Immobilization of soil nitrogen as a possible method for the restoration of sandy grassland

被引:65
作者
Toeroek, K. [1 ]
Szili-Kovacs, T. [2 ]
Halassy, M. [3 ]
Toth, T. [2 ]
Hayek, Zs [1 ]
Paschke, M. W. [4 ]
Wardell, L. J. [5 ]
机构
[1] MTA OBKI, Inst Ecol & Bot, H-2163 Vacratot, Hungary
[2] Res Inst Soil Sci & Agr Chem, Budapest, Hungary
[3] Eotvos Lorand Univ, Dept Plant Taxon & Ecol, Budapest, Hungary
[4] Colorado State Univ, Dept Rangeland Ecosyst Sci, Ft Collins, CO 80523 USA
[5] New Mexico Tech Univ, Dept Earth & Environm Sci, Socorro, NM 87801 USA
关键词
Carbon source; Festucetum vaginatae; Hungary; Nitrogen availability; Secondary succession; Horvath et al; (1995);
D O I
10.2307/1478913
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
. Experiments were designed to test the applicability of nitrogen immobilization as a means of accelerating the recovery of an endemic open sandy grassland (Festucetum vaginatae danubiale) on old fields in the Great Hungarian Plain. Effects of various carbon sources (sucrose, starch, cellulose and sawdust) and their combinations in different quantities were studied in laboratory microcosms. Carbon addition decreased nitrogen availability in all cases, the intensity and timing of change being dependent on the type of carbon source applied. The combination of 2 g each of sucrose and polysaccharides (starch, cellulose, sawdust) per kg soil was found to be the most effective, as sucrose decreased available nitrogen content of soil intensively and the polysaccharides maintained the immobilized nitrogen for a longer period. In a follow-up experiment, sucrose and sawdust were selected for field application to test their effectiveness in immobilizing N and accelerating restoration. The field experiment was established to test the importance of abiotic site differences in the immobilization of soil nitrogen. Selected sites were located along an elevation, moisture and productivity gradient. Soil organic matter, microbial biomass-C and decomposition rate varied between sites depending on the elevation gradient. At two sites with lower soil moisture and organic matter levels carbon addition increased microbial activity and nitrogen immobilization significantly.
引用
收藏
页码:7 / 14
页数:8
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