狭叶锦鸡儿灌丛沙堆土壤水分和肥力的时空分布  

Spatiotemporal Distribution of Soil Moisture Content and Fertility of Caragana stenophylla Shrub Nabkhas in Different Habitats

作　　者：关林婧 梅续芳 张媛媛[1] 韩磊[1] 李清芳[1] 马成仓[1] 

机构地区：[1]天津师范大学生命科学学院,天津市动植物抗性重点实验室,天津300387

出　　处：《干旱区研究》2016年第2期253-259,共7页Arid Zone Research

基　　金：国家自然科学基金项目(31570453,31170381)

摘　　要：通过对内蒙古高原草原区、荒漠草原区和荒漠区狭叶锦鸡儿（Caragana stenophylla）不同发育阶段灌丛沙堆土壤有机质、全氮、全磷、速效磷和水分的空间分布研究。结果发现：3种生境中,灌丛土壤水肥含量表现为：草原区〉荒漠草原区〉荒漠区。在草原区和荒漠草原区,狭叶锦鸡儿灌丛沙堆土壤全氮和全磷随土层加深（0～10 cm、10～20 cm、20～40 cm）呈逐渐增加趋势,而速效磷和水分相反;草原区灌丛沙堆土壤有机质富集于0～10 cm土层,荒漠草原区富集于20～40 cm土层。在荒漠区,灌丛对水分和大部分养分（除速效磷）的层间分布影响不大,而20～40 cm土层的速效磷含量逐渐减少。3种生境中狭叶锦鸡儿灌丛内的养分含量均高于灌丛外相同土层,且随着灌丛增大,这种趋势越来越明显;在草原区,随着狭叶锦鸡儿冠幅增大,灌丛土壤水分含量呈显著下降趋势,在荒漠草原区和荒漠区,灌丛土壤水分含量随着灌幅增大而增加。这说明狭叶锦鸡儿灌丛改变了土壤水分和肥力的空间分布,这种效应是在灌丛沙堆的发育过程中逐渐形成,并体现出来的。In this study,the spatiotemporal distribution of the contents of soil moisture,organic matter,total N,total P and available P in soil of Caragana stenophylla shrub nabkhas at four developmental stages（ nonabkha,small nabkha,mid-sized nabkha and big nabkha） in the three habitats（ typical steppe,desert steppe and typical desert）on the Inner Mongolia Plateau were investigated. The results showed that the order of soil moisture content and fertility of C. stenophylla shrub nabkhas in the different habitats was as follows： Typical steppe〉 desert steppe 〉typical desert. In the typical steppe and desert steppe,the contents of total N and total P tended to increase with the expansion of C. stenophylla nebkhas and the increase of soil depth（ 0- 10 cm,10- 20 cm and 20- 40 cm）,but the available P content and moisture content tended to decrease. In the two habitats,organic matter was enriched at different soil depths： it was mainly distributed in 0- 10 cm soil depth in the typical steppe,and 20- 40 cm soil depth in the desert steppe. In the desert region,the influence of shrubbery on soil moisture content and most nutrients（ except available P） was not significant. In all three habitats,the soil nutrient contents inside of the shrub nebkhas were higher than those outside of the shrub nebkhas,and such trend became more and more obvious with the expansion of shrub nebkhas. However,soil moisture content was decreased with shrub growth in the typical steppe but increased in the desert steppe and desert region. These results suggested that C. stenophylla shrubs altered the spatial distribution of soil moisture and fertility,and such trend formed gradually with the development of C. stenophylla shrub nebkhas.

关 键 词：狭叶锦鸡儿(Caragana stenophylla) 灌丛沙堆 土壤水分 土壤肥力 空间分布 

分 类 号：S714[农业科学—林学]