| 鄂尔多斯沙地土壤生物结皮的理化性质 |
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| 引用本文： | 崔燕,吕贻忠,李保国.鄂尔多斯沙地土壤生物结皮的理化性质[J].土壤,2004,36(2):197-202. |
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| 作者姓名： | 崔燕 吕贻忠 李保国 |
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| 作者单位： | 中国农业大学资源与环境学院,教育部土壤--植物重点实验室,北京,100094 |
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| 基金项目： | 国家自然科学重大基金项目(39990490)资助 |
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| 摘 要： | 本文通过野外取样和室内分析相结合, 对鄂尔多斯沙地不同植物群落下的土壤生物结皮的理化性质进行了初步的研究。研究表明沙地固定的时间越久,其下的生物结皮越多,厚度也越大,结皮的厚度在0.3 ~ 1.5cm之间;在流动沙丘表面形成生物结皮后,结皮中的颗粒组成发生明显的变化,其中0.25 ~ 0.05mm级别的粗砂粒明显减少,而且随着结皮形成的厚度增加,其减少的幅度越大,最大减少的幅度可达30%;随着结皮厚度的增加,结皮的容重也明显增大,室内测定的毛管持水量明显增加,表现出强烈非孔隙吸水现象。但较厚的生物结皮也具有明显的阻水作用,也是导致老固定沙丘植物群落衰退的原因之一。结皮厚度越大,其有机质、全N、全P、速效N、速效P、速效K含量也越高,且以沙地柏下的各种养分含量最高,结皮中的最高有机质含量是流沙的13.5倍(未除去生物残体时),说明生物结皮具有显著的养分富积作用。随着有机含量的增加,其C/N和C/P比呈增加趋势,而pH有轻微的下降趋势。总之,通过对鄂尔多斯沙地生物结皮的初步分析,可以明显看出沙地生物结皮对土壤理化性质有明显的影响,对沙地的生态系统的影响需要进一步研究。
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| 关 键 词： | 鄂尔多斯沙地 生物结皮 养分 水分 |
PHYSICO-CHEMICAL PROPERTIES OF SOIL MICROBIOTIC CRUSTS ON ERDOS PLATEAU |
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| CUI Yan,LV Yi-zhong and LI Bao-guo.PHYSICO-CHEMICAL PROPERTIES OF SOIL MICROBIOTIC CRUSTS ON ERDOS PLATEAU[J].Soils,2004,36(2):197-202. |
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| Authors: | CUI Yan LV Yi-zhong and LI Bao-guo |
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| Institution: | Resources and Environment College, Soil-Plant LAB, China Agricultural University, Beijing 100094,Resources and Environment College, Soil-Plant LAB, China Agricultural University, Beijing 100094 and Resources and Environment College, Soil-Plant LAB, China Agricultural University, Beijing 100094 |
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| Abstract: | Soil microbiotic crusts play an important role in the tibba ecosystem. By field sampling, some original soil microbiotic crusts were gathered and their physico-chemical properties were analyzed. The results revealed that the longer the sand dunes have been fixed, the thicker and the more biocrusts are formed. The thickness of the crusts under four different types of plant community ranges within 0.3 ~ 1.5cm. The fraction of coarse sands in the crusts (0.25 ~ 0.05mm) decreased by as much as 30%, and the thicker the microbiotic crusts, the less the coarse sands. But the bulk density of the microbiotic crusts increased with the thickness, and so did the capillary moisture capacity. The reason maybe is the high moisture absorption by biomaterial like lichen, algae, etc in the soil microbiotic crust. However thick microbiotic crusts might hinder water movement. Nutrient analysis of the crusts revealed that as the crusts increased in thickness. SOM, total N, available N increased remarkably, total P and available P increased a little and pH decreased slightly, which illuminated the soil microbiotic crusts had a strong function of enriching soil water and soil nutrients in the Erdos Tibba (semi-arid). |
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| Keywords: | Erdos plateau Microbiotic crust Soil nutrient Soil water |
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