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梭梭和白梭梭主根周围土壤养分的梯度分布/Nutrient Gradient Distribution in Soil around Taproots of Haloxylon ammodendron and Haloxylon persicum[J]
Authors
中国科学院新疆生态与地理研究所阜康荒漠生态站,新疆乌鲁木齐,830011
中国科学院新疆生态与地理研究所阜康荒漠生态站,新疆乌鲁木齐830011/国家荒漠-绿洲生态建设工程技术中心,新疆乌鲁木齐830011
+4 more
李从娟
李彦
李惠
马健
Publication date
1 January 2011
Publisher
Abstract
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
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Last time updated on 29/11/2016