贵州毕节地区不同石漠化程度土壤理化性质特征

发布时间：2018-05-12 12:33

本文选题：石漠化 + 土壤理化性质　；参考：《水土保持学报》2017年04期

【摘要】：为揭示喀斯特地区不同石漠化程度土壤理化性质特征及其影响机制,以贵州毕节石漠化地区土壤为研究对象,在雨季前、中、后对潜在、轻度、中度、强度石漠化程度的土壤进行了为期4年的监测,分析了不同石漠化程度土壤理化性质及其各项指标之间的相关性特征。结果表明:同一石漠化程度下,土壤有机质、全磷、有效磷、全氮和水解氮含量表现为雨季中雨季后雨季前。随着石漠化程度的加深,土壤田间持水量、毛管持水量、毛管孔隙度和总孔隙度升高,全磷、有效磷和有机质含量减少。与潜在石漠化程度相比,轻度、中度和强度石漠化程度的土壤全氮含量分别增加5.6%,20.9%,26.6%,水解氮含量分别增加3.5%,18.3%,36.2%,全钾含量分别增加15.8%,30%,46.3%,速效钾含量分别增加3.9%,11.3%,16.5%。相关性分析结果显示,土壤有机质、全磷、全氮含量、土壤容重、总孔隙度、毛管持水量之间相关性显著(p0.05),其中土壤有机质含量、全氮含量、容重、总孔隙度间相关性极显著(p0.01)。研究结果为石漠化综合治理工作提供理论与科学依据。
[Abstract]:In order to reveal the physical and chemical properties of soils with different rocky desertification degrees and their influencing mechanisms in karst areas, the soil in Bijie rocky desertification area, Guizhou Province, was studied before, during and after the rainy season. The soil with rocky desertification intensity was monitored for 4 years. The physical and chemical properties of the soils with different rocky desertification degrees and the correlation characteristics among the indexes were analyzed. The results showed that the contents of organic matter, total phosphorus, available phosphorus, total nitrogen and hydrolyzed nitrogen in the soil under the same rocky desertification degree were before the rainy season after the rainy season. With the deepening of rocky desertification, the soil water holding capacity, capillary porosity and total porosity increased, and the contents of total phosphorus, available phosphorus and organic matter decreased. Compared with the potential rocky desertification degree, the soil total nitrogen content of mild, moderate and intensity rocky desertification degree increased by 5.6 ~ (th) and 20.9m ~ (26.6), the hydrolytic nitrogen content increased by 3.5N ~ (18. 3) and 36.2%, the total potassium content increased by 15.830 ~ (30) ~ 46.3s, and the available potassium content increased by 3.911.3n ~ (16.5m) ~ (16. 5) respectively. The results of correlation analysis showed that soil organic matter, total phosphorus, total nitrogen content, soil bulk density, total porosity and capillary water capacity were significantly correlated with soil organic matter content, total nitrogen content, bulk density and total porosity, among which the correlation between soil organic matter content, total nitrogen content, bulk density and total porosity was extremely significant (p 0.01). The results provide theoretical and scientific basis for comprehensive control of rocky desertification.
【作者单位】：贵州师范大学喀斯特研究院/国家喀斯特石漠化防治工程技术研究中心;
【基金】：国家“十三五”重点研发计划项目(2016YFC0502607) 贵州省科技计划重大专项(黔科合重大专项字[2014]6007号) 贵州师范大学博士科研启动基金项目(2017)
【分类号】：S153

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