梭梭和白梭梭主根周围土壤养分的梯度分布

摘要/Abstract

摘要： 采用野外原位分层取样的方法,研究了古尔班通古特沙漠两个主要建群种——生长于丘间低地的梭梭(Haloxylon ammodendron)和生长于沙丘顶部流沙地上的白梭梭(Haloxylon persicum)——主根周围土壤的pH值、电导率及养分的梯度变化状况。结果显示,梭梭和白梭梭根际微区(0～1 cm)pH值均较土体(1～10 cm)低,电导率和各养分在根际微区均出现了聚集现象,最大聚集率在0～0.2 cm圈层,梭梭、白梭梭的最大根际效应R/S分别为电导率1.17、1.23,有机质2.00、2.41,全N 2.64、2.86,有效N 2.42、3.26,有效P 2.14、1.71,全P 1.14、1.12(在两种植物根围土壤变化不是很大,但也存在正的根际效应),这说明梭梭和白梭梭根际微区均有显著的养分聚集的现象。结果还显示,梭梭根围土壤各因子均较白梭梭高,这可能是梭梭和白梭梭生活在不同生境所致。R/S分析表明,除有效磷外,白梭梭根际的“肥岛”效应均较梭梭明显,这说明了越是在养分胁迫的土壤环境,荒漠灌木的“肥岛”效应越显著。

关键词: 梭梭, 白梭梭, 根际, 肥岛

Abstract: Soil samples around the taproots of Haloxylon ammodendron in the inter-dune area and H. persicum in the top shifting-dune were taken in the Gurbantunggute Desert and were brought to laboratory to measure pH, electrical conductivity and nutrients contents. Results show that soil pH at 0—1 cm off the roots is lower than that at 1—10 cm off the roots, and the larger values of soil electrical conductivity and soil nutrients contents are also at 0—1 cm off the roots, especially at 0—0.2 cm off the roots. The largest rhizosphere effects (R/S) of H. ammodendron and H. persicum are respectively: 1.17 and 1.23 for soil electrical conductivity, 2.00 and 2.41 for soil organic matter, 2.64 and 2.86 for total N, 2.42 and 3.26 for available N, 2.14 and 1.71 for available P, 1.14 and 1.12 for total P. It indicates that nutrients accumulate in rhizosphere, but the accumulation of total P is not so obvious. Apart from available P, the rhizosphere fertile-island effects of H. persicum are obvious than that of H. ammodendron, demonstrating a phenomenon of "more obvious fertile island effects exist in the more soil nutrient stress environment".

Key words: H. ammodendron Bge, H. persicum Bge, rhizosphere, fertile island

中图分类号:

Q948.113

李从娟;马健*;李彦;李惠;. 梭梭和白梭梭主根周围土壤养分的梯度分布[J]. 中国沙漠, 2011, 31(5): 1174-1180.

LI Cong-juan;MA Jian;LI Yan;LI Hui;. Nutrient Gradient Distribution in Soil around Taproots of Haloxylon ammodendron and Haloxylon persicum[J]. JOURNAL OF DESERT RESEARCH, 2011, 31(5): 1174-1180.

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