetation forms a relatively uniform cover over the landscape, soil nutrients followed a homogeneous spatial pattern. In the shrubland, where vegetation forms a relatively patchy cover over the landscape, soil nutrients followed a heterogeneous spatial distribution. In particular, N, P, and K, showed greatest concentrations under the shrub canopy; whereas, Na, showed greatest concentrations in the intershrub space. These results demonstrate the importance of biological processes to ecosystem structure and function in semiarid regions.; The distribution of phosphorus in Chihuahuan desert soils varies depending on the specific fraction of soil phosphorus. Using a sequential laboratory method for phosphorus fractionation, the total phosphorus pool may be separated into labile, non-occluded and occluded fractions of phosphorus. In the grassland, all fractions of soil phosphorus follow a uniform distribution reflecting the uniformity of plant cover. In the shrubland, the distribution of labile, non-occluded, and occluded phosphorus reflects the heterogeneity of plant cover. A small, but essential, pool of organic phosphorus and the labile phosphorus fractions are concentrated under the shrub canopy, but those fractions under geochemical control are equally concentrated under and between shrubs.; A literature survey of soil phosphorus data from studies that exclusively followed the sequential phosphorus fractionation method of Hedley et al. (1982) shows that the organic phosphorus content in the labile fractions may provide an index of biological and geochemical influences on soil phosphorus cycling in different soils.
机译：在新墨西哥州中南部的半干旱生态系统中，研究了植被在调节土壤养分的空间分布中的作用，特别是对土壤磷的关注。在草原上植被覆盖相对均匀的草原上，土壤养分遵循均匀的空间格局。在灌木丛中，植被在地形上形成相对零散的覆盖，土壤养分遵循不同的空间分布。特别是在灌木冠层下，N，P和K浓度最高。而Na在灌木间空间中表现出最大浓度。这些结果证明了生物过程对半干旱地区生态系统结构和功能的重要性。奇瓦瓦沙漠土壤中磷的分布随土壤磷的特定含量而变化。使用顺序的实验室方法进行磷分级分离，可将总磷库分离为不稳定的，未阻塞的和阻塞的磷部分。在草原上，土壤磷的所有部分都遵循均匀分布，反映出植物覆盖的均匀性。在灌木丛中，不稳定，未封闭和封闭的磷的分布反映了植物覆盖的异质性。一小部分但必不可少的有机磷和不稳定的磷级分集中在灌木冠层下，但在地球化学控制下的那些部分同样集中在灌木下和灌木间。一项仅遵循Hedley等人的顺序磷分级分离方法的研究对土壤磷数据进行的文献调查。 （1982年）表明，不稳定部分中的有机磷含量可能为不同土壤中磷循环的生物学和地球化学影响提供指标。

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