Determinants for seasonal change of nematode community composition under long-term application of organic manure in an acid soil in subtropical China
Determinants for seasonal change of nematode community composition under long-term application of organic manure in an acid soil in subtropical China
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中国亚热带酸性土壤长期施用有机肥下线虫群落组成季节变化的决定因素
DOI：
10.1016/j.ejsobi.2012.11.003
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发表时间：
2013-03-01
影响因子：
4.2
通讯作者：
Jiang, Yuji
中科院分区：
文献类型：
--
作者：
Jiang, Chun;Sun, Bo;Jiang, Yuji
通过连续9年的猪粪施肥试验，研究了酸性土壤上土壤线虫群落结构的季节变化。粪肥处理包括：1）不施肥（CK）;（2）施氮量为150 kg·ha（-1）·y（-1）（ON 1）的低施肥量，施氮量为600 kg·ha（-1）·y（-1）（ON 2）的高施肥量，施氮量为600 kg·ha（-1）·y（-1）和Ca（OH）量为3000 kg·ha（-1）·y（-1）（ON 2L）的高施肥量。线虫总数为72 ~ 880条/100 g干土，分属27个属，其数量大小顺序为ON 2> ON 1> ON 2L> CK。线虫丰度最低值出现在玉米收获前的4月，最高值出现在玉米收获前的7月。施用高比例有机肥后的前3个月内，小杆线虫、线虫和原小杆线虫发生演替。线虫通道比和区系分析表明，在高施肥量下，细菌分解扰乱了土壤食物网，而在低施肥量下，真菌分解扰乱了土壤食物网。变异分配分析表明，气候和土壤因子分别解释了线虫群落组成变异的17.3%和24.7%。聚合增强树分析表明，土壤NO3--N和/或NH 4 +-N含量对大多数营养类群的影响最大，除了有效K对噬菌体的影响。土壤因子对线虫群落组成的影响比气候因子更大。(C)2012年Elsevier Masson SAS。All rights reserved.
Seasonal changes in soil nematode community structure were investigated in a 9-year pig manure experiment on an acid soil in subtropical China. The manure treatments included: 1) no manure (CK); 2) low rate with 150 kg N ha(-1) y(-1) (ON1); 3) high rate with 600 kg N ha(-1) y(-1) (ON2); 4) high rate with 600 kg N ha(-1) y(-1) and 3000 kg of Ca(OH)(2) ha(-1) 3 y(-1) (ON2L). The total nematode numbers ranged from 72 to 880 individuals per 100 g dry soil, represented by 27 genera, and followed a decreasing order of ON2 > ON1 > ON2L > CK. The minimum of nematode abundance was observed in April before fertilizing while the maximum in July before maize harvesting. There was a succession from Rhabditidae and Cephalobus to Protorhabditis in the first 3 months after applying high rate manure. Nematode channel ratio and faunal analysis indicated disturbed soil food webs with bacterial decomposition under high rate manure, whereas those with fungal decomposition under low rate manure. Variation partitioning analysis showed the climatic and soil factors independently explained 17.3% and 24.7% of the variation in nematode community composition, respectively. Aggregated boosted trees analysis showed soil NO3--N and/or NH4+-N contents had the strongest effect on most trophic groups, apart from available K on bacterivores. We concluded that soil factors had more important influence on nematode community composition than climatic factors. (C) 2012 Elsevier Masson SAS. All rights reserved.