Wirkung des Mikroreliefs auf die räumliche Variabilität des Kohlenstoffgehaltes eines Podzoluvisols in einem Dauerdüngungsversuch

Abstract

EinfuhrungDie GesetzmaBigkeiten der raumlichen Verteilung der Bodeneigenschaften sind von verschiedenen Faktoren abhangig, und zwar vom bodenbildenden Substrat, vom Relief und vom ZuschuBwasser (Fridland, 1972;Haase, 1973). Die wichtigsten Variabilitatsfaktoren sind fur verschiedene Standorte spezifisch und unterschiedlich. In der Zone der Verbreitung der Podzoluvisols bei einheitlichen lithologischen Entstehungsbedingungen ist das Relief der wichtigste Faktor der Differenzierung der Bodendecke und -eigenschaften (Melluma, 1968). Durch das Relief sind die wichtigsten Differenzierungsprozesse bedingt: Erosion, Akkumulation, Vergleyung, Podsolierung. Eine Analyse der Literaturdaten 1aBt auf eine wesentliche und langfristige Wirkung des Reliefs auf die Dynamik der Bodeneigenschaften sogar auf kleinen Flachen (1-2 ha) schlieaen, z. B. in Dauerfeldversuchen, trotz verschiedener AusgleichsmaBnahmen. Effect of microrelief on the spatial variability of carbon content of a Podzoluvisol in a long term field trialThe relationship between microrelief and spatial distribution and variability of the soil C,-content was investigated in a long term field experiment with different fertilizer and herbicide treatments near Moscow. Only 2 0 1 of the C,-variability were related to agricultural factors. In order to analyse the influence of the microrelief on soil C,-content the relief was formalized. This formalization included the calculation of the local inclination, local water gathering area and local relative intensity of the temporary water streams, while distinguishing between convex and concave relief forms. Relief forms of different order were identified by kriging with different distances between the block centers. The parameters of the formalized relief were compared with the C,-content of the soil by means of sernivariograms and correlations. Through combination of relief parameters, it was possible to divide the field into different elements characterized by different correlations and effect types. The water gathering relief forms with maximal values of the relative intensity of the water streams and the arched forms with increasing intensity reduced soil C,-content. C,-accumulation occurred at transit positions between the convex and concave relief forms with medium intensity.

Diversity of humus stocks in the arable soils of the Late Pleistocene ground morains in Mecklenburg, West Pomerania, Germany

“…Mention should also be made of the research carried out in other countries: Kuzyakova et al (1997) showed the effects of the micro-relief of a moraine hill slope on the variability of carbon content in the topsoil (0 -25 cm) in a long-term field investigation near Moscow. Kravchenko et al (1999) analysed soil spatial variabilities.…”

Spatial soil sampling design using apparent soil electrical conductivity measurements

“…In this case, the presence of trend is related to the area topography with a 2% slope (Figure 1), which contributes to water flow in downhill direction and causes the greatest values of water content in the lowest area in the field. According to Kuzyakova et al (1997), soil topography is one of the main factors that affect the soil spatial variability; they described that landscape shape (concave, convex or lineal) has different spatial variability caused mainly by the different water flow in the soil.…”