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首页> 外文期刊>Plant and Soil >Effects of repeated (NH_4)_2SO_4 application on sulfur pools in soil, soil microbial biomass, and ground vegetation of two watersheds in the Black Forest/Germany
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Effects of repeated (NH_4)_2SO_4 application on sulfur pools in soil, soil microbial biomass, and ground vegetation of two watersheds in the Black Forest/Germany

机译：重复施用（NH_4）_2SO_4对黑森林/德国两个流域土壤中硫库，土壤微生物量和地面植被的影响

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摘要

The effect of repeated (NH_4)_2SO_4 applications (3 X 700 kg ha~(-1) in 1988, 1991, and 1994, respectively) on S pools in soil, soil microbial biomass, and ground vegetation was studied at two Norway spruce (Picea abies L. [Karst.]) sites in the Black Forest/Germany. In both eco-systerns, most of the total S pool was located in the soil. The soil also was the predominant compartment for retention of applied SO_4~(2-)-S. The fractions of organic and inorganic S forms in the initial soil S content, and the retention of experimentally applied S was different for both sites. In the podzol Schluchsee, organic S accounted for 92 percent of total S. In the cambisol Villingen, the S pool consisted of 33 percent organic S and 67 percent inorganic S. The retention of applied S in various compartments of both ecosystems reflected these proportions. Only minor amounts of fertilized S (< 1 percent) was retained in the spruce trees, ground vegetation, and soil microbial biomass. However, between 51 percent (Villingen) and 72 percent (Schluchsee) of the applied S was retained in the soil. In the Schluchsee podzol, 75 percent of retained fertilizer S was accumulated as ester sulfate, whereas SO_4~(2-) adsorption and precipitation of Al hydroxy sulfates were restricted by dissolved organic matter in the soil solution. In the Villingen cambisol, SO_4~(2-) adsorption was the dominant process of S retention, although 20 percent of the fertilized S again was retained as ester sulfate. The significant relevance of organic S forms in the retention of fertilizer S in both soils emphasizes the need for models which include the formation and remineralization of organic S compounds, especially of ester sulfates, for correctly simulating and predicting the retention andremobilization of S in acid forest soils subject to changing atmospheric N and S deposition.
机译：在挪威的两个云杉上研究了重复施用（NH_4）_2SO_4（分别在1988、1991和1994年为3 X 700 kg ha〜（-1））对土壤，土壤微生物量和地面植被中S池的影响（ Picea abies L. [Karst。]网站位于德国黑森林。在两个生态系统中，总的S池大部分位于土壤中。土壤也是保留施用的SO_4〜（2-）-S的主要区域。有机和无机S的分数在初始土壤S含量中形成，并且在两个位置上实验施用的S的保留量均不同。在Podzol Schluchsee中，有机S占总S的92％。在坎比索尔Villingen中，S池由33％的有机S和67％的无机S组成。两个生态系统各个隔室中施用的S的保留量均反映了这些比例。云杉树木，地面植被和土壤微生物生物量中仅保留了少量的施肥硫（<1％）。但是，施用的硫中有51％（维林根）和72％（Schluchsee）保留在土壤中。在Schluchsee podzol中，残留的肥料S以硫酸酯的形式积累了75％，而SO_4〜（2-）对羟基硫酸铝的吸附和沉淀则受到土壤溶液中溶解有机物的限制。在Villingen cambisol中，SO_4〜（2-）吸附是硫保留的主要过程，尽管再次有20％的受精S以硫酸酯的形式保留。有机S形态与土壤中肥料S的保留有着显着的相关性，因此需要建立包括有机S化合物（尤其是硫酸酯）的形成和再矿化模型，以正确模拟和预测酸性森林中S的保留和迁移。易变化的大气N和S沉积物的土壤。

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