生态环境学报2016，Vol.25Issue(6)：947-955,9.DOI:10.16258/j.cnki.1674-5906.2016.06.006
喀斯特石漠化生态恢复过程中土壤质量变化分析--以古周生态恢复重建区为例
An Analysis of Soil Quality Changes in the Process of Ecological Restoration in Karst Rocky Desertification Area:A Case Study in Karst Ecological Restoration and Rehabilitation Region of Guzhou Village
摘要
Abstract
Serious soil erosion and drastic decrease in soil productivity caused by karst rocky desertification can endanger the functions of karst ecosystem. Thus, to better understand the changes of soil quality in the process of ecological restoration, which can provide scientific basis for soil nutrient regulation, is important for ecosystem management in vulnerable karst rocky desertification area. This study was conducted in the karst ecological restoration and rehabilitation region of Guzhou village, 21 typical sample plots of Zenia insignis along a rocky desertification gradient were selected based on field survey and literature search, among which 9 sample plots are on a slope and 12 sample plots are in a depression area. Soil samples were collected along a rocky desertification gradient(potential rocky desertification, slight rocky desertification, moderate rocky desertification, and severe rocky desertification), and the changes of soil quality in different layer, indicating by soil bulk density, soil water content, pH value, soil organic matter, soil total nitrogen, soil total phosphorus , soil total potassium , available nitrogen, available phosphorus, and available potassium, were studied using laboratory analysis method. Results showed that, (1) Vegetation recovery in rocky desertification area provided more organic matter to the soil and therefore resulted in the increase of soil nutrient contents. (2) During the process of ecological restoration, soil quality was getting better and vegetation was accordingly growing better, which indicated that the effect of rocky desertification control effect was obvious. This also indicated that there was a positive relationship between the improvement of soil quality and the restoration of karst ecosystem in rocky desertification area. (3) From severe rocky desertification to slight rocky desertification, the average of total nitrogen in the slope area increased from 1.22 g·kg-1 to 1.88 g·kg-1, by 54.10%;the average of total nitrogen in the depression area increased from 1.13 g·kg-1 to 1.36 g·kg-1, only for 20.35%. The average of available nitrogen in the slope area increased from 84.55 mg·kg-1 to 164.31 mg·kg-1, by 94.33%;the average of available nitrogen in the depression area increased from 41.90 mg·kg-1 to 82.57 mg·kg-1, by 97.06%. The average of available potassium in the slope area increased from 36.61 mg·kg-1 to 58.52 mg·kg-1, by 59.85%;the average of available potassium in the depression area increased from 15.02 mg·kg-1 to 28.09 mg·kg-1, by 87.02%. (4) There is a synchronous relationship between the changes of soil quality and the process of eco-restoration in karst rocky desertification area. With the improvement of the rocky desertification, soil water content, soil organic matter, soil organic carbon, total nitrogen, available nitrogen, and available potassium showed an increasing trend, while soil bulk density and pH value showed a decreasing trend, which indicated an increase in soil fertility.关键词
喀斯特/石漠化生态恢复过程/土壤质量/人工任豆林Key words
karst/the process of eco-restoration in karst rocky desertification area/soil quality/plantation forest of zenia insignis分类
资源环境引用本文复制引用
汪明冲,张新长,李辉霞,周红艺,魏兴琥,关共凑..喀斯特石漠化生态恢复过程中土壤质量变化分析--以古周生态恢复重建区为例[J].生态环境学报,2016,25(6):947-955,9.基金项目
国家自然科学基金项目（41401108）；中国教育部人文社会科学研究规划基金项目 （）
