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煤矸山复垦林、草地土壤有机碳差异及其影响因素

王蕾,张宇婕,于亚军*   

  1. (山西师范大学地理科学学院, 山西临汾 041000)
  • 出版日期:2019-12-10 发布日期:2019-12-10

The variation of soil organic carbon and its influencing factors between reclaimed woodland and grassland in coal waste pill.

WANG Lei, ZHANG Yu-jie, YU Ya-jun*   

  1. (College of Geography, Shanxi Normal University, Linfen 041000, Shanxi, China).
  • Online:2019-12-10 Published:2019-12-10

摘要: 土壤有机碳及其活性组分既能表征土壤肥力状况,又可反映土壤质量变化。因此,研究煤矸山不同植被复垦地土壤有机碳含量差异及其影响因素,有助于查明不同植被复垦方式下土壤肥力和质量状况的差异及其原因,对于指导煤矸山植被恢复具有重要意义。以山西省霍州曹村煤矸山复垦后9年的草地和林地为对象,分析了2种植被类型复垦地0~10和10~20 cm土层总有机碳(SOC)、可溶性有机碳(DOC)、水溶性有机碳(WSOC)、微生物生物量碳(MBC)、轻组有机碳(LFOC)和重组有机碳(HFOC)的差异,研究了土壤有机碳组分含量与土壤环境因子间的关系。结果表明:(1)复垦草地SOC和HFOC含量分别较复垦林地高26.1%和70.5%(P<0.05),LFOC含量则低53.1%(P<0.05),但2种样地中DOC、WSOC和MBC含量相当。表明复垦草地土壤总有机碳含量高于复垦林地,且主要增加了重组有机碳含量,但其活性组分并无明显差异。(2)土壤TN、TP、AN、C/N、黏粒含量和pH值均对土壤SOC及其组分产生影响,其中TN、AN、TP和pH值是造成2种复垦样地有机碳及其组分含量差异的主要因子。因此,提高土壤氮、磷含量,降低pH值可能会促进煤矸山复垦地土壤有机碳的积累。

关键词: 模拟, PM2.5, 绿色空间, 滞尘服务, 海淀区

Abstract: Soil organic carbon and its active components represent soil fertility and are sensitive to changes of soil quality. This study examined soil organic carbon and its influencing factors under different reclaimed vegetations of coal waster pile. Findings from this study are of great significance to ascertain the quality and fertility of reclaimed soil and to guide the selection of vegetation types for the reclamation of coal waster pile. The concentrations of total soil organic carbon (SOC), dissolved organic carbon (DOC), watersoluble organic carbon (WSOC), microbial biomass carbon (MBC), light fraction organic carbon (LFOC), and heavy fraction organic carbon (HFOC) in 0-10 cm and 10-20 cm soil layers were measured in two land types (grassland and woodland reclaimed for nine years) of Caocun coal waste pile in Huozhou, Shanxi Province. The relationships between soil organic carbon content and soil environmental factors were analyzed. The results showed that: (1) SOC and HFOC contents in grassland were 26.1% and 70.5% higher than that in woodland, and the LFOC contents was 53.1% lower, while the DOC, WSOC and MBC were similar in both vegetation types. This result indicated that the concentrations of SOC in grassland was higher than that in woodland, and such increment was mainly embodied by HFOC content. There was no significant difference in the active components of SOC. (2) Soil TN, TP, AN, C/N, clay content, and pH affected SOC and its active components. Specifically, soil TN, AN, TP, and pH were the key factors influencing SOC and its components under both vegetation types. Therefore, improving soil N, P and reducing soil pH may promote the accumulation of soil organic carbon in reclaimed soil in coal waster pile.

Key words: PM2.5, simulation, green space, dust detention service, Haidian District.