贵州喀斯特高原花江峡谷区不同恢复模式的土壤养分特征

发布时间：2018-07-12 21:50

本文选题：喀斯特高原 + 花江　；参考：《生态学杂志》2017年08期

【摘要】：贵州省花江峡谷是典型的喀斯特高原石漠化综合治理区,为研究区内不同恢复模式对土壤养分状况的影响,选取人工种植的花椒、构树、砂仁、金银花、火龙果以及花椒与金银花混交形成的混交林共6种恢复模式的林地土壤作为研究对象,以荒草地为对照,采集0~10、10~20、20~30 cm处土样,研究土壤养分状况及理化因子的相关关系。结果表明:6种恢复模式的土壤有机碳、全氮、全磷、全钾均值分别较荒草地提高了72%、37%、60%、72%,土壤碱解氮、有效磷、有效钾均值分别较荒草地提高了61%、10%、106%;不同恢复模式的土壤有机碳和养分含量在土层间的垂直分布上存在较大差异,表层土壤有机碳、全氮、全磷、全钾、碱解氮、有效磷、有效钾含量分别为20~30 cm层的1.52、1.14、1.20、1.06、1.41、1.27、1.29倍,从而表现出"表聚效应";相关分析表明,土壤有机质和容重是土壤理化因子中的关键因子,植被因素和土壤因素是石漠化治理区进行恢复模式筛选和种植需要考虑的2个重要因素。
[Abstract]:The Huajiang Canyon in Guizhou province is a typical Karst plateau rock desertification comprehensive control area, which affects the soil nutrient status of different restoration patterns in the study area. The cultivated land of 6 restoration models of mixed forest of pepper, tree, Amomum, honeysuckle, pitaya and the mixed forest of pepper and honeysuckle is selected as the research object. Taking the grassland as the control, the soil samples at 0~10,10~20,20~30 cm were collected to study the soil nutrient status and the relationship between the physical and chemical factors. The results showed that the average value of soil organic carbon, total nitrogen, total phosphorus and total potassium in the 6 recovery modes increased by 72%, 37%, 60%, 72%, respectively, and the mean value of soil alkali hydrolysable nitrogen, available phosphorus and effective potassium increased 61 respectively. %, 10%, 106%; the vertical distribution of soil organic carbon and nutrient content between soil layers in different recovery modes is different. The surface soil organic carbon, total nitrogen, total phosphorus, total potassium, alkali hydrolysable nitrogen, effective phosphorus and effective potassium are 1.52,1.14,1.20,1.06,1.41,1.27,1.29 times of the 20~30 cm layer respectively, thus showing the "surface aggregation effect"; correlation analysis shows that Soil organic matter and bulk density are the key factors of soil physical and chemical factors, and vegetation factors and soil factors are 2 important factors that need to be considered for the screening and planting of the restoration model in the rocky desertification control area.
【作者单位】：贵州大学林学院;贵州省林业厅;
【基金】：贵州省重大科技专项项目(黔科合JZ字[2014]200211 黔科合重大专项字[2016]3022号) 贵州省社发攻关项目(黔科合SY字[2013]3165号)资助
【分类号】：S158

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