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中国农学通报 ›› 2015, Vol. 31 ›› Issue (24): 195-198.doi: 10.11924/j.issn.1000-6850.casb15050006

• 资源 环境 生态 土壤 气象 • 上一篇    下一篇

基于137Cs示踪法的滇东喀斯特“红裸土”景观形成的侵蚀证据研究

余洁芳,王嘉学,许路艳,代云川,肖梦景,赵 茜   

  1. (云南师范大学旅游与地理科学学院,昆明 650500)
  • 收稿日期:2015-05-04 修回日期:2015-06-30 接受日期:2015-07-08 出版日期:2015-08-26 发布日期:2015-08-26
  • 通讯作者: 余洁芳
  • 基金资助:
    国家自然科学基金“滇东石漠化地区红裸土景观的形成研究”(41061021);云南省科技计划专项“基于多学科高技术的云南‘城镇上山’研究与典型示范”(2012CA024)。

Erosion Evidence Research of “Red-Bare Soil” Erosion Evidence Research of “Red-Bare Soil” Formation in the Karst Area of Eastern Yunnan Based on 137Cs Trace Method

Yu Jiefang, Wang Jiaxue, Xu Luyan, Dai Yunchuan, Xiao Mengjing, Zhao Qian   

  1. (School of Tourism and Geographical Science, Yunnan Normal University, Kunming 650500)
  • Received:2015-05-04 Revised:2015-06-30 Accepted:2015-07-08 Online:2015-08-26 Published:2015-08-26

摘要: 为定量探究“红裸土”景观形成与土壤侵蚀之间的联系,笔者采用137Cs示踪法,分析了同一坡度3种不同覆被条件下土壤137Cs变化特征。结果表明:该区域的137Cs背景值为878.41 Bq/m2137Cs在山原红壤剖面中的分布深度较浅,通常在15 cm以内;经测算,云南松林覆被下的土壤侵蚀速率为1252.34 t/(km2·a),草丛覆被下的土壤侵蚀速率为3069.718 t/(km2·a),“红裸土”中未能测到137Cs,土壤侵蚀速率呈现出“红裸土”>草丛>松林的侵蚀趋势。山原红壤覆被条件劣化是导致土壤侵蚀速率增大的重要原因,土壤侵蚀是“红裸土”景观形成的重要因素,植被保育是控制“红裸土”景观形成的关键。

关键词: 甜瓜, 甜瓜, 配方施肥, 数学模型, 交互效应

Abstract: In order to study the connection between landscape formation of “red-bare soil” and soil erosion, 137Cs change features of 3 different cover conditions under the same gradient were analyzed by the method of 137Cs trace. The results showed that: the background value of 137Cs was 878.41 Bq/m2; the distribution of 137Cs in the profile of mountain-bare-soil was relatively shallow, which was within 15 cm usually. The soil erosion rate under the Yunnan pine forest land-cover was 1252.34 t/(km2·a) and it was 3069.718 t/(km2·a) under grass land-cover, the 137Cs was not detected in the “red-bare soil”. The soil erosion rate followed the tendency of “red-bare-soil”>grass>pine forest. The worsening condition of mountain red earth land-cover was the fatal factor which contributed to the increase of soil erosion rate, soil erosion was the critical factor to the formation of “red-bare-soil”, and vegetation nursing was the key to control the formation of the “red-bare soil”.