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• W2051257327 abstract "In order to have a basic knowledge of revegetation, one needs to deepen his understanding of the interactive effects of vegetation and soil. In this article, aboveground biomass, soil nutrients and moisture of 36 old-fields with different abandonment ages (from 2 to 45 years after abandonment), aboveground biomass of 4 typical old-fields, and growth characteristics of 7 predominant old-field species were measured. Changing pace, trend and relationship of community aboveground biomass and soil nutrition during the secondary succession were evaluated; effects of soil nutrition on community aboveground biomass were analyzed using multivariable analysis and pathway analysis, and effects of aboveground biomass on soil nutrition were further discussed. The results show that: (1) Soil nutrients, including organic matter, total nitrogen, total phosphorus, total potassium, nitrate nitrogen, ammonium nitrogen, active phosphorus and active potassium, have the same changing pace and trends as the aboveground biomass. In the process of secondary succession, both the soil nutrition and the community aboveground biomass decreased in the earlier abandonment stage of succession and then increased subsequently. (2) On the basis of the correlation of soil nutrients and abandonment ages, effects of vegetation on 0–20 cm organic matter, active phosphorus, 0–20 cm and 20–40 cm nitrate nitrogen nutrition are significant, while on the basis of the correlation of soil nutrition and aboveground biomass, no significant effects were observed. Hereinbefore, aboveground biomass accounts for only a part of vegetation-soil nutrition effects. The effects of biomass on organic matter, total nitrogen, total phosphorous, total potassium, nitrate nitrogen, active potassium and phosphorous are positive, whereas for ammonium nitrogen it is negative. (3) Abandonment ages, total nitrogen, total potassium, active potassium and soil moisture fluctuation have direct positive effects on the aboveground biomass of old-field communities; abandonment and soil moisture fluctuation have lager effects. Each ingredient of soil nutrition has relatively small effect, among which total nitrogen has larger effects than total and active potassium. The changes in aboveground biomass of old-field communities during succession are caused mainly by the changes in coverage and ecological characteristics of community species (the relatively larger direct effects of abandonment ages), and secondly by the soil moisture fluctuation (the relative smaller indirect effect of abandonment ages through soil moisture). (4) As a dependent variable, belowground biomass approaches power function of soil depth and declines in deeper layer. The root/shoot ratio of communities tends to increase in later succession stages, which also has an increasing tendency. These may influence the accumulation of biomass and decomposition of organic matter, and the vegetation-soil effects may be different." @default.
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• W2051257327 date "2007-05-01" @default.
• W2051257327 modified "2023-10-01" @default.
• W2051257327 title "Community biomass of abandoned farmland and its effects on soil nutrition in the Loess hilly region of Northern Shaanxi, China" @default.
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• W2051257327 doi "https://doi.org/10.1016/s1872-2032(07)60038-9" @default.
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