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作 者 ：

刘兴宇^1,2;赵琼¹;曾德慧¹;刘金环¹;胡亚林^1,2;邓东周^1,2;王红^1,2

期 刊 ：应用生态学报 2008年 19卷 03期 页码：494-498

关键词：樟子松；

摘 要 ：

为弄清科尔沁沙地东南部樟子松人工林是否受土壤磷素供应的限制，找出反映土壤磷素供应状况的最佳叶片养分指标，分析了樟子松人工林不同年龄针叶中全磷、无机磷、有机磷和全氮浓度以及土壤有效磷浓度.结果表明：研究区樟子松人工林土壤有效磷浓度较低，为0.12～0.63 mg·kg^-1；土壤有效磷浓度与当年生针叶无机磷和全磷浓度显著相关，而与针叶全磷的相关性来源于针叶中无机磷与全磷的相关.与当年生针叶全磷浓度相比，针叶无机磷浓度能更为准确、直接地反映土壤的供磷水平.

Abstract:

To make clear whether Mongolian pine (Pinus sylvestris var.mongolica) plantation is limited by soil phosphorus (P) supply in southeast Horqin sand land and to find out the best leaf indicator of soil P supply, the concentrations of total P, inorganic P and organic P in the needles of different age ofP. sylvestris var. mongolica and the soil available P were analyzed. The results showed that in the study area, soil available P was rather low (0.12-0.63 mg·kg^-1), and had significant correlations with the inorganic P (cPi) and total P (cPt) concentrations in the current-year needles of P. sylvestris var. mongolica. The significant correlation between soil available P and needle cPt derived from the significant correlation between cPi and cPt. Compared with cPt, cPi could reflect the level of soil P supply more accurately and directly.

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