摘要
为探讨绿洲化进程中不同土地利用方式对土壤粒径分布属性的影响,基于塔里木盆地南缘策勒绿洲边缘的果园、棉田、沙拐枣林地等人为垦殖土地利用方式及自然状态骆驼刺覆被下0～20,20～40,40～60cm内的土壤粒径分布数据,利用分形理论及典范对应分析排序方法,分析各深度下不同土地利用方式土壤粒径分布特征变化状况,及其与土壤有机质等8项指标的相关性,进而判别并探讨绿洲边缘合理的土地利用方式。结果表明:粒径50.59μm范围内的细粒体积分数同粒径分布分维值显著正相关,与土壤有机质、全氮含量呈显著正相关,与密度呈显著负相关;具体分维值变化上,沙拐枣林地在各层均显著处于最低水平,其余样地总体上无显著差异,但果园相对处于高位水平;自然状态下骆驼刺样地随着土壤深度增加分维值有增加的趋势,其对土壤养分的持有力也逐渐优于其余样地。在水资源相对有保障前提下,在绿洲边缘发展果园或棉田有利于土壤粒径分布及其余属性的提高,相反,则应保持原有的自然植被状况,而对自然植被进行替代的沙拐枣林地则会加剧土壤退化。
In this paper,the effects of different land-use types on soil particle size distribution in the process of oasisization were detected based on a survey conducted in orchard,cotton farmland and Caligonum mongolicum plantation and naturally regenerated Alhagi sparsifolia vegetation in the rim of Cele oasis located in south rim of Tarim Basin.Soil samples were collected in the depth of 0 - 20,20 - 40,40 - 60 cm respectively,and the characteristics of soil particle size distribution in the different vegetation soil were analyzed using the fractal theory and canonical correspondence analysis.The correlation between particle size distribution and other eight soil properties,such as soil organic matter etc.,was also analyzed.Then the rational land-use types in oasis rim were further discussed and identified.Results showed that the volume content of soil fine fractions （lower than 50.59 μm） had significantly positive correlation with the fractal dimension value of particle size distribution,also had significantly positive correlation with the content of soil organic matter and total nitrogen,and had significantly negative correlation with bulk density.C.mongolicum forest had the lowest variation in fractal dimension values at each soil depth,and other land-use types had no significant difference in the values but the orchard was relatively higher.The natural state land-use type covered by A.sparsifolia had a trend that fractal dimension value gradually increased with increasing soil depth,and its ability to hold soil nutrients was gradually stronger than other land-use types.These results indicated that development of orchard or cotton farmland was beneficial to maintaining or improving soil particle size distribution and other soil properties with a precondition that the water supply would be ensured.To the contrast,the natural vegetation should be maintained,and replacement of the natural vegetation by C.mongolicum forests could exacerbated the soil degeneration.
出处
《林业科学》
EI
CAS
CSCD
北大核心
2011年第1期22-28,共7页
Scientia Silvae Sinicae
基金
国家自然科学基金资助项目(41001171)
国家重点基础研究发展计划(2009CB421302)
关键词
土壤粒径分布
分形维
典范对应分析
绿洲
塔里木盆地
soil particle size distribution
fractal dimention
canonical correspondence analysis
oasis
Tarim Basin
