Small-Scale Spatial Variability of Soil Nutrients and Vegetation Properties in Semi-Arid Northern China

CHEN Fu-Sheng; ZENG De-Hui; HE Xing-Yuan

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Small-Scale Spatial Variability of Soil Nutrients and Vegetation Properties in Semi-Arid Northern China

机译：中国半干旱区土壤养分的小尺度空间变异与植被特征。

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A field experiment was conducted at Kezuohouqi County, Inner Mongolia Autonomous Region of China, which was located on the southeastern edge of the Horqin Sandy Land, to study the spatial variability of soil nutrients for a smallscale, nutrient-poor, sandy site in a semi-arid region of northern China; to investigate whether or not there were "islands of fertility" at the experimental site; and to determine the key nutrient elements that sustained ecosystem stability. Results obtained from geostatistical analysis indicated that the spatial distribution pattern of soil total nitrogen (STN) was far different from those of soil organic matter (SOM), total phosphorus (STP), and total potassium (STK). Compared to SOM, STP, and STK, STN had a lower structural heterogeneity ratio and a longer range, while other elements were all similar. In addition, STN had an isotropic spatial structure, whereas the others had an anisotropic spatial structure.The spatial structure patterns of herbage species, cover, and height also differed, indicating that spatial variability was subjected to different ecological factors. Differences in the spatial variability patterns among soil nutrients and vegetation properties showed that soil nutrients for a small-scale were not the primary limiting factors that influenced herbage spatial distribution patterns. Incorporating spatial distribution patterns of tree species, namely, Pinus sylvestris var. mongolica Litv. and shrub Lespedeza bicolor Turcz. in a research plot and using fractal dimension, SOM, STP, and STK were shown to contribute to the "islands of fertility" phenomenon, however STN was not, possibly meaning that nitrogen was a key limiting element. Therefore, during restoration of similar ecosystems more attention should be given to soil nitrogen.

机译：在位于科尔沁沙地东南边缘的内蒙古自治区克左侯旗县进行了田间试验，以研究半干旱地区小规模，营养贫瘠的沙质土壤土壤养分的空间变异性。中国北方干旱地区;调查实验地点是否有“生育之岛”;并确定维持生态系统稳定的关键营养元素。地统计分析结果表明，土壤总氮（STN）的空间分布模式与土壤有机质（SOM），总磷（STP）和总钾（STK）的空间分布方式有很大差异。与SOM，STP和STK相比，STN具有较低的结构异质比和较大的范围，而其他元素都相似。此外，STN具有各向同性的空间结构，而其他则具有各向异性的空间结构。牧草种类，覆盖率和高度的空间结构模式也不同，表明空间变异性受不同的生态因素影响。土壤养分和植被性质之间空间变异性模式的差异表明，小范围的土壤养分并不是影响草本植物空间分布格局的主要限制因素。纳入树木物种空间分布格局，即樟子松。蒙古自治州和灌木Lespedeza双色Turcz。在研究图中并使用分形维数，SOM，STP和STK被证明有助于“生育岛”现象，但是STN却没有，可能意味着氮是关键的限制元素。因此，在恢复类似生态系统的过程中，应更加注意土壤氮素。

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来源
《土壤圈（英文版）》 |2006年第6期|778-787|共10页
作者
CHEN Fu-Sheng; ZENG De-Hui; HE Xing-Yuan;
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作者单位

Daqinggou Ecological Station, Institute of Applied Ecology, Chinese Academy of Sciences, Shengyang 110016(China);

Life College, Nanchang University, Nanchang 330047(China);

Daqinggou Ecological Station, Institute of Applied Ecology, Chinese Academy of Sciences, Shengyang 110016(China);

Daqinggou Ecological Station, Institute of Applied Ecology, Chinese Academy of Sciences, Shengyang 110016(China);

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收录信息中国科学引文数据库(CSCD);
原文格式 PDF
正文语种 chi
中图分类农业基础科学;
关键词
Pinus sylvestris var. mongolica Litv.; semi-arid region; soil nutrients; spatial variability; species richness;

机译：樟子松蒙古;半干旱地区;土壤养分;空间变异性;物种丰富度;

Small-Scale Spatial Variability of Soil Nutrients and Vegetation Properties in Semi-Arid Northern China

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