关帝山不同植被恢复类型对土壤碳、氮含量及微生物数量的影响

被引：28

作者：

赵溪

李君剑

李洪建

机构：

[1] 山西大学黄土高原研究所

来源：

生态学杂志 | 2010年 / 29卷 / 11期

关键词：

植被类型; 总氮; 无机氮; 微生物数量; 季节变化;

D O I：

10.13292/j.1000-4890.2010.0341

中图分类号：

S154 [土壤生物学];

学科分类号：

071012 ; 0713 ;

摘要：

测定了不同植被恢复类型[包括撂荒地、沙棘灌木林、华北落叶松人工林和混交林(主要由华北落叶松、白桦和山杨组成)]土壤有机碳、总氮、硝态氮、铵态氮及与氮代谢有关的土壤微生物数量(细菌、放线菌、真菌、固氮菌、硝化细菌和反硝化细菌)的季节动态。结果表明,不同植被类型土壤无机氮和微生物数量存在显著的季节波动,土壤有机碳、总氮、硝态氮、铵态氮和不同种类的微生物数量随土壤深度的加深而显著降低。沙棘灌木林、华北落叶松人工林和混交林3种植被类型的土壤有机碳氮、无机氮以及微生物数量均较撂荒地高,其中自然恢复的混交林提高幅度最大,土壤碳、氮和微生物数量分别提高了0.21%～2.05%和0.09%～19.25%,真菌最大提高幅度可达19.25%,无机氮含量增幅较小,为0.01%～0.49%。土壤有机碳、总氮、无机氮与微生物数量间呈显著线性正相关。总之,不同植被恢复后土壤肥力均会显著提高,但以次生混交林对土壤肥力提高效果最明显。

引用

页码：2102 / 2110

页数：9

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