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。
Huajiang gorge is a typical comprehensive control area of karst plateau rocky desertification in Guizhou Province. To understand soil nutrient status and the correlation of physical and chemical factors of different restoration patterns, soil samples from 0-10, 10-20 and 20-30 cm under six restoration patterns were collected, with abandoned land as control. The results showed that soil organic carbon, total N, total P and total K contents of the six different restoration patterns were increased by 72%, 37%, 60% and 72% compared to the abandoned land, respectively. Soil available N, available P and available K contents were increased by 61%, 10% and 106%, respectively. Soil organic carbon and nutrient contents in different soil layers were significantly different; soil organic carbon, total N, total P, total K, available N, available P and available K contents in the 0-10 cm layers were 1.52, 1.14, 1.20, 1.06, 1.41, 1.27, and 1.29 times of those in the 20-30 cm layer respectively, showing a surface accumulation effect. Correlation analysis showed that soil organic matter and bulk density were the key factors in the soil physicalchemical factors of the gorge area, and vegetation factors and soil factors were the two important factors that need to be taken into account in screening restoration patterns and planting in rocky desertification control areas.
出处
《生态学杂志》
CAS
CSCD
北大核心
2017年第8期2094-2102,共9页
Chinese Journal of Ecology
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
关键词
喀斯特高原
花江
恢复模式
土壤养分
karst plateau
Huajiang
restoration pattern
soil nutrient
