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黄土高原水蚀风蚀交错带 六道沟小流域坡面表土钙质结核分布
巩铁雄1,2; 朱元骏1,2,3
Source Publication中国水土保持科学

量化坡面钙质结核分布,有助于深化对黄土高原水蚀风蚀交错带特定土壤类型( 含钙质结核土壤) 中水土过
程的认识。本研究通过对坡面不同部位的表层土壤( 0 ~ 20 cm) 颗粒组成、钙质结核质量分数和植被地上生物量、
盖度、丰富度及多样性指数的测定和分析,研究了坡面钙质结核的分布及影响因素。结果表明: 土壤黏粒体积分数
沿坡面呈逐渐降低趋势; 钙质结核质量分数沿坡面呈单峰曲线分布,在坡面1 /4 ~ 1 /3 的位置( 距离坡顶20 ~ 30 m)
处,达到峰值( 10% ~ 15%) 。钙质结核质量分数与坡度呈线性正相关,与植被地上生物量( 盖度) 呈单峰曲线关系,
峰值即为植被影响钙质结核质量分数的临界点,临界点处的植被盖度在11% ~ 16%之间。影响坡面钙质结核分布
的最主要因素为坡度和植被; 小尺寸的钙质结核在坡面分布范围最广、数量最多,起决定作用的钙质结核尺寸在
5 ~ 15 mm 之间。坡面钙质结核质量分数及分布反映了径流、植被和钙质结核之间的相互作用关系,钙质结核质量

Other Abstract

[Background]Loess soil is rich of calcium carbonate. With climate alternations of wetting
and drying in soil genesis process,the calcium carbonate happens leaching and deposition and forms
caliche in soil layer. This caliche rises to ground surface due to intensive soil erosion and human activity
in the wind-water erosion crisscross region of the Loess Plateau and then it breaks down to pieces by
outside forces to form caliche nodules. Quantifying the distribution pattern of caliche nodule on hillslopes
can improve the understanding of soil-water process in special soil type ( soil containing caliche nodules)
in this region. [Methods] This study aimed to investigate the spatial pattern of caliche nodule on
hillslopes,its influencing factors and their interactions through taking soil and plant samples andanalyzing surface soil ( 0 - 20 cm) particle compositions,caliche nodule mass fraction,vegetation aboveground
biomasses,coverage,abundances and diversity indexes in the different positions of the hillslopes.
The soil samples were firstly through 2 mm sieve to separate caliche nodules from fine soil. The caliche
nodules were then cleaned,dried,and weighed. Finally they were classified by sieves of 5,10,15,20
and 25 mm,respectively. Soil particle composition was measured by MS2000 laser granulometer.
[Results]The results indicated that soil clay particle decreased gradually along the hillslopes. Caliche
nodule content had a distribution pattern of single peak along the hillslopes and it achieved peak value
( 10% - 15%) at the position of 1 /4 - 1 /3 hillslopes ( about 20 - 30 m distance from the top of the
hillslopes) . Caliche nodule content was positively correlated with slope gradient. It had single peak curve
relationship with vegetation above-ground biomass. This peak value was the threshold point of vegetation
affecting caliche nodule content and the vegetation coverage at the threshold point was among 11% -
16%. Slope gradient and vegetation were two most important factors to control caliche nodule distribution
on the hillslopes. Small size caliche nodules spread more widely on the hillslopes and meanwhile their
numbers were the most. The dominant size of caliche nodule was 5 - 15 mm. [Conclusions] Caliche
nodule content and pattern on the hillslopes reflected the interactions between runoff,vegetation and
caliche nodule. Runoff tended to take caliche nodules from higher position to lower position and its
carrying force was positively related to slope gradient. Vegetation can reduce the carrying force of runoff
and at the same time can intercept caliche nodule. All of these led to caliche nodule content positively
related to slope gradient,and on the other hand it showed a single peak pattern along the slopes. Caliche
nodule content could be used as a slope erosion indicator.

Keyword黄土高原水蚀风蚀交错带 钙质结核 土壤侵蚀 坡度 植被
Indexed By中文核心期刊要目总览
Document Type期刊论文
First Author Affilication中国科学院水利部水土保持研究所
Recommended Citation
GB/T 7714
巩铁雄,朱元骏. 黄土高原水蚀风蚀交错带 六道沟小流域坡面表土钙质结核分布[J]. 中国水土保持科学,2016,14(4):42-49.
APA 巩铁雄,&朱元骏.(2016).黄土高原水蚀风蚀交错带 六道沟小流域坡面表土钙质结核分布.中国水土保持科学,14(4),42-49.
MLA 巩铁雄,et al."黄土高原水蚀风蚀交错带 六道沟小流域坡面表土钙质结核分布".中国水土保持科学 14.4(2016):42-49.
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