地理科学 ›› 2005, Vol. 25 ›› Issue (3): 322-328.doi: 10.13249/j.cnki.sgs.2005.03.322

• 论文 • 上一篇    下一篇

陕西咸阳人工林地土壤干层研究

赵景波1,2, 杜娟1, 周旗1, 岳应利1   

  1. 1. 陕西师范大学旅游与环境学院, 陕西 西安 710062;
    2. 中国科学院 地球环境研究所黄土与第四纪地质国家重点实验室, 陕西 西安 710075
  • 收稿日期:2004-05-26 修回日期:2004-10-09 出版日期:2005-05-20 发布日期:2005-05-20
  • 基金资助:
    陕西省自然科学基金项目(2002D02)、中国科学院黄土与第四纪地质国家重点实验室项目(SKLLQG0411)国际地质对比计划项目(IGCP448)

Dry Layer of Soil Below Artificial Forest near Xianyang in Shaanxi

ZHAO Jing-Bo1,2, DU Juan1, ZHOU Qi1, YUE Ying-Li1   

  1. 1. College of Tourism and Environment Science, Shaanxi Normal University, Xi'an, Shaanxi 710062;
    2. State Key Laboratory of Loess and Quaternary Geology, Environmental Institute of Earth, Chinese Academy of Sciences, Xi'an, Shaanxi 710075
  • Received:2004-05-26 Revised:2004-10-09 Online:2005-05-20 Published:2005-05-20

摘要: 根据咸阳庞西村苹果林地、梧桐林地和草地土壤含水量测定,研究了0~6m土壤含水量的变化和土壤干层特点与分布。结果显示, 咸阳人工林地从表层向下含水量呈现由高到低再到低的变化;10龄苹果林地2~4m深处土壤含水量平均为8.3%,12龄梧桐林2~4m深处土壤含水量平均为8.6%,均发育了明显的土壤干层;4龄苹果林下土层有干化显示,但无干层发育;草地土层含水量明显较苹果林地高,无土壤干化的显示。研究表明,土壤干层形成的具体原因一是降水量少决定的薄膜水带埋藏深度小,二是薄膜水的运移速度缓慢和含水量低。为保持人工林基本正常的生长和土壤水的正常运移,应避免严重的土壤干层出现。咸阳附近土壤干层的出现表明土壤干层在黄土高原广泛分布,该区的植被恢复首先应以疏林或森林草原为主,待土壤水分改善后再考虑恢复森林植被。

Abstract: According to soil moisture content determination of apple forest land and the Chinese parasol forest land at Pangxi and Dongshi villages in Xianyang, the change of 0-6-m soil moisture content and the characteristic and the distribution of dry soil layers were studied in this paper. The result shows that the soil moisture content in 6-m soil profile under artificial forest in Xianyang is high in the upper layer and becomes low in the middle and then become high in the lower layer; mean soil moisture content is 13.2% in 0-1-m earth layer under 10-year apple forest, 8.3% in 2-4-m earth layer, and 10.8% in the 4-6-m earth layer. Mean soil moisture content under Chinese parasol trees forest grown for 12 years is 12.8% in 0-1-m earth, 8.6% in 2-4-m earth layer, and 12.2% in the 4-6-m deep earth layer. Mean soil moisture content is 12.4% in 0-1-m earth layer under 4-year apple forest, 11.9% in 1-4-m earth layer, and 13.6% in the 4-6-m earth layer. Mean soil moisture content is 12.3% in 0-1-m earth layer under grassland, 13.2% in 1-4-m earth layer, and 14.5% in the 4-6-m earth layer. The change of the above mentioned indicates that, dried soil layer develops in 2-4-m earth layer under 10-year apple forest and 12-year Chinese parasol trees forest; soil drying also occurs in 2-4-m under 4-year apples forest, but has no the development of dry soil layer. The soil moisture content is obviously higher in grassland than in the apple forest land, soil drying does not occur in grassland. The research result indicated that one of development causes of dry soil layer is that burial depth of film water belt is small, which is decided by the a little precipitation; anthor is slowly moving speed of the film water and low moisture content. In order to maintain normal growth of the artificial forest and the normal circulation of soil water, we should avoid the development of serious dry soil layer. The development of the obvious dry soil layer nearby Xianyang indicates that the soil drying layer is distributed widespread in the Loess Plateau, and the vegetation reconstruction in this area should first develop the thin forest or the forest-steppe, then restore the forest vegetation after the soil moisture improvement. Taking the project measure and improving soil structure, enhancing soil permeability, also can increase burial depth of film water belt and reduces the development intensity of dry soil layer.

中图分类号: 

  • S152.7