模拟降雨条件下施磷量对褐土无机磷含量及形态转化的影响

doi:10.7668/hbnxb.2009.03.041

摘要/Abstract

摘要： 采用室内土柱模拟试验,研究在山东平均降雨条件下不同施磷量对褐土各组分无机磷含量及形态转化的影响.结果表明,经过模拟降雨后,在0～10 cm土层中,各施磷处理的无机磷总量随着施磷量的增加而升高;随着土层的加深(10～50 cm),各土层无机磷总量是施磷量为P₂(180 kg/hm²)时最高.而在10-30 cm土层,是施磷量为P₃(1440 ks/hm²)的土壤无机磷总量高于P₁,而在30～50 cm则是P₁高于P₃.同时,不同施磷量对磷组分含量及其占无机磷总量的比例都发生了改变,当施磷量分别为P₁、P₂和P₃时,各无机磷组分的含量及所占比例按高低排序分别为:Ca₁₀-P>Al-P,O-P>Ca₈-P>Fe-P>Ca₂-P;O-P>Ca₈-P,Ca₁₀-P>Fe-P,AI-P>Ca₂-P和Ca₁₀-P,O-P>Fe-P,Ca₈-P>Al-P>Ca₂-P.随着土层深度的加深,O-P、Fe-P和Ca₁₀-P的含量保持相对稳定,而有效态无机磷源(Ca₂-P、Ca₈-P和AI-P)有降低的趋势;在小雨强度下,不同施磷量处理的土壤磷淋失量差异不显著,而随着降雨强度的加大,P₃处理的土壤磷淋失量明显高于PI和P₂处理的磷淋失量.以上结果说明,施磷量显著影响无机磷总量、各组分无机磷含量及其转化;在大于中等降雨条件下,高磷处理磷淋失量明显高于低磷处理磷淋失量.

关键词: 模拟降雨, 无机磷含量, 无机磷组分, 施磷量, 褐土

Abstract: Simulated soil column was used to study the effects of different P rates on inorganic P content and its trans2 formation in cinnamon soil under average rainfall of Shandong Province. Results showed that total inorganic phosphorus con2 tents of treatments applied with P increased in 0 - 10 cm soil layers when P application rates were increased after simulated rainfall;With plough layers were deepened(from 10 cm to 50 cm),the total inorganic P contents in different layers of P₂ (180 kg/ ha)were the highest. In 10 - 30 cm layers,the total inorganic P contentsof P₃(1 440 kg/ ha)were higher than those of P₁,while those of P₁in 30 - 50 cm layers were higher than those of P₃.At the same time,Contentsof inorganic Pfraction2 ations and the proportionsof those to total inorganic P contents were altered.When applied ratesof Pwere P₁,P₂,P₃,the in2 organic P fractionations and the proportionsof those to total inorganic P contents were shown asfollowsfrom high to low,re2 spectively:Ca₁₀2P >Al2P,O2P > Ca₈2P > Fe2P > Ca₂2P;O2P > Ca₈2P,Ca₁₀2P > Fe2P,Al2P >Ca₂2P and Ca₁₀2P,O2P > Fe2P, Ca₈2P >Al2P > Ca₂2P.With the soil layers rates deepened,the contents of O2P,Fe2P and Ca₁₀2P kept constant,while avail2 able inorganic P sources( Ca₂2P,Ca₈2P and Al2P)decreased;With the intensityof light rain,the P leaching amounts in soils of different treatments of P rates had no obvious differences,while rain intensity increased,soil P leaching amounts of P₃treatment were obviously higher that those of P₁and P₂treatments. Thus,different P rates had obvious effect on total inorgan2 ic P content,inorganic P contents and their transformation;under the rain intensity was over than medium rainfall,P leach2 ing amount of high phosphorus treatment was obviously higher than those of low P treatment

Key words: Simulated rainfall, Inorganic P content, Inorganic P fractionation, P rates, Cinnamon soil

中图分类号:

李彦, 高燕, 张英鹏, 孙明, 陈清. 模拟降雨条件下施磷量对褐土无机磷含量及形态转化的影响[J]. 华北农学报, 2009, 24(3): 194-200. doi: 10.7668/hbnxb.2009.03.041.

LI Yan, GAo Yan, ZHANG Ying peng, SUN Ming, CHEN Qing. Effects of P Rates on Different Fraction Inorganic P Content and Its Transformation in Cinnamon Soil under Simulated Rainfall Conditions[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2009, 24(3): 194-200. doi: 10.7668/hbnxb.2009.03.041.

http://www.hbnxb.net/CN/Y2009/V24/I3/194

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