生态环境学报2011，Vol.20Issue(2)：276-280,5.
不同退化程度喀斯特生态系统根际土壤的养分分布特征
Distribution characteristic of soil organic carbon, nitrogen and phosphorus of rhizosphere soil in different karst ecosystems with the change of degradation degree
摘要
Abstract
The experiment was performed to understand the impact of degradation level on the rhizosphere soil nutrients in the Karst ecosystems. The rhizosphere soil was separated from the fine roots of different dominant vegetations under three different vegetation types (forest, shrubs and grassland) in Karst mountainous area from Guizhou province, and further analysed for the C, N and P, pools (total and available contents). The results showed that both total and available pool of nutrient was highest for the rhizosphere of Plotycarya longipe under forest and was lowest for rhizosphere of Quercus fabric under forest as well. However, the dominant vegetations of forest resulted in the lowest, 10 mg/kg, pool of the average DOC (soluble organic C) in the rhizosphere. The P activation of Platycarya longipes and Kalopanax septemlobus Koidz in the rhizosphere under Forest was higher than others,particularly the P activation of Platycarya longipes was about 1.5％. Nutrient availability showed a prompt response to vegetation degradation. Moreover, a strong significant positive correlation was observed between the soil organic carbon, total nitrogen and available nitrogen. This indicated that the pool of soil nutrient was influenced by the change of dominant vegetation types in the Karst ecosystems.关键词
喀斯特/土壤养分/优势物种/根际土壤Key words
Karst/ soil nutrient/ dominant vegetation/ rhizosphere soil分类
农业科技引用本文复制引用
谢添,李恋卿,潘根兴,杜有新..不同退化程度喀斯特生态系统根际土壤的养分分布特征[J].生态环境学报,2011,20(2):276-280,5.基金项目
国家"973"重点基础研究发展计划项目(2006CB403205) （2006CB403205）
