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作 者 ：戴开结,何方,沈有信*,周文君,邓云,张建华

期 刊 ：生态学报 2009年 29卷 8期 页码：4078~4083

关键词：磷；云南松；幼苗；生长；环境；

Keywords:phosphorus, Pinus yunnanensis Franch., seedling, growth, environment,

摘 要 ：磷是控制生命过程的重要元素，植物在生长过程中需要大量的磷，低磷常导致一些植物发生适应性变化。云南松(Pinus yunnanensis Franch.)对低磷土壤环境表现出了很强的适应能力，广泛分布并正常生长于贫瘠的低磷红壤上，研究不同磷源对云南松幼苗生长和磷吸收量影响，对揭示云南松的低磷适应机理具有重要参考意义。试验所用培养云南松幼苗的种子采集自云南省通海县秀山森林公园内的健壮云南松林。试验研究了不同磷源对云南松幼苗茎高、主根长、生物量、根冠比、磷含量的影响，结果表明：（1）不同磷源处理间云南松幼苗茎高（F=2.352，P=0.067）、主根长（F=1.775，P=0.151）、茎叶生物量（F=1359，P=0.269）、根系生物量（F=2.807，P=0.035）和总生物量（F=1.017，P=0.427）几个参数并没有表现出实质性差异，云南松幼苗生长在不同磷源处理间的差异不明显；（2）不同磷源处理下云南松幼苗根冠比的大小顺序依次为普通磷源KH2PO4>钙磷Ca3(PO4)2>铝磷AlPO4>无磷CK>铁磷FePO4·4H2O，幼苗体内磷含量的高低顺序依次为普通磷源KH2PO4>铁磷FePO4·4H2O>铝磷AlPO4>钙磷Ca3(PO4)2>无磷CK；（3）普通磷源比其它磷源更能够被云南松幼苗吸收利用；（4）云南松幼苗地下部分磷含量始终比地上部分磷含量高。

Abstract:Phosphorus is an important element that controls the process of plant life, especially during its growth phase. Low\|phosphorus in the soil usually leads to adaptive changes in plants. Yunnan Plateau, being its distribution range, Pinus yunnanensis Franch. reflects great capability of adapting to low\|phosphorus red soil. Therefore, to study the effect of different phosphorus on Pinus yunnanensis Franch. seedlings becomes an important reason to help unveil mechanism of adaptation towards low\|phosphorus. Present study was to analyze growth and internal P content of seedlings (Pinus yunnanensis Franch.) to various phosphorus supplies. The seeds used to culture seedlings were collected from healthy and mature forest of Pinus yunnanensis Franch in Xiushang Forest Park, Tonghai county, Yunnan province, China. The results of test were as follows: (1) The growth of Pinus yunnanensis Franch. seedlings including shoot height（F=2.352，P=0067）, taproot length（F=1.775，P=0.151）, shoot biomass（F=1.359，P=0.269）, root biomass（F=2.807，P=0035） and total biomass（F=1.017，P=0.427） did not present substantial differences between different phosphorus supplies; (2) The range of seedling root/shoot ratio was KH2PO4>Ca3(PO4)2>AlPO4>CK>FePO4.4H2O and that of internal P content was KH2PO4>FePO4.4H2O>AlPO4>Ca3(PO4)2>CK; (3) KH2PO4 was better used by Pinus yunnanensis Franch. seedlings; (4) The internal P content of root was always higher than that of shoot.

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