不同植被恢复方式下红壤线虫数量特征  

Nematode Abundance Under Different Vegetations Restored on Degraded Red Soil

作　　者：李辉信[1] 刘满强[1] 胡锋[1] 陈小云[1] 何圆球[2] 

机构地区：[1]南京农业大学资源与环境学院,南京210095 [2]中国科学院南京土壤研究所,南京210008

出　　处：《生态学报》2002年第11期1882-1889,共8页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目 (4 9871 0 46) ;国家重点基础研究发展规划资助项目 (G1 9990 1 1 80 1 ) ;中国科学院红壤生态开放实验站基金资助项目

摘　　要：退化红壤不同植被恢复方式下土壤线虫数量的顺序为 :保护荒地 >干扰荒地 >马尾松 >小叶栎 >木荷 >混交林(木荷 -马尾松 )。土壤线虫数量的季节波动明显 :春季和冬季较多 ,秋季居中 ,而夏季极显著少于其它季节 (P<0 .0 1 )。就线虫数量季节变异系数所体现的群落稳定性而言 ,马尾松林地的变异系数最高 (P<0 .0 5 ) ,指示其群落最不稳定。线虫数量在土壤剖面中呈明显的垂直梯度分布。在表层土壤 ,线虫数量与代表碳氮和生物活性水平的土壤质量指标 ,如有机碳、全氮、速效氮磷、微生物量、潜在可矿化碳氮、基础呼吸、酶活性等 ,一般呈极显著正相关 (P<0 .0 1 ) ;而与代表土壤物理性质及交换性能的指标 ,如含水量、容重、颗粒组成、速效钾等一般没有相关性。鉴别分析 (CDA)将不同植被下的样地分为 3组 ,自荒 1和自荒 2为 1组 ,小叶栎、木荷和混交林为 1组 ,而马尾松单独为 1组。总之 ,不同植被恢复下线虫数量的分异初步体现了线虫指示红壤质量的潜力。This study was conducted from May 1999 to February 2000 in a long term revegetation experiment established in 1989 in Yujiang County (28°15′30″N, 116°55′30″E ), Jiangxi Province, China. The tested area, characterized by a warm wet spring and a hot dry summer, is a typical subtropical monsoon region with annual temperature of 17 8℃, and precipitation and evaporation of 1700mm and 1359mm, respectively. The soil type in the experimental station is red soil (Ultisol) derived from Quaternary red clay. Soil nematodes were investigated seasonally with four kinds of artificially restored woodlands, including deciduous broadleaf woodland ( Quercus chenii, Qc), evergreen broadleaf woodland ( Schima superba, Ss ), coniferous woodland (Pinus massonina, Pm), and coniferous broadleaf mixed woodland ( Schima superba Pinus massonina, Sm), and two grasslands, i.e. slightly disturbed grassland (G1) and undisturbed grassland (G2). Nematode abundance differentiated distinctly under different vegetations, which was in the order of G2>G1>Pm>Qc>Ss>Sm. Nematodes showed obvious seasonal fluctuations. In general, nematode abundance was relatively high in spring and winter, followed by in autumn, and was lowest in summer. The dual depression of high temperature and low soil moisture was attributable to the sharp decrease of nematode population in summer. Based on variation coefficients of mean abundance, the lowest nematode community stability was found in Pm. Nematode abundance showed clear stratification with depth, which was in the order of 0~5cm>5~10cm>10~20cm. Correlation analysis demonstrated that nematode abundance was highly positively correlated with soil organic C, total N, available N, available P, soil microbial biomass C, soil microbial biomass N, potential mineralizable C, potential mineralizable N, basal respiration, invertase, urease and acid phosphatase in top soil ( P <0 01). However, it had no relationship with soil moisture, bulk density, clay content, sand content and available K. Th

关 键 词：植被恢复方式 红壤 土壤线虫 季节波动 数量特征 

分 类 号：S154.386[农业科学—土壤学] S15[农业科学—农业基础科学]