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喀斯特低热河谷石漠化区环境梯度的小气候效应——以贵州花江峡谷区小流域为例

容丽1,2;王世杰1;杜雪莲1,2   

  1. 1中国科学院地球化学研究所环境地球化学国家重点实验室,贵阳 550002;2中国科学院研究生院,北京 100039

  • 收稿日期:2005-10-23 修回日期:2006-06-02 出版日期:2006-09-10 发布日期:2006-09-10

Microclimatic effects along environmental gradient in karst rocky desertified area:A case study of a small catchment in Huajiang Gorge of Guizhou Province

RONG Li1,2; WANG Shijie1; DU Xuelian1,2   

  1. 1State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China; 2Graduate University of Chinese Academy of Sciences, Beijing 100039, China

  • Received:2005-10-23 Revised:2006-06-02 Online:2006-09-10 Published:2006-09-10

摘要: 对典型喀斯特石漠化小流域区4种石漠化等级(潜在(L)、轻度(SL)、中度(M)、强度(ST)样地的小气候特征进行了监测,对比分析了它们的气温、相对湿度、光强分布和土壤温度、湿度分布状况和日变化动态。结果表明,各等级石漠化样地内光照强度、气温及其变动幅度的大小顺序为ST>M>SL>L;土温和土壤湿度及其变动幅度为M>ST>SL>L;大气相对湿度及其变动幅度为ST>M>SL>L。强度石漠化样地内日平均相对湿度雨季仅76%,旱季只有51%,分别与潜在石漠化相差13%和35%;光照强度为潜在的4倍以上;雨季气温高3 ℃;表土(5 cm)土温最高相差16.5 ℃;日均表土含水率低4.97%。随着石漠化程度的加深,退化生态系统的环境调蓄能力逐渐减弱。

关键词: 土壤生物修复, 矿物油, 多环芳烃, 植物, 微生物

Abstract: Based on the measurement of light intensity, air temperature, soil temperature, soil humidity, and relative humidity (RH) in a typical karst rocky desertified catchment of Huajiang Gorge of Guizhou Province, this paper compared and analyzed the distribution characteristics and daily changes of these microclimatic parameters on latent (L), slight (SL), medium (M), and strong (ST) rocky desertified lands. The results showed that light intensity, air temperature, and their changing amplitude followed the order of SE>M>SL>L, soil temperature and soil humility followed the order of M>SE>SL>L, and RH and its changing amplitude followed the order of SE>M>SL>L. Compared with those on latent rocky desertified land, the daily average RH on strong rocky desertified land was 13% less in rainy season and 35% less in dry season, light intensity was 4 times more, air temperature was 3 ℃ higher in rainy season, surface soil (0~5 cm) temperature had a 16.5 ℃ difference, and daily average soil water content was 4.97% less. All of these demonstrated that the modulation ability of karst ecosystem decreased seriously with increasing degree of karst rocky desertification.

Key words: Soil bioremediation, Mineral oil, PAHs, Plant, Microbes