Spatial variation of soil enzyme activities and microbial functional diversity in temperate alley cropping systems
Spatial variation of soil enzyme activities and microbial functional diversity in temperate alley cropping systems
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DOI：
10.1007/s00374-005-0005-1
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发表时间：
2005-07
影响因子：
6.5
通讯作者：
N. Mungai;P. Motavalli;R. Kremer;K. Nelson
中科院分区：
文献类型：
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作者：
N. Mungai;P. Motavalli;R. Kremer;K. Nelson
在温带小巷种植系统中，由于树木下的凋落物质量和小气候与小巷中的微生物特性存在空间依赖性模式。树行位置的影响进行了评估，其对土壤酶活性和Biolog基质使用模式的影响。在两个地点的树行和小巷中间30厘米深的土壤取样：21岁的山核桃（Carya illinoinensis）/早熟禾（Poa trivials）间作（山核桃网站）和12岁的银枫（Acer saccharinum）/大豆（Glycine max）-玉米（Zea mays）轮换（枫树网站）。2001年秋季和2002年夏季进行了抽样。结果表明，在Pecan试验点，乔木层土壤的β-葡萄糖苷酶活性、Biolog模式（平均井色、基质丰富度和Shannon多样性指数）以及凯氏氮总量均显著高于（P<0. 05）小巷中部土壤。黄绿素二乙酸酯（FDA）水解活性也较高，在树行土壤采样在秋季，但没有显着差异，土壤采样在夏季。在枫树网站，AWC和基板丰富度显着较高的树行土壤采样在2001年。土壤体积含水量和温度普遍较低，在枫树网站的树行。这项研究的结果表明，功能不同的微生物种群可能存在于山核桃树下相比，种植的小巷，这可能会促进养分供应的差异，需要在这样的小巷种植系统的长期养分管理。
Spatially dependent patterns in microbial properties may exist in temperate alley cropping systems due to differences in litter quality and microclimate in areas under trees compared to those in the alleys. The effect of tree row location was evaluated for its impact on soil enzyme activities and Biolog substrate use patterns. Soils were sampled to a depth of 30 cm at the tree row and at the middle of the alley at two sites: a 21-year-old pecan (Carya illinoinensis)/bluegrass (Poa trivials) intercrop (Pecan site) and a 12-year-old silver maple (Acer saccharinum)/soybean (Glycine max)–maize (Zea mays) rotation (Maple site). Sampling was done in fall 2001 and summer 2002. β-Glucosidase activities, Biolog patterns expressed as average well color (AWC), substrate richness, and Shannon diversity index, and total Kjeldahl nitrogen (TKN) were significantly higher (P<0.05) in the tree row than at the middle of the alley for surface soils at the Pecan site. Fluorescein diacetate (FDA) hydrolytic activity was also higher at the tree row for soils sampled in the fall, but did not differ significantly for soils sampled in the summer. At the Maple site, AWC and substrate richness were significantly higher at the tree row for soils sampled in 2001. Soil volumetric water content and temperature were generally lower in the tree row at the Maple site. The results of this study suggest that functionally different microbial populations may be present under pecan trees compared to cropped alleys which may promote disparities in nutrient availability necessitating differential long-term nutrient management in such alley cropping systems.