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应用生态学报 ›› 2012, Vol. 23 ›› Issue (03): 595-602.

• 研究论文 • 上一篇    下一篇

黄土高原小叶杨与其他树种枯落叶混合分解对土壤性质的影响

李〓茜1,刘增文2,3**,杜良贞1   

  1. 1西北农林科技大学林学院, 陕西杨凌 712100; 2西北农林科技大学资源环境学院, 陕西杨凌 712100; 3农业部黄土高原农业资源与环境修复重点开放实验室, 陕西杨凌 712100
  • 出版日期:2012-03-18 发布日期:2012-03-18

Effects of mixed decomposition of Populus simonii and other tree species leaf litters on soil properties in Loess Plateau.

LI Qian1, LIU Zeng-wen2,3, DU Liang-zhen1   

  1. 1College of Forestry, Northwest A & F University, Yangling 712100, Shaanxi, China; 2College of Resources and Environment, Northwest A & F University, Yangling 712100, Shaanxi, China; 3Ministry of Agriculture Key Laboratory for Agricultural Resources and Environmental Remediation in Loess Plateau, Yangling 712100, Shaanxi, China
  • Online:2012-03-18 Published:2012-03-18

摘要: 将小叶杨分别与其他11个树种枯落叶粉碎混合后进行室内分解培养,分析不同树种枯落叶混合分解对土壤性质的影响及其相互作用.结果表明: 12个树种枯落叶单独混土分解均明显提高了土壤脲酶、脱氢酶、磷酸酶活性和有机质、碱解N含量,但对土壤速效P含量和土壤阳离子交换量(CEC)的影响差异较大,其中柠条和紫穗槐枯落叶改善土壤性质的效果明显.小叶杨分别与油松、侧柏、刺槐、白榆枯落叶混合分解,对土壤微生物数量的影响存在相互促进作用;小叶杨分别与侧柏、柠条枯落叶混合分解对土壤有机质、速效P、速效K含量和CEC的影响存在相互促进作用,但对土壤大部分酶活性的影响却存在相互抑制作用;小叶杨与落叶松枯落叶混合分解对土壤多数酶活性和养分含量的影响存在相互促进作用,而与樟子松枯落叶混合分解时则有抑制作用.总体上,小叶杨分别与白榆、油松、落叶松和刺槐枯落叶混合分解可促进土壤性质的改善,而与侧柏、柠条、樟子松、沙棘和紫穗槐枯落叶混合分解时则相互抑制.

关键词: 小叶杨, 枯落叶, 混合分解, 森林土壤

Abstract: In this study, the leaf litters of Populus simonii and other 11 tree species were put into soil separately or in mixture after grinding, and incubated in laboratory to analyze the effects of their decomposition on soil properties and the interactions between the litters decomposition. The decomposition of each kind of the leaf litters in soil increased the soil urease, dehydrogenase, and phosphatase activities and the soil organic matter and available N contents markedly, but had greater differences in the effects on the soil available P content and CEC. The decomposition of the leaf litters of Caragana microphylla and of Amorpha fruticosa showed obvious effects in improving soil properties. The decomposition of the mixed leaf litters of P. simonii and Pinus tabulaeformis, Platycladus orientalis, Robinia pseudoacacia, or Ulmus pumila showed interactive promotion effects on the abundance of soil microbes, and that of the mixed leaf litters of P. simonii and P. orientalis or C. microphylla showed interactive promotion effects on the soil organic matter, available P, and available K contents and soil CEC but interactive inhibition effects on the activities of most of the soil enzymes tested. The decomposition of the mixed leaf litters of P. simonii and Larix principis-rupprechtii showed interactive promotion effects on the activities of most of the soil enzymes and soil nutrient contents, while that of the mixed leaf litters of P. simonii and P. sylvestris var. mongolica showed interactive inhibition effects. Overall, the decomposition of the mixed leaf litters of P. simonii and U. pumila, P. tabulaeformis, L. principis-rupprechtii, or R. pseudoacacia could improve soil quality, but the mixed leaf litters of P. simonii and P. orientalis, C. microphylla, P. sylvestris var. mongolica, Hippophae rhamnoides, or A. fruticosa showed an interactive inhibition effect during their decomposition.

Key words: Populus simonii, leaf litter, mixed decomposition, forest soil