Influence of arbuscular mycorrhizal fungi on soil structure and soil water characteristics of vertisols
Influence of arbuscular mycorrhizal fungi on soil structure and soil water characteristics of vertisols
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DOI：
10.1023/a:1004835328943
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发表时间：
2001-02-01
期刊：
影响因子：
4.9
通讯作者：
Bearden, BN
中科院分区：
文献类型：
--
作者：
Bearden, BN
研究了接种丛枝菌根真菌（AM真菌）对快湿和慢湿变性土土壤水分特征的影响。变性土的特点是对湿润的稳定性低，当它们膨胀时，它们的较大孔隙被破坏，导致水渗透减少，从而导致径流。团聚体分解的程度决定了土壤的排水能力。在该盆栽实验中使用变性土，具有四个处理：T-1：巴氏灭菌土壤，T-3：巴氏灭菌土壤，与植物，T-4：接种，巴氏灭菌土壤，与植物，T-5：未巴氏灭菌土壤，与植物。使用接种的巴氏灭菌土壤（T-2）的处理包括在比较团聚体稳定性的相关研究（比尔登和彼得森，2000年）中，本研究采用相同的编号，以帮助比较实验。在基质势低于-3.92kPa的条件下，接种AM真菌（T-4）的土壤在快速破坏性湿润后，其含水量低于其它处理。这表明更大的排水孔小于75 μ m接种AM真菌的土壤，更大的排水似乎是直接相关的特征孔范围在67和75 μ m之间。没有植物的土壤（T-1），当湿润快，有一个较低的土壤含水量在基质势高于-3.92 kPa比其他处理的土壤，这表明较小的孔隙体积，由于孔隙大于75微米的处理没有植物。孔隙指数，计算的斜率之间的比值的快速和缓慢润湿的水特性，一般有最高值接种AM真菌（T-4）从基质势0.00至-0.29 kPa的土壤。在此基质势范围内，孔隙指数均小于1。在基质势为-0.49 ~-3.92kPa范围内，接种AM真菌的未灭菌土壤（T-5）的孔隙指数普遍最高，且孔隙指数均大于1。这些结果表明，接种AM真菌的土壤（T-4）中非常大的孔隙损失最小，未巴氏灭菌的土壤（T-5）中较小尺寸孔隙的增加最大。这表明最大孔隙对破裂的抵抗力与根的存在有关，而较小孔隙组的增加与菌丝的存在有关。
The influence of inoculation with arbuscular mycorrhizal fungi (AM fungi) on soil water characteristics of fast and slowly wetted vertisol samples was studied. Vertisols characteristically have a low stability to wetting, and the disruption of their larger pores when they swell leads to reduced water infiltration and thereby to runoff. The degree of aggregate breakdown determines the ability of the soil to drain. A vertisol was used in this pot experiment with four treatments: T-1: Pasteurized soil, T-3: Pasteurized soil, with plants, T-4: Inoculated, pasteurized soil, with plants, T-5: Unpasteurized soil, with plants. A treatment using inoculated, pasteurized soil (T-2) was included in a related study (Bearden and Petersen, 2000) comparing aggregate stability, and the present study follows the same numbering to aid in comparison of experiments. After fast, disruptive wetting, the soil inoculated with AM fungi (T-4) was found to have a lower soil water content than did the soils from the other treatments at matric potentials lower than -3.92 kPa. This indicates greater drainage from pores smaller than 75 mum for the soil inoculated with AM fungi, and the greater drainage appears to be directly related to a characteristic pore range between 67 and 75 mum. The soil without plants (T-1), when wetted fast, had a lower soil water content at matric potentials higher than -3.92 kPa than soils from the other treatments, which indicates less pore volume due to pores larger than 75 mum in the treatment without plants. The pore indexes, calculated as the ratio between the slope of the fast and the slope of the slowly-wetted water characteristics, generally had the highest values for the soil inoculated with AM fungi (T-4) from matric potential 0.00 to -0.29 kPa. In this matric potential range, the pore indexes were less than one. The unpasteurized soil with naturally present AM fungi (T-5) generally had the highest pore indexes from matric potential -0.49 to -3.92 kPa, and the pore indexes in this matric potential range were above one. These results indicate the smallest loss of very large pores in the soil inoculated with AM fungi (T-4) and the largest gain of smaller sized pores in the unpasteurized soil (T-5). This suggests that the resistance to breakdown of the largest pores is related to the presence of roots, and that the gain of groups of smaller pores is related to the presence of hyphae.