| 西南喀斯特地区不同石漠化阶段土壤有效磷变异研究 |
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| 引用本文： | 周炼川,陈效民,李孝良,,杨新强,夏 雯.西南喀斯特地区不同石漠化阶段土壤有效磷变异研究[J].延边大学理工学报,2009,0(4):418-422. |
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| 作者姓名： | 周炼川 陈效民 李孝良 杨新强 夏 雯 |
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| 作者单位： | (1.南京农业大学 资源与环境科学学院,江苏 南京 210095; 2.安徽科技学院 植物科学学院,安徽 凤阳 233100) |
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| 摘 要： | 为了探索西南喀斯特地区土壤有效磷的变异规律,采用野外采样与实验室分析相结合的方法,对贵州省荔波县及普定县不同石漠化阶段典型土壤的有效磷含量进行了研究。结果表明:①非石漠化土壤与轻度石漠化土壤有效磷质量分数呈显著差异,非石漠化的黑色石灰土有效磷质量分数高达9.29×10-6,随着石漠化程度的加深,土壤有效磷含量逐渐减少;②土壤剖面中有效磷质量分数均表现为表土层高于心土层,且随着石漠化的发展,有效磷质量分数在剖面中减少得越慢;③土壤有效磷质量分数随时间有显著变化,有效磷从5月开始积累,7月后出现下降趋势,9月或11月又逐渐升高,到翌年1月达到峰值;④土壤有效磷与有机质和黏粒质量分数均呈极显著线性相关,相关系数分别为0.9017和-0.7772。这说明增加有机质的积累可提高土壤有效磷质量分数,对防治石漠化具有重要意义。
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| 关 键 词： | 喀斯特地区 石漠化阶段 土壤有效磷 变异 |
Study on Variation of Available Phosphorus of Soil in Karst Regions Under Rocky Desertification,Southwest China |
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| ZHOU Lian-chuan,CHEN Xiao-min,LI Xiao-liang,' target="_blank" rel="external">,YANG Xin-qiang,XIA Wen.Study on Variation of Available Phosphorus of Soil in Karst Regions Under Rocky Desertification,Southwest China[J].Journal of Yanbian University (Natural Science),2009,0(4):418-422. |
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| Authors: | ZHOU Lian-chuan CHEN Xiao-min LI Xiao-liang " target="_blank">' target="_blank" rel="external"> YANG Xin-qiang XIA Wen |
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| Affiliation: | (1.School of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, Jiangsu, China; 2.School of Plant Sciences, Anhui Science and Technology University, Fengyang 233100, Anhui, China) |
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| Abstract: | In order to explore the variation of soil available phosphorus in karst regions, methods of field sampling and indoor analysis are used. Soil samples were collected from Libo and Puding counties in Guizhou province, and the content of available phosphorus is studied. The results are as follows: ①There is significant difference in the content of available phosphorus between non-degraded and light degraded soils, and available phosphorus reached the highest content of 9.29×10-6 in non-degraded rending, and as the rocky desertification progresses, the content of soil available phosphorus decrease; ②Content of available phosphorus is higher in surface soil layer than that in bottom layer. It seems that rocky desertification could effect the reduction rate of available phosphorus in profiles; ③Content of available phosphorus varies with time significantly, available phosphorus accumulate from May to July, then the content does not increase until September or November and reaches the highest in next January; ④Content of available phosphorus has a quadratic relation with soil organic matter and clay, the correlation coefficient is 0.901 7 and -0.777 2 respectively, which is extremely significant. It suggests that the content of soil available phosphorus could be enhanced by increasing soil organic matter, which is important to prevent rocky desertification. |
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| Keywords: | karst region rocky desertification process available phosphorus of soil variation |
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