绿洲农田不同深度土壤粒径分布特性及其影响因素——以策勒绿洲为例

干旱区研究 ›› 2011, Vol. 28 ›› Issue (4): 622-629.

绿洲农田不同深度土壤粒径分布特性及其影响因素——以策勒绿洲为例

桂东伟^1,2, 雷加强^1,2, 曾凡江^1,2, 穆桂金^1,2, 潘燕芳^1,2,3, 李开封^1,2,3

1. 中国科学院新疆生态与地理研究所, 新疆乌鲁木齐 830011;
2. 新疆策勒荒漠草地生态系统国家野外科学观测研究站, 新疆策勒 848300;
3. 中国科学院研究生院, 100039

收稿日期:2010-06-29 修回日期:2010-10-21 出版日期:2011-08-25 发布日期:2011-09-06
作者简介:桂东伟(1977-),男,新疆乌鲁木齐人,博士,主要从事荒漠环境研究.E-mail:guidwei@163.com
基金资助:
新疆科技重大专项(200733144-2);国家自然科学基金项目(41001171);国家重点基础研究发展计划(2009CB421302)资助

Analysis on Soil PSD and Its Affecting Factors at Different Depths in Oasis Farmland —A Case Study in the Qira Oasis

GUI Dong-wei^1,2, LEI Jia-qiang^1,2, ZENG Fan-jiang^1,2, MU Gui-jin^1,2, PAN Yan-fang^1,2,3, LI Kai-feng^1,2,3

1. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;
2. Qira National Station for Desert Steppe Ecosystem Observation & Research, Qira 848300, Xinjiang, China;
3. Graduate University, Chinese Academy of Sciences, Beijing 100039, China

Received:2010-06-29 Revised:2010-10-21 Published:2011-08-25 Online:2011-09-06

摘要/Abstract

摘要： 绿洲土壤环境变异状况及其影响因素的研究对于维护绿洲稳定、绿洲化进程的合理发展具有重要意义。以塔里木盆地南缘策勒绿洲为研究区,根据农田为绿洲主要土地利用方式的特点,通过其不同深度土壤粒径分布(PSD)物理特性的探讨,描述绿洲农田PSD的差异性,同时对其影响因素进行分析。基于绿洲范围内取样点0～20 cm,20～40 cm,40～60 cm和80～100 cm深度PSD数据,利用分形理论对PSD进行描述,通过PSD分维值的计算比较、聚类分析,结果表明:取样点间各深度PSD均存在显著性差异,其中农田利用年限及空间位置差异性是PSD分异的主要原因。在60 cm深度范围内,农田利用年限是PSD分异的主导因素,尤其对0～20 cm深度PSD影响显著;而随着深度增加其影响逐渐减弱,80～100 cm深度则已无重要影响。因此,在绿洲及绿洲化进程中,保障农田的可持续性耕作将对PSD及土壤环境产生积极的影响。

关键词: 绿洲, 农田, 土壤粒径分布, 分形理论, 策勒

Abstract: It is important to characterize the change of soil environment and its affecting factors in oasis for protecting oasis stability and achieving rational development in the process of oasification. In this study, the Qira Oasis was selected as the study area to analyze the change of soil particle size distribution (PSD, an important soil physical property) and its affecting factors at different depths based on the fact that farmland was the main land use type in the oasis. Fractal theory was used to describe PSD based on the PSD data at depths of 0-20 cm, 20-40 cm, 40-60 cm and 80-100 cm in sample plots in the oasis. According to the comparing and clustering analysis of PSD fractal dimension, the study result revealed that there was a significant difference of PSD among the sample plots at each depth, and the differences of farmland use years and locations were the main reasons resulting in the difference of soil PSD. At the depth of 60 cm, the dominant factor resulting in the difference of soil PSD was the farmland use years, especially at depth of 0-20 cm. However, its effect was gradually decreased with the increase of depth, and even there was no any important effect at depth of 80-100 cm. Therefore, there is a positive effect for PSD and soil environment to protect farmland which ensure the sustainable cultivation of farmland in the process of oasification.

Key words: oasis, farmland, soil particle size distribution, fractal theory, Qira

中图分类号:

S152.3

桂东伟, 雷加强, 曾凡江, 穆桂金, 潘燕芳, 李开封. 绿洲农田不同深度土壤粒径分布特性及其影响因素——以策勒绿洲为例[J]. 干旱区研究, 2011, 28(4): 622-629.

GUI Dong-wei, LEI Jia-qiang, ZENG Fan-jiang, MU Gui-jin, PAN Yan-fang, LI Kai-feng. Analysis on Soil PSD and Its Affecting Factors at Different Depths in Oasis Farmland —A Case Study in the Qira Oasis[J]. , 2011, 28(4): 622-629.

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